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The V-1 flying bomb (german:
Vergeltungswaffe V-weapons, known in original German as (, German: "retaliatory weapons", "reprisal weapons"), were a particular set of long-range artillery weapons designed for strategic bombing during World War II, particularly strategic bombing and/or aer ...
1 "Vengeance Weapon 1") was an early
cruise missile A cruise missile is a guided missile used against terrestrial or naval targets that remains in the atmosphere and flies the major portion of its flight path at approximately constant speed. Cruise missiles are designed to deliver a large warhe ...
. Its official
Reich Aviation Ministry The Ministry of Aviation (german: Reichsluftfahrtministerium, abbreviated RLM) was a government department during the period of Nazi Germany (1933–45). It is also the original name of the Detlev-Rohwedder-Haus building on the Wilhelmstrasse ...
() designation was Fi 103. It was also known to the Allies as the buzz bomb or doodlebug and in Germany as (
cherry A cherry is the fruit of many plants of the genus ''Prunus'', and is a fleshy drupe (stone fruit). Commercial cherries are obtained from cultivars of several species, such as the sweet ''Prunus avium'' and the sour ''Prunus cerasus''. The nam ...
stone) or (
maybug The cockchafer, colloquially called Maybug, Maybeetle, or doodlebug, is the name given to any of the European beetles of the genus ''Melolontha'', in the family Scarabaeidae. Once abundant throughout Europe and a major pest in the periodical ye ...
). The V-1 was the first of the (
V-weapons V-weapons, known in original German as (, German: "retaliatory weapons", "reprisal weapons"), were a particular set of long-range artillery weapons designed for strategic bombing during World War II, particularly strategic bombing and/or aer ...
) deployed for the
terror bombing Strategic bombing is a military strategy used in total war with the goal of defeating the enemy by destroying its morale, its economic ability to produce and transport materiel to the theatres of military operations, or both. It is a systematic ...
of London. It was developed at
Peenemünde Army Research Center The Peenemünde Army Research Center (german: Heeresversuchsanstalt Peenemünde, HVP) was founded in 1937 as one of five military proving grounds under the German Army Weapons Office (''Heereswaffenamt''). Several German guided missiles and ...
in 1939 by the at the beginning of the
Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
, and during initial development was known by the
codename A code name, call sign or cryptonym is a Code word (figure of speech), code word or name used, sometimes clandestinely, to refer to another name, word, project, or person. Code names are often used for military purposes, or in espionage. They may ...
"Cherry Stone". Because of its limited range, the thousands of V-1 missiles launched into England were fired from launch facilities along the French (
Pas-de-Calais Pas-de-Calais (, " strait of Calais"; pcd, Pas-Calés; also nl, Nauw van Kales) is a department in northern France named after the French designation of the Strait of Dover, which it borders. It has the most communes of all the departments ...
) and Dutch coasts. The Wehrmacht first launched the V-1s against London on 13 June 1944, one week after (and prompted by) the successful Allied landings in France. At peak, more than one hundred V-1s a day were fired at southeast England, 9,521 in total, decreasing in number as sites were overrun until October 1944, when the last V-1 site in range of Britain was overrun by
Allied An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether or not explicit agreement has been worked out among them. Members of an alliance are called ...
forces. After this, the Germans directed V-1s at the port of
Antwerp Antwerp (; nl, Antwerpen ; french: Anvers ; es, Amberes) is the largest city in Belgium by area at and the capital of Antwerp Province in the Flemish Region. With a population of 520,504,
and at other targets in Belgium, launching a further 2,448 V-1s. The attacks stopped only a month before the war in Europe ended, when the last launch site in the
Low Countries The term Low Countries, also known as the Low Lands ( nl, de Lage Landen, french: les Pays-Bas, lb, déi Niddereg Lännereien) and historically called the Netherlands ( nl, de Nederlanden), Flanders, or Belgica, is a coastal lowland region in N ...
was overrun on 29 March 1945. As part of operations against the V-1, the British operated an arrangement of
air defence Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based, ...
s, including
anti-aircraft gun Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based, ...
s,
barrage balloon A barrage balloon is a large uncrewed tethered balloon used to defend ground targets against aircraft attack, by raising aloft steel cables which pose a severe collision risk to aircraft, making the attacker's approach more difficult. Early barra ...
s, and fighter aircraft, to intercept the bombs before they reached their targets, while the launch sites and underground storage depots became targets for Allied attacks including
strategic bombing Strategic bombing is a military strategy used in total war with the goal of defeating the enemy by destroying its morale, its economic ability to produce and transport materiel to the theatres of military operations, or both. It is a systematica ...
. In 1944, a number of tests of this weapon were conducted in Tornio, Finland. According to multiple soldiers, a small "plane"-like bomb with wings fell off a German plane. Another V-1 was launched which flew over the Finnish soldiers' lines. The second bomb suddenly stopped its engine and fell steeply down, exploding and leaving a crater around 20 to 30 metres wide. The V-1 flying bomb was referred by Finnish soldiers as a "Flying Torpedo" due to its resemblance to one from afar.


Design and development

In 1935, Paul Schmidt and Professor
Georg Hans Madelung Georg Hans Madelung (31 July 1889 in Rostock – 17 August 1972 in Uffing) was a Germans, German academic and aeronautical engineer. Madelung studied at several German Technical University, Technical Universities before his service as a pilot ...
submitted a design to the ''
Luftwaffe The ''Luftwaffe'' () was the aerial-warfare branch of the German ''Wehrmacht'' before and during World War II. Germany's military air arms during World War I, the ''Luftstreitkräfte'' of the Imperial Army and the '' Marine-Fliegerabtei ...
'' for a
flying bomb A flying bomb is a manned or unmanned aerial vehicle or aircraft carrying a large explosive warhead, a precursor to contemporary cruise missiles. In contrast to a bomber aircraft, which is intended to release bombs and then return to its base for ...
. It was an innovative design that used a
pulse-jet 300px, Diagram of a pulsejet A pulsejet engine (or pulse jet) is a type of jet engine in which combustion occurs in pulses. A pulsejet engine can be made with few or no moving parts, and is capable of running statically (i.e. it does not need t ...
engine, while previous work dating back to 1915 by
Sperry Gyroscope Sperry may refer to: Places In the United States: *Sperry, Iowa, community in Des Moines County *Sperry, Missouri *Sperry, Oklahoma, town in Tulsa County *Sperry Chalet, historic backcountry chalet, Glacier National Park, Montana *Sperry Glacier, ...
relied on
propeller A propeller (colloquially often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon ...
s. While employed by the company,
Fritz Gosslau Fritz Gosslau (25 March 1898 – 1 December 1965) was a German engineer, known for his work on the V-1 flying bomb. Study Gosslau was born in Berlin. In 1923, he completed his engineering studies by gaining a diploma from the Technical Univer ...
developed a remote-controlled
target drone A target drone is an unmanned aerial vehicle, generally remote controlled, usually used in the training of anti-aircraft crews. One of the earliest drones was the British DH.82 Queen Bee, a variant of the Tiger Moth trainer aircraft operationa ...
, the FZG 43 (''Flakzielgerat-43''). In October 1939, Argus proposed ''Fernfeuer'', a remote-controlled aircraft carrying a payload of one ton, that could return to base after releasing its bomb. Argus worked in co-operation with
C. Lorenz AG C. Lorenz AG (1880–1958) was a German electrical and electronics firm primarily located in Berlin. It innovated, developed, and marketed products for electric lighting, telegraphy, telephony, radar, and radio. It was acquired by ITT in 1930 and ...
and
Arado Flugzeugwerke Arado Flugzeugwerke was a German aircraft manufacturer, originally established as the Warnemünde factory of the Flugzeugbau Friedrichshafen firm, that produced land-based military aircraft and seaplanes during the First and Second World Wars. Hi ...
to develop the project. However, once again, the ''Luftwaffe'' declined to award a development contract. In 1940, Schmidt and Argus began cooperating, integrating Schmidt's shutter system with Argus'
atomized Atomization refers to breaking bonds in some substance to obtain its constituent atoms in gas phase. By extension, it also means separating something into fine particles, for example: process of breaking bulk liquids into small droplets. Atomizati ...
fuel injection Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All comp ...
. Tests began in January 1941, and the first flight made on 30 April 1941 with a
Gotha Go 145 The Gotha Go 145 is a German World War II-era biplane of wood and fabric construction used by ''Luftwaffe'' training units. Although obsolete by the start of World War II, the Go 145 remained in operational service until the end of the War in Eu ...
. On 27 February 1942, Gosslau and
Robert Lusser Robert Lusser (19 April 1899 – 19 January 1969) was a German engineer, aircraft designer and aviator. He is remembered both for several well-known Messerschmitt and Heinkel designs during World War II, and after the war for his theoretical study o ...
sketched out the design of an aircraft with the pulse-jet above the tail, the basis for the future V-1. Lusser produced a preliminary design in April 1942, P35 Efurt, which used
gyroscope A gyroscope (from Ancient Greek γῦρος ''gŷros'', "round" and σκοπέω ''skopéō'', "to look") is a device used for measuring or maintaining orientation and angular velocity. It is a spinning wheel or disc in which the axis of rota ...
s. When submitted to the ''Luftwaffe'' on 5 June 1942, the specifications included a range of , a speed of , and capable of delivering a
warhead A warhead is the forward section of a device that contains the explosive agent or toxic (biological, chemical, or nuclear) material that is delivered by a missile, rocket, torpedo, or bomb. Classification Types of warheads include: * Explosiv ...
. Project
Fieseler The Gerhard Fieseler Werke (GFW) in Kassel was a German aircraft manufacturer of the 1930s and 1940s. The company is remembered mostly for its military aircraft built for the Luftwaffe during the Second World War. History The firm was founded on ...
Fi 103 was approved on 19 June, and assigned
code name A code name, call sign or cryptonym is a code word or name used, sometimes clandestinely, to refer to another name, word, project, or person. Code names are often used for military purposes, or in espionage. They may also be used in industrial c ...
''Kirschkern'' and
cover name A front organization is any entity set up by and controlled by another organization, such as intelligence agencies, organized crime groups, terrorist organizations, secret societies, banned organizations, religious or political groups, advocacy gro ...
''Flakzielgerat'' 76 (FZG-76). Flight tests were conducted at the ''Luftwaffes coastal test centre at
Karlshagen Karlshagen is a Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden and the North and Central European Plain. The sea stretches from 53 ...
, Peenemünde-West. Milch awarded Argus the contract for the engine, Fieseler the
airframe The mechanical structure of an aircraft is known as the airframe. This structure is typically considered to include the fuselage, undercarriage, empennage and wings, and excludes the propulsion system. Airframe design is a field of aerospa ...
, and Askania the
guidance system A guidance system is a virtual or physical device, or a group of devices implementing a controlling the movement of a ship, aircraft, missile, rocket, satellite, or any other moving object. Guidance is the process of calculating the changes in po ...
. By 30 August, Fieseler had completed the first
fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...
, and the first flight of the Fi 103 V7 took place on 10 December 1942, when it was airdropped by a
Fw 200 The Focke-Wulf Fw 200 ''Condor'', also known as ''Kurier'' to the Allies (English: Courier), was a German all-metal four-engined monoplane originally developed by Focke-Wulf as a long-range airliner. A Japanese request for a long-range maritime p ...
. Then on Christmas Eve, the V-1 flew , for about a minute, after a ground launch. On 26 May 1943, Germany decided to put both the V-1 and the V-2 into production. In July 1943, the V-1 flew 245 kilometres and impacted within a kilometre of its target. The V-1 was named by '' Das Reich'' journalist Hans Schwarz Van Berkl in June 1944 with Hitler's approval.


