![F-15 Tail Hook](https://upload.wikimedia.org/wikipedia/commons/f/f6/F-15_Tail_Hook.jpg)
A tailhook, arresting hook, or arrester hook is a device attached to the
empennage
The empennage ( or ), also known as the tail or tail assembly, is a structure at the rear of an aircraft that provides stability during flight, in a way similar to the feathers on an arrow.Crane, Dale: ''Dictionary of Aeronautical Terms, third e ...
(rear) of some military
fixed-wing aircraft. The hook is used to achieve rapid
deceleration
In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by t ...
during
routine landings aboard
aircraft carrier
An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the capital ship of a fleet, as it allows a ...
flight deck
The flight deck of an aircraft carrier is the surface from which its aircraft take off and land, essentially a miniature airfield at sea. On smaller naval ships which do not have aviation as a primary mission, the landing area for helicopte ...
s at sea, or during emergency landings or aborted takeoffs at
properly equipped airports.
The tailhook was first demonstrated at sea on 18 January 1911 by the aviator
Eugene Ely
Eugene Burton Ely (October 21, 1886 – October 19, 1911) was an American aviation pioneer, credited with the first shipboard aircraft take off and landing.
Background
Ely was born in Williamsburg, Iowa, and raised in Davenport, Iowa. Having c ...
, having successfully landed aboard the
armored cruiser
The armored cruiser was a type of warship of the late 19th and early 20th centuries. It was designed like other types of cruisers to operate as a long-range, independent warship, capable of defeating any ship apart from a battleship and fast eno ...
USS ''Pennsylvania'' with the aid of the device. It was not until the early 1920s that a practical system, paired with deck-mounted
arresting gear
An arresting gear, or arrestor gear, is a mechanical system used to rapidly decelerate an aircraft as it lands. Arresting gear on aircraft carriers is an essential component of naval aviation, and it is most commonly used on CATOBAR and STOB ...
, was devised and put into use. During the 1930s, numerous vessels were thus equipped, permitting the use of increasingly heavy combat aircraft at sea during 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 opposi ...
. Following the introduction of
jet-powered
Jet propulsion is the propulsion of an object in one direction, produced by ejecting a jet of fluid in the opposite direction. By Newton's third law, the moving body is propelled in the opposite direction to the jet. Reaction engines operating o ...
aircraft during the 1950s, arrestor technology was further advanced to permit aircraft operating at greater speeds and weights to land aboard aircraft carriers. The system has continued to see widespread use into the twenty-first century.
History
On 18 January 1911, the aviator
Eugene Ely
Eugene Burton Ely (October 21, 1886 – October 19, 1911) was an American aviation pioneer, credited with the first shipboard aircraft take off and landing.
Background
Ely was born in Williamsburg, Iowa, and raised in Davenport, Iowa. Having c ...
flew his
Curtiss
Curtiss Aeroplane and Motor Company (1909 – 1929) was an American aircraft manufacturer originally founded by Glenn Hammond Curtiss and Augustus Moore Herring in Hammondsport, New York. After significant commercial success in its first decade ...
pusher airplane from the Tanforan airfield in
San Bruno, California
San Bruno ( Spanish for " St. Bruno") is a city in San Mateo County, California, United States, incorporated in 1914. The population was 43,908 at the 2020 United States Census. The city is between South San Francisco and Millbrae, adjacent to S ...
, and landed on a platform on the
armored cruiser
The armored cruiser was a type of warship of the late 19th and early 20th centuries. It was designed like other types of cruisers to operate as a long-range, independent warship, capable of defeating any ship apart from a battleship and fast eno ...
USS ''Pennsylvania'' anchored in
San Francisco Bay,
in the first recorded shipboard landing of an aircraft. This flight was also the first ever to use a tailhook system, which had been both designed and built by the circus performer and aviator
Hugh Robinson. Following the flight, Ely remarked to a reporter that: "It was easy enough. I think the trick could be successfully turned nine times out of ten." Roughly four months later, the United States Navy would requisition its first airplane, an occasion often viewed as a milestone of naval aviation.
While the system initially drew only limited attention, there was greater recognition of its merits following the outbreak of the
First World War
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
.
