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A blockbuster bomb or cookie was one of several of the largest conventional
bomb A bomb is an explosive weapon that uses the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy. Detonations inflict damage principally through ground- and atmosphere-transmitted mechanica ...
s used in World War II by the
Royal Air Force The Royal Air Force (RAF) is the United Kingdom's air and space force. It was formed towards the end of the First World War on 1 April 1918, becoming the first independent air force in the world, by regrouping the Royal Flying Corps (RFC) a ...
(RAF). The term ''blockbuster'' was originally a name coined by the press and referred to a bomb which had enough explosive power to destroy an entire street or large building through the effects of
blast Blast or The Blast may refer to: *Explosion, a rapid increase in volume and release of energy in an extreme manner *Detonation, an exothermic front accelerating through a medium that eventually drives a shock front Film * ''Blast'' (1997 film), ...
in conjunction with
incendiary bombs Incendiary weapons, incendiary devices, incendiary munitions, or incendiary bombs are weapons designed to start fires or destroy sensitive equipment using fire (and sometimes used as anti-personnel weaponry), that use materials such as napalm, th ...
.


Design

The bombs then called ''Blockbusters'' were the RAF's HC (high capacity) bombs. These bombs had especially thin casings that allowed them to contain approximately three-quarters of their weight in explosive, with a 4000 lb bomb (nominal weight) containing about of explosive ( Amatol,
RDX RDX (abbreviation of "Research Department eXplosive") or hexogen, among other names, is an organic compound with the formula (O2N2CH2)3. It is a white solid without smell or taste, widely used as an explosive. Chemically, it is classified as a n ...
or
Torpex Torpex is a secondary explosive, 50% more powerful than TNT by mass. Torpex comprises 42% RDX, 40% TNT and 18% powdered aluminium. It was used in the Second World War from late 1942, at which time some used the names Torpex and RDX interchangeab ...
). Most
general-purpose bomb A general-purpose bomb is an air-dropped bomb intended as a compromise between blast damage, penetration, and fragmentation in explosive effect. They are designed to be effective against enemy troops, vehicles, and buildings. Characteristics ...
s, termed "medium capacity'" (MC) by the RAF, contained 50% explosive by weight, the rest being made up of the fragmentation casing. Larger Blockbusters were made later in the war, from the original version, up to . The 4000 lb High Capacity Mark I bomb – actual weight around – was a welded, cylindrical shell of thick steel. The body of the bomb was in diameter and long. The nose of the bomb was conical and a long lightweight, empty cylindrical tail with a closed end was fitted, for a total overall length of . A T-section steel beam was welded to the inner surface of the bomb to strengthen it. Subsequent Mark II and Mark III HC bombs differed in detail; the conical nose was replaced with a domed nose and the number of
fuze In military munitions, a fuze (sometimes fuse) is the part of the device that initiates function. In some applications, such as torpedoes, a fuze may be identified by function as the exploder. The relative complexity of even the earliest fuze de ...
s was increased from one to three to guarantee
detonation Detonation () is a type of combustion involving a supersonic exothermic front accelerating through a medium that eventually drives a shock front propagating directly in front of it. Detonations propagate supersonically through shock waves with s ...
. The Mark IV bomb did not have the T-section beam and the Mark V and Mark VI bombs were versions manufactured in the United States. The larger bomb was constructed from two sections, of a larger diameter, that fitted together with bolts. A version was created by adding a third 4000 lb section and should not be confused with the 12,000lb Tallboy ground-penetrating "earthquake" bomb. The 4000-lb high-capacity design was little more than a cylinder full of explosives: it was un
aerodynamic Aerodynamics, from grc, ἀήρ ''aero'' (air) + grc, δυναμική (dynamics), is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dyn ...
and did not have fins. By comparison the similar American "4,000 pound LC Bomb AN-M56" bomb was aerodynamically designed as other US bombs were, with a sheet metal tailfin assembly and shaped nose and aft sections. When fitted with a conical "nose piece" and a drum tail, the British "Blockbuster" bomb fell straight down. These bombs were designed for their blast effect, to cause damage to buildings, specifically to blow
roof tile A roof ( : roofs or rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temper ...
s off, so that the small
incendiary bomb Incendiary weapons, incendiary devices, incendiary munitions, or incendiary bombs are weapons designed to start fires or destroy sensitive equipment using fire (and sometimes used as anti-personnel weaponry), that use materials such as napalm, ...
s could reach the building interiors. In contrast to the American AN-M56 ordnance, the cylindrical "HC"-class British-design high capacity bombs were used only by the RAF, which was the only air force with bombers with
bomb bay The bomb bay or weapons bay on some military aircraft is a compartment to carry bombs, usually in the aircraft's fuselage, with "bomb bay doors" which open at the bottom. The bomb bay doors are opened and the bombs are dropped when over the ...
s large enough to hold them. In 1947 Alfred Cecil Brooks of Stourbridge was appointed a Member of the
Order of the British Empire The Most Excellent Order of the British Empire is a British order of chivalry, rewarding contributions to the arts and sciences, work with charitable and welfare organisations, and public service outside the civil service. It was established o ...
, for creating the Blockbuster, although his citation was worded "outstanding services to the King of a nature that cannot be revealed". The local newspaper referred to him as "Blockbuster Brooks".