Description

The V-1 was designed under the codename (cherry stone) by Lusser and Gosslau, with a
fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...
constructed mainly of welded
sheet steel Sheet metal is metal formed into thin, flat pieces, usually by an industrial process. Sheet metal is one of the fundamental forms used in metalworking, and it can be cut and bent into a variety of shapes. Thicknesses can vary significantly; ex ...
and wings built of
plywood Plywood is a material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. It is an engineered wood from the family of manufactured ...
. The simple, Argus-built pulsejet engine pulsed 50 times per second, and the characteristic buzzing sound gave rise to the colloquial names "buzz bomb" or "doodlebug" (a common name for a wide variety of flying insects). It was known briefly in Germany (on Hitler's orders) as (
May bug The cockchafer, colloquially called Maybug, Maybeetle, or doodlebug, is the name given to any of the European beetles of the genus ''Melolontha'', in the family Scarabaeidae. Once abundant throughout Europe and a major pest in the periodical ye ...
) and (crow).


Power plant

The Argus
pulsejet 300px, Diagram of a pulsejet A pulsejet engine (or pulse jet) is a type of jet engine in which combustion occurs in pulses. A pulsejet engine can be made with few or no moving parts, and is capable of running statically (i.e. it does not need ...
's major components included the
nacelle A nacelle ( ) is a "streamlined body, sized according to what it contains", such as an engine, fuel, or equipment on an aircraft. When attached by a pylon entirely outside the airframe, it is sometimes called a pod, in which case it is attached ...
, fuel jets, flap valve grid, mixing chamber venturi, tail pipe, and spark plug. Compressed air rather than a
fuel pump A fuel pump is a component in motor vehicles that transfers liquid from the fuel tank to the carburetor or fuel injector of the internal combustion engine. Carbureted engines often use low pressure mechanical pumps that are mounted outside the f ...
forced gasoline from the fuel tank through the fuel jets which consisted of three banks of three atomizers. These nine atomizing nozzles were in front of the air inlet valve system where it mixed with air before entering the chamber. A
throttle valve A throttle is the mechanism by which fluid flow is managed by constriction or obstruction. An engine's power can be increased or decreased by the restriction of inlet gases (by the use of a throttle), but usually decreased. The term ''throttle'' ...
, connected to altitude and ram pressure instruments, controlled fuel flow. Schmidt's spring-controlled flap valve system provided an efficient straight path for incoming air. The flaps momentarily closed after each explosion, the resultant gas compressed in the venturi chamber, and its tapered portion accelerated the exhaust gases creating
thrust Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction to be applied to that syst ...
. The operation proceeded at a rate of 42 cycles per second. Beginning in January 1941, the V-1's pulsejet engine was also tested on a variety of craft, including automobiles and an experimental
attack boat A fast attack craft (FAC) is a small, fast, agile, offensive, often affordable warship armed with anti-ship missiles, gun or torpedoes. FACs are usually operated in close proximity to land as they lack both the seakeeping and all-round defensiv ...
known as the Tornado. The unsuccessful prototype was a version of a , in which a boat loaded with explosives was steered towards a target ship and the pilot would leap out of the back at the last moment. The Tornado was assembled from surplus
seaplane A seaplane is a powered fixed-wing aircraft capable of takeoff, taking off and water landing, landing (alighting) on water.Gunston, "The Cambridge Aerospace Dictionary", 2009. Seaplanes are usually divided into two categories based on their tec ...
hulls connected in
catamaran A Formula 16 beachable catamaran Powered catamaran passenger ferry at Salem, Massachusetts, United States A catamaran () (informally, a "cat") is a multi-hulled watercraft featuring two parallel hulls of equal size. It is a geometry-stab ...
fashion with a small pilot cabin on the crossbeams. The Tornado prototype was a noisy underperformer and was abandoned in favour of more conventional
piston-engine A reciprocating engine, also often known as a piston engine, is typically a heat engine that uses one or more reciprocating pistons to convert high temperature and high pressure into a rotating motion. This article describes the common featu ...
craft. The engine made its first flight aboard a
Gotha Go 145 The Gotha Go 145 is a German World War II-era biplane of wood and fabric construction used by ''Luftwaffe'' training units. Although obsolete by the start of World War II, the Go 145 remained in operational service until the end of the War in Eu ...
on 30 April 1941.


Guidance system

The V-1
guidance system A guidance system is a virtual or physical device, or a group of devices implementing a controlling the movement of a ship, aircraft, missile, rocket, satellite, or any other moving object. Guidance is the process of calculating the changes in po ...
used a simple
autopilot An autopilot is a system used to control the path of an aircraft, marine craft or spacecraft without requiring constant manual control by a human operator. Autopilots do not replace human operators. Instead, the autopilot assists the operator' ...
developed by
Askania A cinetheodolite (a.k.a. ''kinetheodolite'') is a photographic instrument for collection of trajectory data. It can be used to acquire data in the testing of missiles, rockets, projectiles, aircraft, and fire control systems; in the ripple firin ...
in Berlin to regulate altitude and airspeed. A pair of gyroscopes controlled yaw and pitch, while azimuth was maintained by a magnetic compass. Altitude was maintained by a barometric device. Two spherical tanks contained
compressed air Compressed air is air kept under a pressure that is greater than atmospheric pressure. Compressed air is an important medium for transfer of energy in industrial processes, and is used for power tools such as air hammers, drills, wrenches, and o ...
at , that drove the gyros, operated the
pneumatic Pneumatics (from Greek ‘wind, breath’) is a branch of engineering that makes use of gas or pressurized air. Pneumatic systems used in Industrial sector, industry are commonly powered by compressed air or compressed inert gases. A central ...
servo-motors controlling the rudder and elevator, and pressurized the fuel system. The magnetic compass was located near the front of the V1, within a wooden sphere. Just before launch, the V1 was suspended inside the Compass Swinging Building (Richthaus). There the compass was corrected for
magnetic variance Magnetic declination, or magnetic variation, is the angle on the horizontal plane between magnetic north (the direction the north end of a magnetized compass needle points, corresponding to the direction of the Earth's magnetic field lines) and ...
and
magnetic deviation Magnetic deviation is the error induced in a compass by ''local'' magnetic fields, which must be allowed for, along with magnetic declination, if accurate bearings are to be calculated. (More loosely, "magnetic deviation" is used by some to mean ...
. The RLM at first planned to use a
radio control Radio control (often abbreviated to RC) is the use of control signals transmitted by radio to remotely control a device. Examples of simple radio control systems are garage door openers and keyless entry systems for vehicles, in which a small ...
system with the V-1 for precision attacks, but the government decided instead to use the missile against London. Some flying bombs were equipped with a basic radio transmitter operating in the range of 340–450 kHz. Once over the channel, the radio would be switched on by the vane counter, and a aerial deployed. A coded Morse signal, unique to each V1 site, transmitted the route, and impact zone calculated once the radio stopped transmitting. An odometer driven by a
vane anemometer In meteorology, an anemometer () is a device that measures wind speed and direction. It is a common instrument used in weather stations. The earliest known description of an anemometer was by Italian architect and author Leon Battista Alberti ( ...
on the nose determined when the target area had been reached, accurate enough for
area bombing In military aviation, area bombardment (or area bombing) is a type of aerial bombardment in which bombs are dropped over the general area of a target. The term "area bombing" came into prominence during World War II. Area bombing is a form of str ...
. Before launch, it was set to count backwards from a value that would reach zero upon arrival at the target in the prevailing wind conditions. As the missile flew, the airflow turned the propeller, and every 30 rotations of the propeller counted down one number on the odometer. This odometer triggered the arming of the warhead after about . When the count reached zero, two detonating bolts were fired. Two spoilers on the
elevator An elevator or lift is a wire rope, cable-assisted, hydraulic cylinder-assisted, or roller-track assisted machine that vertically transports people or freight between floors, levels, or deck (building), decks of a building, watercraft, ...
were released, the linkage between the elevator and servo was jammed, and a
guillotine A guillotine is an apparatus designed for efficiently carrying out executions by beheading. The device consists of a tall, upright frame with a weighted and angled blade suspended at the top. The condemned person is secured with stocks at th ...
device cut off the control hoses to the rudder servo, setting the rudder in neutral. These actions put the V-1 into a steep dive. While this was originally intended to be a power dive, in practice the dive caused the fuel flow to cease, which stopped the engine. The sudden silence after the buzzing alerted listeners of the impending impact. Initially, V-1s landed within a circle in diameter, but by the end of the war, accuracy had been improved to about , which was comparable to the
V-2 rocket The V-2 (german: Vergeltungswaffe 2, lit=Retaliation Weapon 2), with the technical name ''Aggregat 4'' (A-4), was the world’s first long-range guided ballistic missile. The missile, powered by a liquid-propellant rocket engine, was developed ...
.


Warhead

The warhead consisted of 850 kg of
Amatol Amatol is a highly explosive material made from a mixture of TNT and ammonium nitrate. The British name originates from the words ammonium and toluene (the precursor of TNT). Similar mixtures (one part dinitronaphthalene and seven parts ammoniu ...
, 52A+ high-grade blast-effective explosive with three fuses. An electrical fuse could be triggered by nose or belly impact. Another fuse was a slow-acting mechanical fuse allowing deeper penetration into the ground, regardless of the altitude. The third fuse was a delayed action fuse, set to go off two hours after launch. The purpose of the third fuse was to avoid the risk of this secret weapon being examined by the British. Its time delay was too short to be a useful booby trap, but was instead meant to destroy the weapon if a soft landing had not triggered the impact fuses. These fusing systems were very reliable, and almost no dud V-1s were recovered.