Operational use

The first type of aircraft to carry bombs operationally was the
Wellington Wellington ( mi, Te Whanganui-a-Tara or ) is the capital city of New Zealand. It is located at the south-western tip of the North Island, between Cook Strait and the Remutaka Range. Wellington is the second-largest city in New Zealand by me ...
during a strike on
Emden Emden () is an independent city and seaport in Lower Saxony in the northwest of Germany, on the river Ems. It is the main city of the region of East Frisia and, in 2011, had a total population of 51,528. History The exact founding date of Em ...
in April 1941; carriage of the bomb required the bomb beam to be removed from the bomb bay and a slot cut in the bomb doors - the bomb protruded slightly through this and, on release, simply fell out through the hole. The bomb later became part of the standard bomb load of the RAF's heavy night bombers, as well as that of the
Mosquitoes Mosquitoes (or mosquitos) are members of a group of almost 3,600 species of small flies within the family Culicidae (from the Latin ''culex'' meaning " gnat"). The word "mosquito" (formed by ''mosca'' and diminutive ''-ito'') is Spanish for "lit ...
of the
Light Night Strike Force The Pathfinders were target-marking squadrons in RAF Bomber Command during World War II. They located and marked targets with flares, which a main bomber force could aim at, increasing the accuracy of their bombing. The Pathfinders were norma ...
, whose aircraft would sometimes bomb Berlin twice in one night, flown by two different crews. The 2,000-lb HC was used until the end of the war; use peaked in 1944 with over 16,000 dropped The and the could be carried only by the
Avro Lancaster The Avro Lancaster is a British Second World War heavy bomber. It was designed and manufactured by Avro as a contemporary of the Handley Page Halifax, both bombers having been developed to the same specification, as well as the Short Stirling, ...
which needed to be slightly modified with bulged bomb-bay doors. The first use of the HC was by 15 Squadron Lancasters against Berlin on 2 December 1943. Bad weather and other factors meant their effectiveness was not noted. The "cookie" was regarded as a particularly dangerous load to carry. Due to the airflow over the detonating pistols fitted in the nose, it would often explode even if dropped in a supposedly "safe" unarmed state. The Safety height above ground for dropping the "cookie" was ; any lower and the dropping aircraft risked being damaged by the explosion's atmospheric
shock wave In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through a med ...
:
617 Squadron Number 617 Squadron is a Royal Air Force aircraft squadron, originally based at RAF Scampton in Lincolnshire and currently based at RAF Marham in Norfolk. It is commonly known as "''The Dambusters''", for its actions during Operation Chastise ...
developed a technique of dropping a 1,000lb MC bomb just before a 12,000lb HC bomb; the shock wave from the 1,000lb explosion fired the pistols on the 12,000lb bomb to give an "air burst"; this technique was used successfully in attacks including the Michelin factory at Clermont-Ferrand in March 1944.