Walter catapult

Ground-launched V-1s were propelled up an inclined launch ramp by an apparatus known as a ("steam generator"), in which steam was generated when
hydrogen peroxide Hydrogen peroxide is a chemical compound with the formula . In its pure form, it is a very pale blue liquid that is slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution (3% ...
(
T-Stoff T-Stoff (; 'substance T') was a stabilised high test peroxide used in Germany during World War II. T-Stoff was specified to contain 80% (occasionally 85%) hydrogen peroxide (H2O2), remainder water, with traces (<0.1%) of stabilisers. Stabilisers ...
) was mixed with
sodium permanganate Sodium permanganate is the inorganic compound with the formula Na MnO4. It is closely related to the more commonly encountered potassium permanganate, but it is generally less desirable, because it is more expensive to produce. It is mainly avai ...
(
Z-Stoff Z-Stoff (, "substance Z") was a name for calcium permanganate or sodium permanganate mixed in water. It was normally used as a catalyst for T-Stoff (high-test peroxide) in military rocket programs by Nazi Germany during World War II. Z-Stoff was u ...
). Designed by
Hellmuth Walter Kommanditgesellschaft Hellmuth Walter Kommanditgesellschaft (HWK), Helmuth Walter Werke (HWM), or commonly known as the Walter-Werke, was a German company founded by Professor Hellmuth Walter to pursue his interest in engines using hydrogen peroxide as a fuel. Having ex ...
, the WR 2.3 Schlitzrohrschleuder consisted of a small gas generator trailer, where the T-Stoff and Z-Stoff combined, generating high-pressure steam that was fed into a tube within the launch rail box. A piston in the tube, connected underneath the missile, was propelled forward by the steam. It is a common misconception that this was done to allow the engine to start running but this is not true. It was done because the Argus didn't have enough power to propel the V1 to a speed over its incredibly high stall speed. The launch rail was long, consisting of 8 modular sections, each long, and a muzzle brake. Production of the Walter catapult began in January 1944. The Walter catapult accelerated the V-1 to a launch speed of , well above the needed minimum operational speed of . The V-1 made British landfall at , but accelerated to over London, as its of fuel burned off. On 18 June 1943,
Hermann Göring Hermann Wilhelm Göring (or Goering; ; 12 January 1893 – 15 October 1946) was a German politician, military leader and convicted war criminal. He was one of the most powerful figures in the Nazi Party, which ruled Germany from 1933 to 1 ...
decided on launching the V-1, using the Walter catapult, in both large launch bunkers, called Wasserwerk, and lighter installations, called the Stellungsystem. The Wasserwerk bunker measured long, wide, and high. Four were initially to be built: Wasserwerk Desvres, Wasserwerk St. Pol, Wasserwerk Valognes, and Wasserwerk Cherbourg. Stellungsystem-I was to be operated by Flak Regiment 155(W), with 4 launch battalions, each having 4 launchers, and located in the
Pas-de-Calais Pas-de-Calais (, " strait of Calais"; pcd, Pas-Calés; also nl, Nauw van Kales) is a department in northern France named after the French designation of the Strait of Dover, which it borders. It has the most communes of all the departments ...
region. Stellungsystem-II, with 32 sites, was to act as a reserve unit. Stellungsystem-I and II had nine batteries manned by February 1944. Stellungsystem-III, operated by FR 255(W), was to be organized in the spring of 1944, and located between
Rouen Rouen (, ; or ) is a city on the River Seine in northern France. It is the prefecture of the Regions of France, region of Normandy (administrative region), Normandy and the Departments of France, department of Seine-Maritime. Formerly one of ...
and
Caen Caen (, ; nrf, Kaem) is a commune in northwestern France. It is the prefecture of the department of Calvados. The city proper has 105,512 inhabitants (), while its functional urban area has 470,000,Oberst ''Oberst'' () is a senior field officer rank in several German-speaking and Scandinavian countries, equivalent to colonel. It is currently used by both the ground and air forces of Austria, Germany, Switzerland, Denmark, and Norway. The Swedish ...
Schmalschläger had developed a more simplified launching site, called Einsatz Stellungen. Less conspicuous, 80 launch sites and 16 support sites were located from
Calais Calais ( , , traditionally , ) is a port city in the Pas-de-Calais department, of which it is a subprefecture. Although Calais is by far the largest city in Pas-de-Calais, the department's prefecture is its third-largest city of Arras. Th ...
to
Normandy Normandy (; french: link=no, Normandie ; nrf, Normaundie, Nouormandie ; from Old French , plural of ''Normant'', originally from the word for "northman" in several Scandinavian languages) is a geographical and cultural region in Northwestern ...
. Each site took only 2 weeks to construct, using 40 men, and the Walter catapult only took 7–8 days to erect, when the time was ready to make it operational. Once near the launch ramp, the wing spar and wings were attached and the missile was slid off the loading trolley, Zubringerwagen, onto the launch ramp. The ramp catapult was powered by the Dampferzeuger trolley. The pulse-jet engine was started by the Anlassgerät, which provided compressed air for the engine intake, and electrical connection to the engine
spark plug A spark plug (sometimes, in British English, a sparking plug, and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air ...
, and autopilot. The Bosch spark plug was only needed to start the engine, while residual flame ignited further mixtures of gasoline and air, and the engine would be at full power after 7 seconds. The catapult would then accelerate the bomb above its stall speed of , and ensuring sufficient ram air.


Operation Eisbär

Mass production of the FZG-76 did not start until the spring of 1944, and FR 155(W) was not equipped until late May 1944. Operation Eisbär, the missile attacks on London, commenced on 12 June. However, the four launch battalions could only operate from the Pas-de-Calais area, amounting to only 72 launchers. They had been supplied with missiles, Walter catapults, fuel, and other associated equipment since
D-Day The Normandy landings were the landing operations and associated airborne operations on Tuesday, 6 June 1944 of the Allied invasion of Normandy in Operation Overlord during World War II. Codenamed Operation Neptune and often referred to as D ...
. None of the nine missiles launched on the 12th reached England, while only four did so on the 13th. The next attempt to start the attack occurred on the night of 15/16 June, when 144 missiles reached England, of which 73 struck London, while 53 struck
Portsmouth Portsmouth ( ) is a port and city in the ceremonial county of Hampshire in southern England. The city of Portsmouth has been a unitary authority since 1 April 1997 and is administered by Portsmouth City Council. Portsmouth is the most dens ...
and
Southampton Southampton () is a port city in the ceremonial county of Hampshire in southern England. It is located approximately south-west of London and west of Portsmouth. The city forms part of the South Hampshire built-up area, which also covers Po ...
. Damage was widespread and
Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; ; October 14, 1890 – March 28, 1969) was an American military officer and statesman who served as the 34th president of the United States from 1953 to 1961. During World War II, ...
ordered attacks on the V-1 sites as a priority.
Operation Cobra Operation Cobra was the codename for an Offensive (military), offensive launched by the United States First United States Army, First Army under Lieutenant General Omar Bradley seven weeks after the D-Day landings, during the Invasion of Norman ...
forced a retreat from the French launch sites in August, with the last battalion leaving on 29 August. Operation Donnerschlag began from Germany on 21 October 1944.


Operation and effectiveness

The first complete V-1 airframe was delivered on 30 August 1942, and after the first complete As.109-014 was delivered in September, the first glide test flight was on 28 October 1942 at
Peenemünde Peenemünde (, en, "Peene iverMouth") is a municipality on the Baltic Sea island of Usedom in the Vorpommern-Greifswald district in Mecklenburg-Vorpommern, Germany. It is part of the ''Amt'' (collective municipality) of Usedom-Nord. The communi ...
, from under a Focke-Wulf Fw 200. The first powered trial was on 10 December, launched from beneath an He 111. The LXV ''Armeekorps z.b.V.'' ("65th Army Corps for special deployment) formed during the last days of November 1943 in France commanded by ''General der Artillerie z.V.''
Erich Heinemann The given name Eric, Erich, Erikk, Erik, Erick, or Eirik is derived from the Old Norse name ''Eiríkr'' (or ''Eríkr'' in Old East Norse due to monophthongization). The first element, ''ei-'' may be derived from the older Proto-Norse ''* ain ...
was responsible for the operational use of V-1. The conventional launch sites could theoretically launch about 15 V-1s per day, but this rate was difficult to achieve on a consistent basis; the maximum rate achieved was 18. Overall, only about 25% of the V-1s hit their targets, the majority being lost because of a combination of defensive measures, mechanical unreliability or guidance errors. With the capture or destruction of the launch facilities used to attack England, the V-1s were employed in attacks against strategic points in Belgium, primarily the port of
Antwerp Antwerp (; nl, Antwerpen ; french: Anvers ; es, Amberes) is the largest city in Belgium by area at and the capital of Antwerp Province in the Flemish Region. With a population of 520,504,
. Launches against Britain were met by a variety of countermeasures, including
barrage balloon A barrage balloon is a large uncrewed tethered balloon used to defend ground targets against aircraft attack, by raising aloft steel cables which pose a severe collision risk to aircraft, making the attacker's approach more difficult. Early barra ...
s and aircraft such as the
Hawker Tempest The Hawker Tempest is a British fighter aircraft that was primarily used by the Royal Air Force (RAF) in the Second World War. The Tempest, originally known as the ''Typhoon II'', was an improved derivative of the Hawker Typhoon, intended to ...
and newly introduced jet
Gloster Meteor The Gloster Meteor was the first British jet fighter and the Allies of World War II, Allies' only jet aircraft to engage in combat operations during the Second World War. The Meteor's development was heavily reliant on its ground-breaking turb ...
. These measures were so successful that by August 1944 about 80% of V-1s were being destroyed (Although the Meteors were fast enough to catch the V-1s, they suffered from frequent cannon failures, and accounted for only 13.) In all, about 1,000 V-1s were destroyed by aircraft. The intended operational altitude was originally set at . However, repeated failures of a barometric fuel-pressure regulator led to it being changed in May 1944, halving the operational height, thereby bringing V-1s into range of the 40mm Bofors light anti-aircraft guns commonly used by Allied AA units. The trial versions of the V-1 were air-launched. Most operational V-1s were launched from static sites on land, but from July 1944 to January 1945, the launched approximately 1,176 from modified
Heinkel He 111 The Heinkel He 111 is a German airliner and bomber designed by Siegfried and Walter Günter at Heinkel Flugzeugwerke in 1934. Through development, it was described as a "wolf in sheep's clothing". Due to restrictions placed on Germany after th ...
H-22s of the 's ''
Kampfgeschwader 3 ''Kampfgeschwader'' 3 "Blitz" (KG 3) was a Luftwaffe bomber wing during World War II . KG 3 was created in 1939 as the Luftwaffe reorganised and expanded to meet Adolf Hitler's rearmament demands. It was founded in May 1939 and by December 1939, ...
'' (3rd Bomber Wing, the so-called "Blitz Wing") flying over the
North Sea The North Sea lies between Great Britain, Norway, Denmark, Germany, the Netherlands and Belgium. An epeiric sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian S ...
. Apart from the obvious motive of permitting the bombardment campaign to continue after static ground sites on the French coast were lost, air launching gave the the opportunity to outflank the increasingly effective ground and air defences put up by the British against the missile. To minimise the associated risks (primarily radar detection), the aircrews developed a tactic called "lo-hi-lo": the He 111s would, upon leaving their airbases and crossing the coast, descend to an exceptionally low altitude. When the launch point was neared, the bombers would swiftly ascend, fire their V-1s, and then rapidly descend again to the previous "wave-top" level for the return flight. Research after the war estimated a 40% failure rate of air-launched V-1s, and the He 111s used in this role were vulnerable to night-fighter attack, as the launch lit up the area around the aircraft for several seconds. The combat potential of air-launched V-1s dwindled during 1944 at about the same rate as that of the ground-launched missiles, as the British gradually took the measure of the weapon and developed increasingly effective defence tactics.


Experimental, piloted, and long-range variants


Piloted variant

Late in the war, several air-launched piloted V-1s, known as , were built, but these were never used in combat.
Hanna Reitsch Hanna Reitsch (29 March 1912 – 24 August 1979) was a German aviator and test pilot. Along with Melitta von Stauffenberg, she flight tested many of Germany's new aircraft during World War II and received many honors. Reitsch was amon ...
made some flights in the modified V-1 Fieseler when she was asked to find out why test pilots were unable to land it and had died as a result. She discovered, after simulated landing attempts at high altitude, where there was air space to recover, that the craft had an extremely high
stall speed In fluid dynamics, a stall is a reduction in the lift coefficient generated by a foil as angle of attack increases.Crane, Dale: ''Dictionary of Aeronautical Terms, third edition'', p. 486. Aviation Supplies & Academics, 1997. This occurs when the ...
, and the previous pilots with little high-speed experience had attempted their approaches much too slowly. Her recommendation of much higher landing speeds was then introduced in training new volunteer pilots. The s were air-launched rather than fired from a catapult ramp, as erroneously portrayed in the film ''
Operation Crossbow ''Crossbow'' was the code name in World War II for Anglo-American operations against the German V-weapons, long range reprisal weapons (V-weapons) programme. The main V-weapons were the V-1 flying bomb and V-2 rocket – these were launched aga ...
''.