Post-war unexploded ordnance

An unusual dry period led to low river levels in the
Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , sour ...
in December 2011, exposing a 4,000-lb HC bomb in the riverbed near
Koblenz Koblenz (; Moselle Franconian: ''Kowelenz''), spelled Coblenz before 1926, is a German city on the banks of the Rhine and the Moselle, a multi-nation tributary. Koblenz was established as a Roman military post by Drusus around 8 B.C. Its name ...
. A radius of around the bomb site (containing about 45,000 people) was evacuated while the bomb was defused. Another unexploded blockbuster was found in
Dortmund Dortmund (; Westphalian nds, Düörpm ; la, Tremonia) is the third-largest city in North Rhine-Westphalia after Cologne and Düsseldorf, and the eighth-largest city of Germany, with a population of 588,250 inhabitants as of 2021. It is the l ...
in November 2013, requiring the evacuation of more than 20,000 people from the area. Other bombs were found and defused in Vicenza on 29 April 2001 and 25 April 2014. In 2001, defusing operations required the evacuation of 70,000 within a radius of , while in 2014 defusing operations required the evacuation of 30,000 within a radius of . On 19 December 2016, a British bomb identified as a 4,000-lb HC "blockbuster" was discovered in
Augsburg Augsburg (; bar , Augschburg , links=https://en.wikipedia.org/wiki/Swabian_German , label=Swabian German, , ) is a city in Swabia, Bavaria, Germany, around west of Bavarian capital Munich. It is a university town and regional seat of the ...
, Germany. It was defused on
Christmas Day Christmas is an annual festival commemorating the birth of Jesus Christ, observed primarily on December 25 as a religious and cultural celebration among billions of people around the world. A feast central to the Christian liturgical year, ...
, requiring evacuation of more than 54,000 people within a radius of 1.5 km. On 29 August 2017, another British HC 4000 bomb was discovered during construction work near the
Goethe University Goethe University (german: link=no, Johann Wolfgang Goethe-Universität Frankfurt am Main) is a university located in Frankfurt am Main, Germany. It was founded in 1914 as a citizens' university, which means it was founded and funded by the wealt ...
in
Frankfurt Frankfurt, officially Frankfurt am Main (; Hessian: , " Frank ford on the Main"), is the most populous city in the German state of Hesse. Its 791,000 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located on its ...
, requiring the evacuation of approximately 65,000 people within a radius of . This was the largest evacuation in Germany since the Second World War. On 8 April 2018, an HC 4000 bomb was discovered during gardening jobs in
Paderborn Paderborn (; Westphalian: ''Patterbuorn'', also ''Paterboärn'') is a city in eastern North Rhine-Westphalia, Germany, capital of the Paderborn district. The name of the city derives from the river Pader and ''Born'', an old German term for t ...
, near the local university, leading to the evacuation of 26,400 people while the bomb was defused.


Bombs


2,000-lb HC

Design of a 2,000 lb to meet requirements of similar size to existing 1900-lb GP bomb was by Vickers with parachute arrangements by the RAF; this was at the same time Woolwich was designing the 4000lb bomb. Actual case construction was by Great Western Railway Company. Live tests began at start of 1941; a few were used operationally in late 1941 with parachute dropping and delay timer. The parachute requirement was dropped and from early 1942 they were used with conventional tail. Improved Mark II and Mark III (with different fuse positions) followed in 1943. Actual weight was for Mark II and III with 71% charge to weight filling of 60/40 or 50/50 Amatol, RDX/TNT 60/40, or Torpex 2.


4,000-lb HC

* Mark I: first production design * Mark II: three nose pistols * Mark III: no side pistol pockets * Mark IV: no stiffening beam * Mark V: U.S. production * Mark VI: U.S. production Filling was Amatol,
RDX RDX (abbreviation of "Research Department eXplosive") or hexogen, among other names, is an organic compound with the formula (O2N2CH2)3. It is a white solid without smell or taste, widely used as an explosive. Chemically, it is classified as a n ...
/
TNT Trinitrotoluene (), more commonly known as TNT, more specifically 2,4,6-trinitrotoluene, and by its preferred IUPAC name 2-methyl-1,3,5-trinitrobenzene, is a chemical compound with the formula C6H2(NO2)3CH3. TNT is occasionally used as a reagen ...
,
Minol The VEB Kombinat Minol, founded on 1 January 1956, was the state-owned gasoline and lubricant reseller of the German Democratic Republic. The marketing name MINOL was invented in 1949, when Die Deutsche Kraftstoff- und Mineralölzentrale (DKM ...
, or
Torpex Torpex is a secondary explosive, 50% more powerful than TNT by mass. Torpex comprises 42% RDX, 40% TNT and 18% powdered aluminium. It was used in the Second World War from late 1942, at which time some used the names Torpex and RDX interchangeab ...
. In 1943, 25,000 of these were used; this rose to 38,000 in 1944. In 1945 up to the end of the war a further 25,000 were used.