Air launch by Ar 234

There were plans, not put into practice, to use the
Arado Ar 234 The Arado Ar 234 ''Blitz'' (English: lightning) is a jet-powered bomber designed and produced by the German aircraft manufacturer Arado. It was the world's first operational turbojet-powered bomber, seeing service during the latter half of the ...
jet bomber to launch V-1s either by towing them aloft or by launching them from a "piggy back" position (in the manner of the , but in reverse) atop the aircraft. In the latter configuration, a pilot-controlled, hydraulically operated dorsal trapeze mechanism would elevate the missile on the trapeze's launch cradle about clear of the 234's upper fuselage. This was necessary to avoid damaging the mother craft's fuselage and tail surfaces when the pulsejet ignited, as well as to ensure a "clean" airflow for the Argus motor's intake. A somewhat less ambitious project undertaken was the adaptation of the missile as a "flying fuel tank" for the
Messerschmitt Me 262 The Messerschmitt Me 262, nicknamed ''Schwalbe'' (German: "Swallow") in fighter versions, or ''Sturmvogel'' (German: "Storm Bird") in fighter-bomber versions, is a fighter aircraft and fighter-bomber that was designed and produced by the Germa ...
jet fighter, which was initially test-towed behind an He 177A Greif bomber. The pulsejet, internal systems and warhead of the missile were removed, leaving only the wings and basic fuselage, now containing a single large fuel tank. A small cylindrical module, similar in shape to a finless dart, was placed atop the vertical stabiliser at the rear of the tank, acting as a centre of gravity balance and attachment point for a variety of equipment sets. A rigid towbar with a pitch pivot at the forward end connected the flying tank to the Me 262. The operational procedure for this unusual configuration saw the tank resting on a wheeled trolley for take-off. The trolley was dropped once the combination was airborne, and explosive bolts separated the towbar from the fighter upon exhaustion of the tank's fuel supply. A number of test flights were conducted in 1944 with this set-up, but inflight "porpoising" of the tank, with the instability transferred to the fighter, meant that the system was too unreliable to be used. An identical utilisation of the V-1 flying tank for the Ar 234 bomber was also investigated, with the same conclusions reached. Some of the "flying fuel tanks" used in trials utilised a cumbersome fixed and spatted undercarriage arrangement, which (along with being pointless) merely increased the drag and stability problems already inherent in the design.


F-1 version

One variant of the basic Fi 103 design did see operational use. The progressive loss of French launch sites as 1944 proceeded and the area of territory under German control shrank meant that soon the V-1 would lack the range to hit targets in England. Air launching was one alternative utilised, but the most obvious solution was to extend the missile's range. Thus the F-1 version developed. The weapon's fuel tank was increased in size, with a corresponding reduction in the capacity of the warhead. Additionally, the nose cones and wings of the F-1 models were made of wood, affording a considerable weight saving. With these modifications, the V-1 could be fired at London and nearby urban centres from prospective ground sites in the Netherlands. Frantic efforts were made to construct a sufficient number of F-1s in order to allow a large-scale bombardment campaign to coincide with the
Ardennes Offensive The Battle of the Bulge, also known as the Ardennes Offensive, was the last major German offensive campaign on the Western Front during World War II. The battle lasted from 16 December 1944 to 28 January 1945, towards the end of the war in ...
, but numerous factors (bombing of the factories producing the missiles, shortages of steel and rail transport, the chaotic tactical situation Germany was facing at this point in the war, etc.) delayed the delivery of these long-range V-1s until February/March 1945. Beginning on 2 March 1945, slightly more than three weeks before the V-1 campaign finally ended, several hundred F-1s were launched at Britain from Dutch sites under Operation "Zeppelin". Frustrated by increasing Allied dominance in the air, Germany also employed V-1s to attack the RAF's forward airfields, such as Volkel, in the Netherlands.


FZG-76 version

There was also a
turbojet The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and ...
-propelled upgraded variant proposed, meant to use the Porsche 109-005 low-cost turbojet engine with about thrust.


Success of operations

Almost 30,000 V-1s were made; by March 1944, they were each produced in 350 hours (including 120 for the autopilot), at a cost of just 4% of a
V-2 The V-2 (german: Vergeltungswaffe 2, lit=Retaliation Weapon 2), with the technical name ''Aggregat 4'' (A-4), was the world’s first long-range guided ballistic missile. The missile, powered by a liquid-propellant rocket engine, was develope ...
, which delivered a comparable payload. Approximately 10,000 were fired at England; 2,419 reached London, killing about 6,184 people and injuring 17,981. The greatest density of hits was received by
Croydon Croydon is a large town in south London, England, south of Charing Cross. Part of the London Borough of Croydon, a local government district of Greater London. It is one of the largest commercial districts in Greater London, with an extensi ...
, on the south-east fringe of London.
Antwerp Antwerp (; nl, Antwerpen ; french: Anvers ; es, Amberes) is the largest city in Belgium by area at and the capital of Antwerp Province in the Flemish Region. With a population of 520,504,
, Belgium was hit by 2,448 V-1s from October 1944 to March 1945.


Intelligence reports

The codename " 76"—"
Flak Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based, ...
target apparatus" helped to hide the nature of the device, and some time passed before references to FZG 76 were linked to the V-83 pilotless aircraft (an experimental V-1) that had crashed on
Bornholm Bornholm () is a Danish island in the Baltic Sea, to the east of the rest of Denmark, south of Sweden, northeast of Germany and north of Poland. Strategically located, Bornholm has been fought over for centuries. It has usually been ruled by ...
in the Baltic and to reports from agents of a flying bomb capable of being used against London. Importantly, the
Luxembourgish Resistance When Luxembourg was invaded and annexed by Nazi Germany in 1940, a national consciousness started to come about. From 1941 onwards, the first resistance groups, such as the '' Letzeburger Ro'de Lé'w'' or the ''PI-Men'', were founded. Operating un ...
, as well as the Polish
Home Army The Home Army ( pl, Armia Krajowa, abbreviated AK; ) was the dominant resistance movement in German-occupied Poland during World War II. The Home Army was formed in February 1942 from the earlier Związek Walki Zbrojnej (Armed Resistance) esta ...
intelligence contributed information on V-1 construction and a place of development (Peenemünde). Initially, British experts were sceptical of the V-1 because they had considered only
solid-fuel rocket A solid-propellant rocket or solid rocket is a rocket with a rocket engine that uses solid propellants ( fuel/oxidizer). The earliest rockets were solid-fuel rockets powered by gunpowder; they were used in warfare by the Arabs, Chinese, Persian ...
s, which could not attain the stated range of . However, they later considered other types of engine, and by the time German scientists had achieved the needed accuracy to deploy the V-1 as a weapon, British intelligence had a very accurate assessment of it.


Countermeasures in England


Anti-aircraft guns

The British defence against German long-range weapons was known by the codename Crossbow with
Operation Diver Operation Diver was the British codename for countermeasures against the V-1 flying bomb campaign launched by the German in 1944 against London and other parts of Britain. Diver was the codename for the V-1, against which the defence consisted of ...
covering countermeasures to the V-1.
Anti-aircraft Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based, ...
guns of the Royal Artillery and
RAF Regiment The Royal Air Force Regiment (RAF Regiment) is part of the Royal Air Force and functions as a specialist corps. Founded by royal warrant in 1942, the Corps carries out soldiering tasks relating to the delivery of air power. Examples of such ta ...
redeployed in several movements: first in mid-June 1944 from positions on the
North Downs The North Downs are a ridge of chalk hills in south east England that stretch from Farnham in Surrey to the White Cliffs of Dover in Kent. Much of the North Downs comprises two Areas of Outstanding Natural Beauty (AONBs): the Surrey Hills and ...
to the south coast of England, then a cordon closing the
Thames Estuary The Thames Estuary is where the River Thames meets the waters of the North Sea, in the south-east of Great Britain. Limits An estuary can be defined according to different criteria (e.g. tidal, geographical, navigational or in terms of salini ...
to attacks from the east. In September 1944, a new linear defence line was formed on the coast of
East Anglia East Anglia is an area in the East of England, often defined as including the counties of Norfolk, Suffolk and Cambridgeshire. The name derives from the Anglo-Saxon kingdom of the East Angles, a people whose name originated in Anglia, in ...
, and finally in December there was a further layout along the
Lincolnshire Lincolnshire (abbreviated Lincs.) is a county in the East Midlands of England, with a long coastline on the North Sea to the east. It borders Norfolk to the south-east, Cambridgeshire to the south, Rutland to the south-west, Leicestershire ...
Yorkshire Yorkshire ( ; abbreviated Yorks), formally known as the County of York, is a Historic counties of England, historic county in northern England and by far the largest in the United Kingdom. Because of its large area in comparison with other Eng ...
coast. The deployments were prompted by changes to the approach tracks of the V-1 as launch sites were overrun by the Allies' advance. On the first night of sustained bombardment, the anti-aircraft crews around Croydon were jubilant—suddenly they were downing unprecedented numbers of German bombers; most of their targets burst into flames and fell when their engines cut out. There was great disappointment when the truth was announced. Anti-aircraft gunners soon found that such small fast-moving targets were, in fact, very difficult to hit. The cruising altitude of the V-1, between meant that anti-aircraft guns could not traverse fast enough to hit the missile. The altitude and speed were more than the rate of traverse of the standard British QF 3.7-inch mobile gun could cope with. The static version of the QF 3.7-inch, designed for use on a permanent, concrete platform, had a faster traverse. The cost and delay of installing new permanent platforms for the guns was fortunately found to be unnecessary, a temporary platform devised by the
Royal Electrical and Mechanical Engineers The Corps of Royal Electrical and Mechanical Engineers (REME ) is a corps of the British Army that maintains the equipment that the Army uses. The corps is described as the "British Army's Professional Engineers". History Prior to REME's for ...
and made from railway sleepers and rails was found to be adequate for the static guns, making them considerably easier to re-deploy as the V-1 threat changed. The development of the
proximity fuze A proximity fuze (or fuse) is a Fuze (munitions), fuze that detonates an Explosive material, explosive device automatically when the distance to the target becomes smaller than a predetermined value. Proximity fuzes are designed for targets such ...
and of centimetric, 3 
gigahertz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one h ...
frequency gun-laying radars based on the
cavity magnetron The cavity magnetron is a high-power vacuum tube used in early radar systems and currently in microwave ovens and linear particle accelerators. It generates microwaves using the interaction of a stream of electrons with a magnetic field while ...
helped to counter the V-1's high speed and small size. In 1944,
Bell Labs Nokia Bell Labs, originally named Bell Telephone Laboratories (1925–1984), then AT&T Bell Laboratories (1984–1996) and Bell Labs Innovations (1996–2007), is an American industrial research and scientific development company owned by mult ...
started delivery of an anti-aircraft predictor
fire-control system A fire-control system (FCS) is a number of components working together, usually a gun data computer, a director, and radar, which is designed to assist a ranged weapon system to target, track, and hit a target. It performs the same task as a ...
based on an
analogue computer An analog computer or analogue computer is a type of computer that uses the continuous variation aspect of physical phenomena such as electrical, mechanical, or hydraulic quantities (''analog signals'') to model the problem being solved. In ...
, just in time for the Allied invasion of Europe. These electronic aids arrived in quantity from June 1944, just as the guns reached their firing positions on the coast. Seventeen percent of all flying bombs entering the coastal "gun belt" were destroyed by guns in their first week on the coast. This rose to 60 percent by 23 August and 74 percent in the last week of the month, when on one day 82 percent were shot down. The rate improved from thousands of shells for every one V-1 destroyed to one for every 100. This mostly ended the V-1 threat. As General Frederick Pile put it in an April 5, 1946 article in the London
Times Time is the continued sequence of existence and events, and a fundamental quantity of measuring systems. Time or times may also refer to: Temporal measurement * Time in physics, defined by its measurement * Time standard, civil time specific ...
: "It was the proximity fuse which made possible the 100 percent successes that A.A. Command was obtaining regularly in the early months of last year...American scientists...gave us the final answer to the flying bomb."


Barrage balloons

Eventually about 2,000
barrage balloon A barrage balloon is a large uncrewed tethered balloon used to defend ground targets against aircraft attack, by raising aloft steel cables which pose a severe collision risk to aircraft, making the attacker's approach more difficult. Early barra ...
s were deployed, in the hope that V-1s would be destroyed when they struck the balloons' tethering cables. The leading edges of the V-1's wings were fitted with Kuto cable cutters, and fewer than 300 V-1s are known to have been brought down by barrage balloons.