8,000-lb HC

* Mk I * Mk II Actual weight with charge to weight ratio of 68%. Filling was 'Amatex 9' or 'Torpex 2'. Bombs were produced from 1942 to 1945.


12,000-lb HC

* Mk I * Mk II Charge weight ratio of 80%. Filling was Amatex or Torpex. 170 were produced in the last two years of the war.


Other uses


Air mines

During
The Blitz The Blitz was a German bombing campaign against the United Kingdom in 1940 and 1941, during the Second World War. The term was first used by the British press and originated from the term , the German word meaning 'lightning war'. The Germa ...
the
Germans , native_name_lang = de , region1 = , pop1 = 72,650,269 , region2 = , pop2 = 534,000 , region3 = , pop3 = 157,000 3,322,405 , region4 = , pop4 = ...
used
naval mine A naval mine is a self-contained explosive device placed in water to damage or destroy surface ships or submarines. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, any ve ...
s dropped with
parachute A parachute is a device used to slow the motion of an object through an atmosphere by creating drag or, in a ram-air parachute, aerodynamic lift. A major application is to support people, for recreation or as a safety device for aviators, wh ...
s as improvised blockbusters. Their fuse was triggered by the shock of landing, with the bomb exploding after a 17-second delay. As the bomb was not in a crater, the force of the blast would disperse laterally, causing extensive damage. The large raid on Coventry on 14–15 November 1940 included the use of 50 parachute naval mines, which caused extensive blast damage. The British called these devices ''air-mines'',Taylor, Fredrick; ''Dresden Tuesday 13 February 1945'', Pub Bloomsbury (first publication 2004, paperback 2005). . Page 120. a
calque In linguistics, a calque () or loan translation is a word or phrase borrowed from another language by literal word-for-word or root-for-root translation. When used as a verb, "to calque" means to borrow a word or phrase from another language w ...
of the German term '' Luftmine''. These types were used also during air raids on
Malta Malta ( , , ), officially the Republic of Malta ( mt, Repubblika ta' Malta ), is an island country in the Mediterranean Sea. It consists of an archipelago, between Italy and Libya, and is often considered a part of Southern Europe. It lies ...
, especially on its harbour areas.


See also

* Tallboy bomb * Grand Slam bomb *
Firebombing Firebombing is a bombing technique designed to damage a target, generally an urban area, through the use of fire, caused by incendiary devices, rather than from the blast effect of large bombs. In popular usage, any act in which an incendiary ...
*
Firestorm A firestorm is a conflagration which attains such intensity that it creates and sustains its own wind system. It is most commonly a natural phenomenon, created during some of the largest bushfires and wildfires. Although the term has been use ...
*
Pumpkin bomb Pumpkin bombs were conventional aerial bombs developed by the Manhattan Project and used by the United States Army Air Forces against Japan during World War II. It was a close replication of the Fat Man plutonium bomb with the same ballistic an ...
, test
Fat Man "Fat Man" (also known as Mark III) is the codename for the type of nuclear bomb the United States detonated over the Japanese city of Nagasaki on 9 August 1945. It was the second of the only two nuclear weapons ever used in warfare, the firs ...
atom bomb casings filled with nearly of Composition B explosive * SC 1800 ''Satan'', the rough German equivalent of the American AN-M56 general purpose "blockbuster". *
BLU-82 The BLU-82B/C-130 weapon system, known under program "Commando Vault" and nicknamed " Daisy Cutter" in Vietnam for its ability to flatten a section of forest into a helicopter landing zone, is an American conventional bomb, delivered from eith ...
*
MOAB Moab ''Mōáb''; Assyrian: 𒈬𒀪𒁀𒀀𒀀 ''Mu'abâ'', 𒈠𒀪𒁀𒀀𒀀 ''Ma'bâ'', 𒈠𒀪𒀊 ''Ma'ab''; Egyptian: 𓈗𓇋𓃀𓅱𓈉 ''Mū'ībū'', name=, group= () is the name of an ancient Levantine kingdom whose territ ...


References

; Citations ; Bibliography * *


External links


A 12,000lb HC blockbuster pictured in the factory minus-tail unit

A 12,000lb HC blockbuster being dropped

An 8,000lb HC blockbuster about to be loaded aboard a Lancaster
{{Use British English, date=February 2015 World War II aerial bombs of the United Kingdom Weapons and ammunition introduced in 1941