Interceptors

The Defence Committee expressed some doubt as to the ability of the
Royal Observer Corps The Royal Observer Corps (ROC) was a civil defence organisation intended for the visual detection, identification, tracking and reporting of aircraft over Great Britain. It operated in the United Kingdom between 29 October 1925 and 31 December ...
to adequately deal with the new threat, but the ROC's Commandant Air Commodore Finlay Crerar assured the committee that the ROC could again rise to the occasion and prove its alertness and flexibility. He oversaw plans for handling the new threat, codenamed by the RAF and ROC as "Operation Totter". Observers at the coast post of
Dymchurch Dymchurch is a village and civil parish in the Folkestone and Hythe district of Kent, England. The village is located on the coast five miles (8 km) south-west of Hythe, and on the Romney Marsh. History The history of Dymchurch began with ...
identified the very first of these weapons and within seconds of their report the anti-aircraft defences were in action. This new weapon gave the ROC much additional work both at posts and operations rooms. Eventually RAF controllers actually took their radio equipment to the two closest ROC operations rooms at Horsham and Maidstone, and vectored fighters direct from the ROC's plotting tables. The critics who had said that the Corps would be unable to handle the fast-flying jet aircraft were answered when these aircraft on their first operation were actually controlled entirely by using ROC information both on the coast and at inland. The average speed of V-1s was and their average altitude was to . Fighter aircraft required excellent low altitude performance to intercept them and enough firepower to ensure that they were destroyed in the air (ideally, also from a sufficient distance, to avoid being damaged by the strong blast) rather than the V-1 crashing to earth and detonating. Most aircraft were too slow to catch a V-1 unless they had a height advantage, allowing them to gain speed by diving on their target. When V-1 attacks began in mid-June 1944, the only aircraft with the low-altitude speed to be effective against it was the
Hawker Tempest The Hawker Tempest is a British fighter aircraft that was primarily used by the Royal Air Force (RAF) in the Second World War. The Tempest, originally known as the ''Typhoon II'', was an improved derivative of the Hawker Typhoon, intended to ...
. Fewer than 30 Tempests were available. They were assigned to
No. 150 Wing RAF The numero sign or numero symbol, №, (also represented as Nº, No, No. or no.), is a typographic abbreviation of the word ''number''(''s'') indicating ordinal numeration, especially in names and titles. For example, using the numero sign, t ...
. Early attempts to intercept and destroy V-1s often failed, but improved techniques soon emerged. These included using the airflow over an interceptor's wing to raise one wing of the V-1, by sliding the wingtip to within of the lower surface of the V-1's wing. If properly executed, this manoeuvre would tip the V-1's wing up, over-riding the
gyro Gyro may refer to: Science and technology * GYRO, a computer program for tokamak plasma simulation * Gyro Motor Company, an American aircraft engine manufacturer * ''Gyrodactylus salaris'', a parasite in salmon * Gyroscope, an orientation-stabi ...
and sending the V-1 into an out-of-control dive. At least sixteen V-1s were destroyed this way (the first by a P-51 piloted by Major R. E. Turner of
356th Fighter Squadron The 356th Fighter Squadron is an active United States Air Force fighter squadron. It is assigned to the 354th Fighter Wing, being stationed at Eielson Air Force Base, Alaska. It was reactivated in 2019 to operate the Lockheed Martin F-35 Li ...
on 18 June). The Tempest fleet was built up to over 100 aircraft by September, and during the short summer nights the Tempests shared defensive duty with twin-engined
de Havilland Mosquito The de Havilland DH.98 Mosquito is a British twin-engined, shoulder-winged, multirole combat aircraft, introduced during the Second World War. Unusual in that its frame was constructed mostly of wood, it was nicknamed the "Wooden Wonder", or ...
s. Specially modified Republic P-47M Thunderbolts were also pressed into service against the V-1s; they had boosted engines () and had half their .50 calibre (12.5 mm) machine guns and half their fuel tanks, all external fittings and all their armour plate removed to reduce weight. In addition,
North American P-51 Mustang The North American Aviation P-51 Mustang is an American long-range, single-seat fighter aircraft, fighter and fighter-bomber used during World War II and the Korean War, among other conflicts. The Mustang was designed in April 1940 by a team ...
s and Griffon-engined
Supermarine Spitfire The Supermarine Spitfire is a British single-seat fighter aircraft used by the Royal Air Force and other Allied countries before, during, and after World War II. Many variants of the Spitfire were built, from the Mk 1 to the Rolls-Royce Grif ...
Mk XIVs were tuned to make them fast enough, At night airborne radar was not needed, as the V-1 engine could be heard from away or more and the exhaust plume was visible from a long distance.
Wing Commander Wing commander (Wg Cdr in the RAF, the IAF, and the PAF, WGCDR in the RNZAF and RAAF, formerly sometimes W/C in all services) is a senior commissioned rank in the British Royal Air Force and air forces of many countries which have historical ...
Roland Beamont Wing Commander Roland Prosper "Bee" Beamont, (10 August 1920 – 19 November 2001) was a British fighter pilot for the Royal Air Force (RAF) and an experimental test pilot during and after the Second World War. He was the first British pilot to ...
had the 20 mm cannon on his Tempest adjusted to converge at ahead. This was so successful that all other aircraft in 150 Wing were thus modified. The anti-V-1 sorties by fighters were known as "Diver patrols" (after "Diver", the codename used by the
Royal Observer Corps The Royal Observer Corps (ROC) was a civil defence organisation intended for the visual detection, identification, tracking and reporting of aircraft over Great Britain. It operated in the United Kingdom between 29 October 1925 and 31 December ...
for V-1 sightings). Attacking a V-1 was dangerous: machine guns had little effect on the V-1's sheet steel structure, and if a cannon shell detonated the warhead, the explosion could destroy the attacker. In daylight, V-1 chases were chaotic and often unsuccessful until a special defence zone was declared between London and the coast, in which only the fastest fighters were permitted. The first interception of a V-1 was by F/L J. G. Musgrave with a No. 605 Squadron RAF Mosquito night fighter on the night of 14/15 June 1944. As daylight grew stronger after the night attack, a Spitfire was seen to follow closely behind a V-1 over Chislehurst and Lewisham. Between June and 5 September 1944, a handful of 150 Wing Tempests shot down 638 flying bombs, with
No. 3 Squadron RAF Number 3 Squadron, also known as No. 3 (Fighter) Squadron, of the Royal Air Force operates the Eurofighter Typhoon FGR4 from RAF Coningsby, Lincolnshire, since reforming on 1 April 2006. It was first formed on 13 May 1912 as one of the first squ ...
alone claiming 305. One Tempest pilot, Squadron Leader Joseph Berry ( 501 Squadron), shot down 59 V-1s, the Belgian ace Squadron Leader
Remy Van Lierde Colonel Remy Van Lierde, (14 August 1915 – 8 June 1990) was a Belgian pilot and fighter ace who served in the aviation branch of the Belgian Army and the British Royal Air Force (RAF) during the Second World War, shooting down six enemy ...
( 164 Squadron) destroyed 44 (with a further nine shared), W/C Roland Beamont destroyed 31, and F/Lt Arthur Umbers (No. 3 squadron) destroyed 28. A Dutch pilot in 322 Squadron, Jan Leendert Plesman, son of
KLM KLM Royal Dutch Airlines, legally ''Koninklijke Luchtvaart Maatschappij N.V.'' (literal translation: Royal Aviation Company Plc.), is the flag carrier airline of the Netherlands. KLM is headquartered in Amstelveen, with its hub at nearby Amste ...
president
Albert Plesman Albert Plesman (7 September 1889 – 31 December 1953) was a Dutch pioneer in aviation and the first administrator and later director of the KLM, the oldest airline in the world still operating under its original name. Until his death, he was in ...
, managed to destroy 12 in 1944, flying a Spitfire. The next most successful interceptors were the Mosquito (623 victories), Spitfire XIV (303), and Mustang (232). All other types combined added 158. Even though it was not fully operational, the jet-powered
Gloster Meteor The Gloster Meteor was the first British jet fighter and the Allies of World War II, Allies' only jet aircraft to engage in combat operations during the Second World War. The Meteor's development was heavily reliant on its ground-breaking turb ...
was rushed into service with No. 616 Squadron RAF to fight the V-1s. It had ample speed but its cannons were prone to jamming, and it shot down only 13 V-1s. In late 1944 a radar-equipped
Vickers Wellington The Vickers Wellington was a British twin-engined, long-range medium bomber. It was designed during the mid-1930s at Brooklands in Weybridge, Surrey. Led by Vickers-Armstrongs' chief designer Rex Pierson; a key feature of the aircraft is its g ...
bomber was modified for use by the RAF's
Fighter Interception Unit The Fighter Interception Development Unit RAF was a special interceptor aircraft unit of the Royal Air Force (RAF) during the Second World War. It was part of Air Defence of Great Britain and was previously the Fighter Interception Unit (FIU). ...
as an
airborne early warning and control Airborne or Airborn may refer to: Arts, entertainment, and media Films * ''Airborne'' (1962 film), a 1962 American film directed by James Landis * ''Airborne'' (1993 film), a comedy–drama film * ''Airborne'' (1998 film), an action film sta ...
aircraft. Flying at an altitude of over the North Sea at night, it directed Mosquito and Beaufighters charged with intercepting He 111s from Dutch airbases that sought to launch V-1s from the air.


Disposal

The first
bomb disposal Bomb disposal is an explosives engineering profession using the process by which hazardous Explosive device, explosive devices are rendered safe. ''Bomb disposal'' is an all-encompassing term to describe the separate, but interrelated functi ...
officer to defuse an unexploded V-1 was
John Pilkington Hudson John Pilkington Hudson, (24 July 1910 – 6 December 2007) was an English horticultural scientist who did pioneer work on long-distance transportability of what became known as the kiwifruit. He was also a celebrated bomb disposal expert. Backgr ...
in 1944.


Deception

To adjust and correct settings in the V-1 guidance system, the Germans needed to know where the V-1s were impacting. Therefore, German intelligence was requested to obtain this impact data from their agents in Britain. However, all German agents in Britain had been turned, and were acting as double agents under British control. On 16 June 1944, British double agent ''Garbo'' ( Juan Pujol) was requested by his German controllers to give information on the sites and times of V-1 impacts, with similar requests made to the other German agents in Britain, ''Brutus'' (
Roman Czerniawski Roman Garby-Czerniawski (6 February 1910 – 26 April 1985) was a Polish Air Force captain and Allied double agent during World War II who used the code name Brutus. Early life Czerniawski graduated in the late 1930s from the Wyższa Szko ...
) and ''Tate'' (
Wulf Schmidt Wulf Dietrich Christian Schmidt, later known as Harry Williamson (7 December 1911 – 19 October 1992) was a Danish citizen who became a double agent working for Britain against Nazi Germany during the Second World War under the codename Tate. H ...
). If given this data, the Germans would be able to adjust their aim and correct any shortfall. However, there was no plausible reason why the double agents could not supply accurate data; the impacts would be common knowledge amongst Londoners and very likely reported in the press, which the Germans had ready access to through the neutral nations. In addition, as
John Cecil Masterman Sir John Cecil Masterman OBE (12 January 1891 – 6 June 1977) was a noted academic, sportsman and author. His highest-profile role was as Vice-Chancellor of the University of Oxford, but he was also well known as chairman of the Twenty C ...
, chairman of the Twenty Committee, commented, "If, for example, St Paul's Cathedral were hit, it was useless and harmful to report that the bomb had descended upon a cinema in
Islington Islington () is a district in the north of Greater London, England, and part of the London Borough of Islington. It is a mainly residential district of Inner London, extending from Islington's High Street to Highbury Fields, encompassing the ar ...
, since the truth would inevitably get through to Germany ..." While the British decided how to react, Pujol played for time. On 18 June it was decided that the double agents would report the damage caused by V-1s fairly accurately and minimise the effect they had on civilian morale. It was also decided that Pujol should avoid giving the times of impacts, and should mostly report on those which occurred in the north west of London, to give the impression to the Germans that they were overshooting the target area. While Pujol downplayed the extent of V-1 damage, trouble came from ''Ostro'', an agent in
Lisbon Lisbon (; pt, Lisboa ) is the capital and largest city of Portugal, with an estimated population of 544,851 within its administrative limits in an area of 100.05 km2. Grande Lisboa, Lisbon's urban area extends beyond the city's administr ...
who pretended to have agents reporting from London. He told the Germans that London had been devastated and had been mostly evacuated as a result of enormous casualties. The Germans could not perform aerial reconnaissance of London, and believed his damage reports in preference to Pujol's. They thought that the Allies would make every effort to destroy the V-1 launch sites in France. They also accepted ''Ostro''s impact reports. Due to
Ultra adopted by British military intelligence in June 1941 for wartime signals intelligence obtained by breaking high-level encrypted enemy radio and teleprinter communications at the Government Code and Cypher School (GC&CS) at Bletchley Park. '' ...
, however, the Allies read his messages and adjusted for them. A certain number of the V-1s fired had been fitted with radio transmitters, which had clearly demonstrated a tendency for the V-1 to fall short. Max Wachtel, commander of Flak Regiment 155 (W), which was responsible for the V-1 offensive, compared the data gathered by the transmitters with the reports obtained through the double agents. He concluded, when faced with the discrepancy between the two sets of data, that there must be a fault with the radio transmitters, as he had been assured that the agents were completely reliable. It was later calculated that if Wachtel had disregarded the agents' reports and relied on the radio data, he would have made the correct adjustments to the V-1's guidance, and casualties might have increased by 50 percent or more. The policy of diverting V-1 impacts away from central London was initially controversial. The War Cabinet refused to authorise a measure that would increase casualties in any area, even if it reduced casualties elsewhere by greater amounts. It was thought that
Churchill Sir Winston Leonard Spencer Churchill (30 November 187424 January 1965) was a British statesman, soldier, and writer who served as Prime Minister of the United Kingdom twice, from 1940 to 1945 during the Second World War, and again from 1 ...
would reverse this decision later (he was then away at a conference); but the delay in starting the reports to Germans might be fatal to the deception. So Sir
Findlater Stewart Sir Samuel Findlater Stewart (22 December 1879 – 11 April 1960) was a Scottish civil servant of the India Office. From 1930 to 1941, he served as Permanent Under-Secretary of State for India, the most senior civil servant in the India Off ...
of
Home Defence Executive The Home Defence Executive (H.D.E.) was formed on 10 May 1940 under General Sir Edmund Ironside, Commander-in-chief Home Forces, to organise the defence of Britain from invasion by the Axis powers Collier, Basil. "The defence of the United Kingdo ...
took responsibility for starting the deception programme immediately, and his action was approved by Churchill when he returned.


Effect

By September 1944, the V-1 threat to England was temporarily halted when the launch sites on the French coast were overrun by the advancing Allied armies. In total, 10,492 V1s were launched against Britain, with a nominal aiming point of
Tower Bridge Tower Bridge is a Listed building#Grade I, Grade I listed combined Bascule bridge, bascule and Suspended-deck suspension bridge, suspension bridge in London, built between 1886 and 1894, designed by Horace Jones (architect), Horace Jones and e ...
. 4,261 V-1s had been destroyed by fighters, anti-aircraft fire and barrage balloons. Approximately 2,400 V-1s landed within Greater London, inflicting 6,000 fatalities and 18,000 serious injuries. The last enemy action of any kind on British soil occurred on 29 March 1945, when a V-1 struck
Datchworth Datchworth is a village and civil parish between the towns of Hertford, Stevenage and Welwyn Garden City in the county of Hertfordshire, England. Sited on the Roman road from St Albans to Puckeridge, the village has examples of Anglo-Saxons, Saxo ...
in Hertfordshire.


Assessment

Unlike the V-2, the V-1 was a cost-effective weapon for the Germans as it forced the Allies to spend heavily on defensive measures and divert bombers from other targets. More than 25% of
Combined Bomber Offensive The Combined Bomber Offensive (CBO) was an Allies of World War II, Allied offensive of strategic bombing during World War II, strategic bombing during World War II in Europe. The primary portion of the CBO was directed against Luftwaffe targets w ...
's bombs in July and August 1944 were used against V-weapon sites, often ineffectively. In early December 1944, American General
Clayton Bissell Major General Clayton Lawrence Bissell (July 29, 1893 – December 24, 1972) was an air officer in the United States Army and United States Army Air Forces during World War I and World War II. World War I service Bissell graduated from Valpara ...
wrote a paper that argued strongly in favour of the V-1 when compared with conventional bombers. The following is a table he produced: The statistics of this report, however, have been the subject of some dispute. The V-1 missiles launched from bombers were often prone to exploding prematurely, occasionally resulting in the loss of the aircraft to which they were attached. The Luftwaffe lost 77 aircraft in 1,200 of these sorties.
Wright Field Wilbur Wright Field was a military installation and an airfield used as a World War I pilot, mechanic, and armorer training facility and, under different designations, conducted United States Army Air Corps and Air Forces flight testing. Loca ...
technical personnel
reverse-engineered Reverse engineering (also known as backwards engineering or back engineering) is a process or method through which one attempts to understand through deductive reasoning how a previously made device, process, system, or piece of software accompli ...
the V-1 from the remains of one that had failed to detonate in Britain and the
Republic-Ford JB-2 The Republic-Ford JB-2, also known as the Thunderbug, KGW and LTV-N-2 Loon, was a United States copy of the German V-1 flying bomb. Developed in 1944, and planned to be used in the United States invasion of Japan (Operation Downfall), t ...
was being delivered by early 1945. After the end of the war in Europe it was in consideration for use against Japan. General
Hap Arnold Henry Harley Arnold (June 25, 1886 – January 15, 1950) was an American general officer holding the ranks of General of the Army and later, General of the Air Force. Arnold was an aviation pioneer, Chief of the Air Corps (1938–1941), ...
of the United States Army Air Forces was concerned that this weapon could be built of steel and wood, in 2,000 man-hours and approximate cost of US$600 (in 1943). To put this in perspective, a single
Boeing B-29 Superfortress The Boeing B-29 Superfortress is an American four-engined propeller-driven heavy bomber, designed by Boeing and flown primarily by the United States during World War II and the Korean War. Named in allusion to its predecessor, the B-17 Fl ...
airframe (based on program costs) cost about 126 times as much per ton of explosive delivered, not including the much higher costs for injured or killed aircrew, fuel, maintenance, bombs, ammunition, repairs, training and accidents, and despite being reusable, almost never accomplished enough missions to even approach covering just the production costs.


Belgian attacks

The attacks on
Antwerp Antwerp (; nl, Antwerpen ; french: Anvers ; es, Amberes) is the largest city in Belgium by area at and the capital of Antwerp Province in the Flemish Region. With a population of 520,504,
and
Brussels Brussels (french: Bruxelles or ; nl, Brussel ), officially the Brussels-Capital Region (All text and all but one graphic show the English name as Brussels-Capital Region.) (french: link=no, Région de Bruxelles-Capitale; nl, link=no, Bruss ...
began in October 1944, with the last V-1 launched against Antwerp on 30 March 1945. The shorter range improved the accuracy of the V-1 which was deviation per of flight, the flight level was also reduced to around . The
Port of Antwerp The Port of Antwerp-Bruges is the port of the City of Antwerp. It is located in Flanders (Belgium), mainly in the province of Antwerp but also partially in the province of East Flanders. It is a seaport in the heart of Europe accessible to ...
was recognised by both the German and Allied high commands as a very important port. It was essential logistically for the further progression of Allied armies into Germany, although initially Montgomery had not given high priority to seizure of the
Scheldt estuary The Scheldt (french: Escaut ; nl, Schelde ) is a river that flows through northern France, western Belgium, and the southwestern part of the Netherlands, with its mouth at the North Sea. Its name is derived from an adjective corresponding to ...
giving access to the port.


Countermeasures at Antwerp

Both British ( 80 AA Brigade) and US Army anti-aircraft batteries (30th AAA Group) were sent to Antwerp together with a searchlight regiment. The zone of command under the
21st Army Group The 21st Army Group was a British headquarters formation formed during the Second World War. It controlled two field armies and other supporting units, consisting primarily of the British Second Army and the First Canadian Army. Established in ...
was called "Antwerp-X" and given the object of protecting an area with a radius of covering the city and dock area. Initially attacks came from the south-east, accordingly a screen of observers and searchlights was deployed along the attack azimuth, behind which were three rows of batteries with additional searchlights. US units deployed
SCR-584 radar The SCR-584 (short for '' Set, Complete, Radio # 584'') was an automatic-tracking microwave radar developed by the MIT Radiation Laboratory during World War II. It was one of the most advanced ground-based radars of its era, and became one of th ...
units controlling four 90mm guns per battery using an M9 director to electrically control the battery guns. Backup for the American guns was automatic 40mm batteries, which were not effective against V-1s. British gun batteries were each equipped with eight
QF 3.7-inch AA gun The QF 3.7-inch AA was Britain's primary heavy anti-aircraft gun during World War II. It was roughly the equivalent of the German Flak 8.8 cm and American 90 mm, but with a slightly larger calibre of 3.7 inches, approximately 94 mm. ...
(94mm) and two radar units, preferably the US SCR-584 with M9 director as it was more accurate than the British system. Backup for the British guns was also automatic 40mm batteries. The radar was effective from , the M9 director predicted the target location position based on course, height and speed which combined with the gun, shell and fuse characteristics predicted an impact position, adjusted each gun and fired the shell. In November attacks began from the north-east and additional batteries were deployed along the new azimuths, including the
184th AAA Battalion (United States) The 184th AAA Gun Battalion was an American antiaircraft artillery battalion of World War II. The 184th was activated in 1943 as part of the reorganization of the 61st Coast Artillery Regiment. After training in England, it took part in the air ...
brought from Paris. Additional radar units and observers were deployed up to 40 miles from Antwerp to give early warning of V-1 bombs approaching. The introduction of the VT fuse in January 1945 improved the effectiveness of the guns and reduced ammunition consumption. From October 1944 to March 1945, 4,883 V-1s were detected. Of these, only 4.5% fell into the designated protected area. The effectiveness of the anti-aircraft defence meant that only 211 got through the defences; however, those that fell within the area caused damage and loss of life.


Japanese developments

In 1943, an Argus pulsejet engine was shipped to Japan by German submarine. The Aeronautical Institute of
Tokyo Imperial University , abbreviated as or UTokyo, is a public research university located in Bunkyō, Tokyo, Japan. Established in 1877, the university was the first Imperial University and is currently a Top Type university of the Top Global University Project by ...
and the
Kawanishi Aircraft Company was a Japanese aircraft manufacturer during World War II. History The company was founded as Kawanishi Engineering Works in 1920 in Hyōgo Prefecture as an outgrowth of the Kawanishi conglomerate, which had been funding the Nakajima Aircraft Co ...
conducted a joint study of the feasibility of mounting a similar engine on a piloted plane. The resulting design was named ("plum blossom") but bore no more than a superficial resemblance to the Fi 103. never left the design stage but technical drawings and notes suggest that several versions were considered: an air-launched version with the engine under the fuselage, a ground-launched version that could take off without a ramp and a submarine launched version with the engine moved forwards.


Post-war

After the war, the armed forces of France, the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...
and the United States experimented with the V-1.


France

After reverse-engineering captured V-1s in 1946, the French began producing copies for use as
target drone A target drone is an unmanned aerial vehicle, generally remote controlled, usually used in the training of anti-aircraft crews. One of the earliest drones was the British DH.82 Queen Bee, a variant of the Tiger Moth trainer aircraft operationa ...
s, starting in 1951. These were called the ARSAERO CT 10 and were smaller than the V-1. The CT 10 could be ground-launched using
solid rocket boosters A solid rocket booster (SRB) is a large solid propellant motor used to provide thrust in spacecraft launches from initial launch through the first ascent. Many launch vehicles, including the Atlas V, SLS and space shuttle, have used SRBs to give ...
or air-launched from a
LeO 45 Leo or Léo may refer to: Acronyms * Law enforcement officer * Law enforcement organisation * '' Louisville Eccentric Observer'', a free weekly newspaper in Louisville, Kentucky * Michigan Department of Labor and Economic Opportunity Arts a ...
bomber. More than 400 were produced, some of which were exported to the UK, Sweden, and Italy.


Soviet Union

The Soviet Union captured V-1s when they overran the
Blizna :''See also Blizna, Podlaskie Voivodeship. For the Polish film of this name see The Scar (1976 film).'' Blizna is a village in the administrative district of Gmina Ostrów, within Ropczyce-Sędziszów County, Subcarpathian Voivodeship, in south- ...
test range in Poland, as well as from the
Mittelwerk Mittelwerk (; German for "Central Works") was a German World War II factory built underground in the Kohnstein to avoid Allied bombing. It used slave labor from the Mittelbau-Dora concentration camp to produce V-2 ballistic missiles, V-1 flyin ...
. The 10Kh was their copy of the V-1, later called Izdeliye 10. Initial tests began in March 1945 at a test range in
Tashkent Tashkent (, uz, Toshkent, Тошкент/, ) (from russian: Ташкент), or Toshkent (; ), also historically known as Chach is the capital and largest city of Uzbekistan. It is the most populous city in Central Asia, with a population of ...
, with further launches from ground sites and from aircraft of improved versions continuing into the late 1940s. The inaccuracy of the guidance system when compared with new methods such as
beam-riding Beam-riding, also known as Line-Of-Sight Beam Riding (LOSBR) or beam guidance, is a technique of directing a missile to its target by means of radar or a laser beam. The name refers to the way the missile flies down the guidance beam, which is ai ...
and
TV guidance Television guidance (TGM) is a type of missile guidance system using a television camera in the missile or glide bomb that sends its signal back to the launch platform. There, a weapons officer or bomb aimer watches the image on a television screen ...
saw development end in the early 1950s. The Soviets also worked on a piloted attack aircraft based on the Argus pulsejet engine of the V-1, which began as a German project, the
Junkers EF 126 The Junkers EF 126 was an experimental fighter proposed by the German of 1944–1945, for a cheap and simple fighter powered by a pulsejet engine. No examples were built during the war, but the Soviet Union completed both unpowered and powered p ...
, in the latter stages of the war. The Soviet development of the ended in 1946 after a crash that killed the test pilot.


United States

The United States reverse-engineered the V-1 in 1944 from salvaged parts recovered in England during June. By 8 September, the first of thirteen complete prototype
Republic-Ford JB-2 The Republic-Ford JB-2, also known as the Thunderbug, KGW and LTV-N-2 Loon, was a United States copy of the German V-1 flying bomb. Developed in 1944, and planned to be used in the United States invasion of Japan (Operation Downfall), t ...
, was assembled at
Republic Aviation The Republic Aviation Corporation was an American aircraft manufacturer based in Farmingdale, New York, on Long Island, New York, Long Island. Originally known as the Seversky Aircraft Company, the company was responsible for the design and produc ...
. The United States JB-2 was different from the German V-1 in only the smallest of dimensions, with only the forward pulsejet support pylon visibly differing in shape from the original German pilotless ordnance design. The wing span was only wider and the length was extended less than . The difference gave the JB-2 of wing area versus for the V-1. A navalised version, designated KGW-1, was developed to be launched from LSTs as well as
escort carrier The escort carrier or escort aircraft carrier (U.S. hull classification symbol CVE), also called a "jeep carrier" or "baby flattop" in the United States Navy (USN) or "Woolworth Carrier" by the Royal Navy, was a small and slow type of aircraft ...
s (CVEs) and long-range 4-engine reconnaissance aircraft. Waterproof carriers for the KGW-1 were developed for launches of the missile from surfaced submarines. Both the USAAF JB-2 and Navy KGW-1 were put into production and were planned to be used in the Allied invasion of Japan (
Operation Downfall Operation Downfall was the proposed Allied plan for the invasion of the Japanese home islands near the end of World War II. The planned operation was canceled when Japan surrendered following the atomic bombings of Hiroshima and Nagasaki, th ...
). However, the surrender of Japan obviated the need for its use. After the end of the war, the JB-2/KGW-1 played a significant role in the development of more advanced surface-to-surface tactical missile systems such as the
MGM-1 Matador The Martin MGM-1 Matador was the first operational surface-to-surface cruise missile designed and built by the United States. It was developed after World War II, drawing upon their wartime experience with creating the Republic-Ford JB-2, a ...
and later
MGM-13 Mace The Martin Mace was a ground-launched cruise missile developed from the earlier Martin TM-61 Matador. It used a new self-contained navigation system that eliminated the need to get updates from ground-based radio stations, and thereby allowed i ...
.


Operators

; *


Surviving examples

;Australia * The
Australian War Memorial The Australian War Memorial is Australia's national memorial to the members of its armed forces and supporting organisations who have died or participated in wars involving the Commonwealth of Australia and some conflicts involving pe ...
in
Canberra Canberra ( ) is the capital city of Australia. Founded following the federation of the colonies of Australia as the seat of government for the new nation, it is Australia's largest inland city and the eighth-largest city overall. The ci ...
,
Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
;Belgium * The Stampe en Vertongen Museum at
Antwerp International Airport Antwerp International Airport, french: Aéroport International d'Anvers, german: Flughafen Antwerpen is a small international airport serving the City of Antwerp in the Province of Antwerp in the Flemish Region of Belgium. Located south of t ...
has a V-1 on display. ;Canada * The
Atlantic Canada Aviation Museum The Atlantic Canada Aviation Museum is an aerospace museum located in Halifax, Nova Scotia, Canada near the Halifax Stanfield International Airport. History The museum was established in 1977 by a group of volunteers. It opened to the public in 1 ...
in
Halifax, Nova Scotia Halifax is the capital and largest municipality of the Canadian province of Nova Scotia, and the largest municipality in Atlantic Canada. As of the 2021 Census, the municipal population was 439,819, with 348,634 people in its urban area. The ...
;Denmark * The Danish War Museum (''Krigsmuseet'', formerly ''Tøjhusmuseet'') in
Copenhagen Copenhagen ( or .; da, København ) is the capital and most populous city of Denmark, with a proper population of around 815.000 in the last quarter of 2022; and some 1.370,000 in the urban area; and the wider Copenhagen metropolitan ar ...
;France * The Grand Bunker Museum in
Ouistreham Ouistreham () is a commune in the Calvados department in Normandy region in northwestern France. Ouistreham is a small port with fishing boats, leisure craft and a ferry harbour. It serves as the port of the city of Caen. The town borders the mo ...
, near
Caen Caen (, ; nrf, Kaem) is a commune in northwestern France. It is the prefecture of the department of Calvados. The city proper has 105,512 inhabitants (), while its functional urban area has 470,000,Sword Beach Sword, commonly known as Sword Beach, was the code name given to one of the five main landing areas along the Normandy coast during the initial assault phase, Operation Neptune, of Operation Overlord. The Allied invasion of German-occupied Fra ...
, displays a V-1 flying bomb. *
Blockhaus d'Éperlecques The ''Blockhaus d'Éperlecques'' ( en, Bunker of Éperlecques, also referred to as "the Watten bunker" or simply "Watten") is a Second World War bunker, now part of a museum, near Saint-Omer in the northern Pas-de-Calais Departments of France, ...
, near
Saint-Omer Saint-Omer (; vls, Sint-Omaars) is a commune and sub-prefecture of the Pas-de-Calais department in France. It is west-northwest of Lille on the railway to Calais, and is located in the Artois province. The town is named after Saint Audomar, ...
. Although this was intended as a V-2 launch site the museum on the site has a display devoted to the V-1, including a V-1 cruise missile and an entire launch ramp. * Le Val Ygot at Ardouval, north of Saint-Saëns. Disabled by Allied bombing in December 1943, before completion. Remains of blockhouses, with recreated launch ramp and mock V1. *
La Coupole ''La Coupole'' ( en, The Dome), also known as the ''Coupole d'Helfaut-Wizernes'' and originally codenamed ''Bauvorhaben'' 21 ('Building Project 21') or ''Schotterwerk Nordwest'' (Northwest Gravel Works), is a Second World War bunker complex in the ...
, near Saint-Omer, has a V-1 that it was lent by the
Science Museum A science museum is a museum devoted primarily to science. Older science museums tended to concentrate on static displays of objects related to natural history, paleontology, geology, industry and industrial machinery, etc. Modern trends in mu ...
in London. * The
Overlord Museum The Overlord Museum is a museum which focuses on the Allied landings in Normandy with Operation Overlord and the subsequent development of the Second World War. It is located in Colleville-sur-Mer in the Calvados department of the Normandy reg ...
in
Colleville-sur-Mer Colleville-sur-Mer (, literally ''Colleville on Sea'') is a commune in the Calvados department in Normandie region in northwestern France. History It was originally a farm owned by a certain ''Koli'', a Scandinavian settler in the Middle Ag ...
, near the
Normandy American Cemetery and Memorial The Normandy American Cemetery and Memorial (french: Cimetière américain de Colleville-sur-Mer) is a World War II cemetery and memorial in Colleville-sur-Mer, Normandy, France, that honors American troops who died in Europe during World War II. ...
and
Omaha Beach Omaha Beach was one of five beach landing sectors designated for the amphibious assault component of operation Overlord during the Second World War. On June 6, 1944, the Allies invaded German-occupied France with the Normandy landings. "Omaha" r ...
, displays a French copy of the V-1; actually a CT 10 target drone. * Tosny Museum, near
Les Andelys Les Andelys (; Norman: ''Les Aundelys'') is a commune in the northern French department of Eure, in Normandy. Geography It lies on the Seine, about northeast of Évreux. The commune is divided into two parts, Grand-Andely (located about from ...
, displays a restored Fieseler 103 A1, launched on 13 June from Pont-Montauban base and crashed in the mud without exploding after flying 10 km. ;Germany *
Deutsches Museum The Deutsches Museum (''German Museum'', officially (English: ''German Museum of Masterpieces of Science and Technology'')) in Munich, Germany, is the world's largest museum of science and technology, with about 28,000 exhibited objects from ...
in Munich ;The Netherlands *
Overloon War Museum The Overloon War Museum (''Dutch: Oorlogsmuseum Overloon'') is located in Overloon, Netherlands. The museum was opened on May 25, 1946, making it one of the oldest museums in Europe dedicated to the Second World War. The museum is located on ...
in Overloon * Museum Vliegbasis Deelen in Schaarsbergen * National Military Museum in Soesterberg has a V1 and a V1 Reichenberg ;New Zealand *
Auckland War Memorial Museum The Auckland War Memorial Museum Tāmaki Paenga Hira (or simply the Auckland Museum) is one of New Zealand's most important museums and war memorials. Its collections concentrate on New Zealand history (and especially the history of the Aucklan ...
, Auckland *
Museum of Transport and Technology The Museum of Transport and Technology (MOTAT) is a science and technology museum located in Western Springs, Auckland, New Zealand. It is located close to the Western Springs Stadium, Auckland Zoo and the Western Springs Park. The museum has ...
, Auckland ;Sweden * A V-1 in the Arboga Missile museum ;Switzerland *A restored original V-1 is on display, as well as one of only six worldwide remaining original Reichenberg (Re 4-27), at the Swiss Military Museum in Full ;United Kingdom * A reproduction V-1 is located at the Eden Camp in North Yorkshire. * Fi-103 serial number 442795 is on display at the
Science Museum, London The Science Museum is a major museum on Exhibition Road in South Kensington, London. It was founded in 1857 and is one of the city's major tourist attractions, attracting 3.3 million visitors annually in 2019. Like other publicly funded ...
. It was presented to the museum in 1945 by the War Office. * A V-1 is on a partial ramp section, at the
Imperial War Museum Duxford Imperial War Museum Duxford is a branch of the Imperial War Museum near Duxford in Cambridgeshire, England. Britain's largest aviation museum, Duxford houses the museum's large exhibits, including nearly 200 aircraft, military vehicles, artill ...
; the museum also has a partially recreated launch ramp with a mock–up V-1 displayed outside. * A V-1 is on display with a
V-2 The V-2 (german: Vergeltungswaffe 2, lit=Retaliation Weapon 2), with the technical name ''Aggregat 4'' (A-4), was the world’s first long-range guided ballistic missile. The missile, powered by a liquid-propellant rocket engine, was develope ...
at the
RAF Museum Hendon The Royal Air Force Museum London (also commonly known as the RAF Museum) is located on the former Hendon Aerodrome. It includes five buildings and hangars showing the history of aviation and the Royal Air Force. It is part of the Royal Air Forc ...
, north London * a V-1 is on display at the other RAF Museum site,
RAF Museum Cosford The Royal Air Force Museum Cosford, located in Cosford in Shropshire, is a free (currently, 2022) museum dedicated to the history of aviation and the Royal Air Force in particular. The museum is part of the Royal Air Force Museum, a non-departme ...
in
Shropshire Shropshire (; alternatively Salop; abbreviated in print only as Shrops; demonym Salopian ) is a landlocked historic county in the West Midlands region of England. It is bordered by Wales to the west and the English counties of Cheshire to th ...
* A
Fieseler Fi 103R Reichenberg The Fieseler Fi 103R, code-named ''Reichenberg'', was German manned version of the V-1 flying bomb (more correctly known as the ''Fieseler Fi 103''). It was developed towards the end of the Second World War and, although it never entered service ...
—the piloted version of the V1—is usually on display a
Headcorn (Lashenden) Airfield's Air Warfare Museum
* A V-1 is on display with a V-2 in the new Atrium of the
Imperial War Museum Imperial War Museums (IWM) is a British national museum organisation with branches at five locations in England, three of which are in London. Founded as the Imperial War Museum in 1917, the museum was intended to record the civil and military ...
, London * The Aeropark at East Midlands Airport also has a V-1 on display. * A V-1 replica and original launch rail and equipment is on display at the
Kent Battle of Britain Museum The Kent Battle of Britain Museum is an aviation museum located in Hawkinge, Kent, focused on the Battle of Britain. The Spirit of the Few Monument is in the grounds of the museum. Collection Exhibits: * De Havilland Moth replica G-AAAH * Fie ...
* A V-1 replica is displayed at The Muckleburgh Collection near Weybourne in Norfolk. According to the collection's website, the replica is displayed on a section of the original Peenemunde launch ramp. ;United States * A V-1 is on display at the US Army Air Defense Artillery Museum, Fort Sill, OK. * FZG-76 is on display as a war memorial at the southwest corner of the Putnam County Courthouse in Greencastle, Indiana. * The Smithsonian's
National Air and Space Museum The National Air and Space Museum of the Smithsonian Institution, also called the Air and Space Museum, is a museum in Washington, D.C., in the United States. Established in 1946 as the National Air Museum, it opened its main building on the Nat ...
on the National Mall in Washington, D.C. * A V-1 is on display at the
Air Zoo The Air Zoo, founded as the Kalamazoo Aviation History Museum, is an aviation museum and indoor amusement park next to the Kalamazoo-Battle Creek International Airport in Portage, Michigan. The Air Zoo holds many historical and rare aircraft, inc ...
in
Portage Portage or portaging (Canada: ; ) is the practice of carrying water craft or cargo over land, either around an obstacle in a river, or between two bodies of water. A path where items are regularly carried between bodies of water is also called a ...
, Michigan. * The
Cosmosphere Cosmosphere is a space museum and STEM education center in Hutchinson, Kansas, United States. It was previously known as the Kansas Cosmosphere. The museum houses over 13,000 spaceflight artifacts—the largest combined collection of US and R ...
in
Hutchinson, Kansas Hutchinson is the largest city and county seat in Reno County, Kansas, United States, and located on the Arkansas River. It has been home to salt mines since 1887, thus its nickname of "Salt City", but locals call it "Hutch". As of the 2020 cen ...
has a V-1 display which consists of a post-war "hybrid" of German-machined and American parts. In particular, it has a JB-2 Loon-style forward engine support fairing. * A V-1 is also located at the
Fantasy of Flight Fantasy of Flight is an aviation museum in Polk City, Florida. It opened in November 1995, to house Kermit Weeks' collection of aircraft that, until Hurricane Andrew damaged many in 1992, were housed at the Weeks Air Museum in Tamiami, Florida ...
aviation museum in
Polk City, Florida Polk City is a city in Polk County, Florida, United States. The population was 1,562 at the 2010 census. As of 2018, the population recorded by the U.S. Census Bureau is 2,422. It is part of the Lakeland– Winter Haven Metropolitan Statistica ...
* V-1 #121536 is on display at the
Pima Air and Space Museum The Pima Air & Space Museum, located in Tucson, Arizona, Tucson, Arizona, is one of the world's largest non-government funded aerospace museums. The museum features a display of nearly 300 aircraft spread out over 80 acres (320,000 m² ...
, in
Tucson, Arizona , "(at the) base of the black ill , nicknames = "The Old Pueblo", "Optics Valley", "America's biggest small town" , image_map = , mapsize = 260px , map_caption = Interactive map ...
. * A V-1 and
Fieseler Fi 103R Reichenberg The Fieseler Fi 103R, code-named ''Reichenberg'', was German manned version of the V-1 flying bomb (more correctly known as the ''Fieseler Fi 103''). It was developed towards the end of the Second World War and, although it never entered service ...
are on display at the
Flying Heritage Collection The Flying Heritage & Combat Armor Museum is a 501(c)(3) nonprofit organization dedicated to the display and preservation of rare military aircraft, tanks and other military equipment. The plan is for the museum to reopen in 2023. On rotation in ...
* A V-1 is on display at the
Military Aviation Museum The Military Aviation Museum in Virginia Beach, Virginia, is home to one of the world's largest collections of warbirds in flying condition. It includes examples from Germany, France, Italy, Russia, the United Kingdom, and the United States, from ...
in Virginia Beach, VA. * A V-1 is on display at the
Museum of Flight The Museum of Flight is a private non-profit air and space museum in the Seattle metropolitan area. It is located at the southern end of King County International Airport (Boeing Field) in the city of Tukwila, immediately south of Seattle.< ...
in Seattle, WA.


See also

*
Aggregat (rocket family) The Aggregat series (German for "Aggregate") was a set of ballistic missile designs developed in 1933–1945 by a research program of Nazi Germany's Armed Forces (Wehrmacht). Its greatest success was the A4, more commonly known as the V-2. ...
*
Amerika Bomber The ''Amerikabomber'' () project was an initiative of the German Ministry of Aviation (''Reichsluftfahrtministerium'') to obtain a long-range strategic bomber for the ''Luftwaffe'' that would be capable of striking the United States (specifical ...
*
Argus Fernfeuer {{infobox weapon , name = Fernfeuer , image = , caption = , origin = Germany , type = Long-range surface-to-surface missile; aerial mine-layer , is_explosive = y , is ...
*
Fieseler Fi 103R Reichenberg The Fieseler Fi 103R, code-named ''Reichenberg'', was German manned version of the V-1 flying bomb (more correctly known as the ''Fieseler Fi 103''). It was developed towards the end of the Second World War and, although it never entered service ...
– The piloted version of the V-1 *
Fritz X Fritz X was the most common name for a German guided anti-ship glide bomb used during World War II. ''Fritz X'' was the world's first precision guided weapon deployed in combat and the first to sink a ship in combat. ''Fritz X'' was a nickname us ...
*
Henschel Hs 293 The Henschel Hs 293 was a World War II German radio-guided glide bomb. It is the first operational anti-shipping missile, first used unsuccessfully on 25 August 1943 and then with increasing success over the next year, ultimately damaging or sink ...
*
Hewitt-Sperry Automatic Airplane The Hewitt-Sperry Automatic Airplane was a project undertaken during World War I to develop a flying bomb, or pilotless aircraft capable of carrying explosives to its target. It is considered by some to be a precursor of the cruise missile. Co ...
* Kettering "Bug" Aerial Torpedo *
List of German guided weapons of World War II During World War II, Nazi Germany developed many missile and precision-guided munition systems. These included the first cruise missile, the first short-range ballistic missile, the first guided surface-to-air missiles, and the first anti-ship mi ...
*
List of jet aircraft of World War II World War II was the first war in which jet aircraft participated in combat with examples being used on both sides of the conflict during the latter stages of the war. The first successful jet aircraft, the Heinkel He 178, flew only five days befo ...
*
List of missiles Below is a list of missiles, sorted alphabetically into large categories and subcategories by name and purpose. Other missile lists Types of missiles: * Conventional guided missiles ** Air-to-air missile ** Air-to-surface missile ** Anti-radiat ...
*
Ohka The Yokosuka MXY-7 was a purpose-built, rocket-powered human-guided ''kamikaze'' attack aircraft employed by Japan against Allied ships towards the end of the Pacific War during World War II. Although extremely fast, the very short range of t ...
*
Operation Paperclip Operation Paperclip was a secret United States intelligence program in which more than 1,600 German scientists, engineers, and technicians were taken from the former Nazi Germany to the U.S. for government employment after the end of World Wa ...
*
RAE Larynx The Royal Aircraft Establishment Larynx (from "Long Range Gun with Lynx engine") was an early British pilotless aircraft, to be used as a guided anti-ship weapon. Started in September 1925, it was an early cruise missile guided by an autopilot ...
*
Republic-Ford JB-2 The Republic-Ford JB-2, also known as the Thunderbug, KGW and LTV-N-2 Loon, was a United States copy of the German V-1 flying bomb. Developed in 1944, and planned to be used in the United States invasion of Japan (Operation Downfall), t ...
*
SCR-584 radar The SCR-584 (short for '' Set, Complete, Radio # 584'') was an automatic-tracking microwave radar developed by the MIT Radiation Laboratory during World War II. It was one of the most advanced ground-based radars of its era, and became one of th ...
*
V-1 flying bomb facilities To carry out the planned V-1 "flying bomb" attacks on the United Kingdom, Germany built a number of military installations including launching sites and depots. Some of the installations were huge concrete fortifications. The Allies became aware ...
*
V-2 rocket The V-2 (german: Vergeltungswaffe 2, lit=Retaliation Weapon 2), with the technical name ''Aggregat 4'' (A-4), was the world’s first long-range guided ballistic missile. The missile, powered by a liquid-propellant rocket engine, was developed ...
*
V-3 cannon The V-3 (german: Vergeltungswaffe 3, ("Vengeance Weapon 3") was a German World War II large-caliber gun working on the multi-charge principle whereby secondary propellant charges are fired to add velocity to a projectile. The Germans plan ...


References

Informational notes Citations Bibliography * * * * * * * * . * * * * * * * . * * * * * * * * * * * * Further reading * * * * * * . (1978, USA, Sky Book Press, )


External links

*
V-1 Launch Site


* ttp://www.warbirdsresourcegroup.org/LRG/v1.html Fi-103/V-1 "Buzz Bomb", from the Luftwaffe Resource Center website, hosted by The Warbirds Resource Group; with 42 photos
The Lambeth Archives, includes a sound recording of an incoming V-1, circa 1944

Swedish site (in English) with text and many details of the V-1 cruise missile and its supporting hardware
{{DEFAULTSORT:V-1 (Flying Bomb) Cruise missiles of Germany V-01 V-weapons World War II jet aircraft of Germany World War II guided missiles of Germany Single-engined jet aircraft Pulsejet-powered aircraft Mid-wing aircraft German inventions of the Nazi period Unmanned military aircraft of Germany Weapons and ammunition introduced in 1944 Aircraft first flown in 1942