Naval planners acknowledged that, in order for airplanes to be viable naval assets, they would have to be able to both take off from and land on ships. During the Great War, the number of aviators of the United States Navy rose from 38 to 1,650, which engaged in numerous duties in support of the
Allies
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 ...
, specialising in
combat air patrol
Combat air patrol (CAP) is a type of flying mission for fighter aircraft. A combat air patrol is an aircraft patrol provided over an objective area, over the force protected, over the critical area of a combat zone, or over an air defense area, ...
s and
submarine spotting.
The capabilities of naval aviation expanded greatly during the late 1910s and early 1920s.
The first practical tail hook and
arrestor gear
An arresting gear, or arrestor gear, is a mechanical system used to rapidly decelerate an aircraft as it lands. Arresting gear on aircraft carriers is an essential component of naval aviation, and it is most commonly used on CATOBAR and STOBA ...
arrangement was devised during this time; on 1 April 1922, the US Navy issued a request for the design of an arresting gear to equip a pair of
aircraft carrier
An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the capital ship of a fleet, as it allows a ...
s, the and .
During early 1930, the US Navy began development of an adjustable
hydraulic
Hydraulics (from Greek: Υδραυλική) is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counte ...
-based arresting gear arrangement, which proved capable of absorbing the energy of aircraft landing not only at higher speeds but greater weights as well.
As military aircraft continued to grow in terms of both weight and sortie rates during 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 opposi ...
, naval air wings were compelled to continue innovating and improving their aircraft recovery systems. Throughout the 1950s, as a consequence of the introduction of
jet aircraft to operations aboard aircraft carriers, both the landing speeds and tailhook loads increased substantially.
![E-1B tailhook](https://upload.wikimedia.org/wikipedia/commons/f/fb/E-1B_tailhook.jpg)
The US Navy developed and operated a test rig throughout the 1950s, consisting of a car, guided by a concrete I-beam and propelled by a pair of jet engines. At the end of a one-mile run, the tailhook under test would engage an arresting wire, while the I-beam guide gradually widened to slow down the test car after it passed the arresting wire, acting as a safeguard in the event of arrestor failure. The test rig was capable of simulating different aircraft weights and speeds, the former being adjusted by adding or subtracting
steel plates that were loaded onto the modified car. During 1958, further testing took place using an arrangement of four
Allison J33
The General Electric/Allison J33 is a development of the General Electric J31, enlarged to produce significantly greater thrust, starting at and ending at with an additional low-altitude boost to with water-alcohol injection.
Development
Th ...
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, an ...
engines.
[ These trials supported efforts to develop increasingly effective arrestor gear that was suited for the larger and more powerful jets entering naval aviation at that time.]
While the tailhook is predominantly operated in a naval context, numerous land-based aircraft have also been fitted with them to assist with slowing down landings during emergencies. One highly unorthodox incident, known as "Pardo's Push", occurred during the Vietnam War
The Vietnam War (also known by other names) was a conflict in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. It was the second of the Indochina Wars and was officially fought between North Vietnam a ...
in March 1967, involving a United States Air Force
The United States Air Force (USAF) is the Aerial warfare, air military branch, service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part ...
McDonnell Douglas F-4 Phantom II
The McDonnell Douglas F-4 Phantom II is an American tandem two-seat, twin-engine, all-weather, long-range supersonic jet interceptor and fighter-bomber originally developed by McDonnell Aircraft for the United States Navy.Swanborough and B ...
piloted by Bob Pardo assisting a second heavily damaged Phantom II in exiting the combat zone by pushing his aircraft against the other's deployed tailhook, reportedly halving its rate of descent temporarily.
In the twenty-first century, the tailhook has remained a part of the principal means of landing aircraft at sea for several navies, including the US Navy. During the 2000s, the Dassault Rafale
The Dassault Rafale (, literally meaning "gust of wind", and "burst of fire" in a more military sense) is a French twin-engine, canard delta wing, multirole fighter aircraft designed and built by Dassault Aviation. Equipped with a wide range ...
, a French multirole fighter, became the only non-US fighter type cleared to operate from the decks of US carriers, using catapults and their arresting gear
An arresting gear, or arrestor gear, is a mechanical system used to rapidly decelerate an aircraft as it lands. Arresting gear on aircraft carriers is an essential component of naval aviation, and it is most commonly used on CATOBAR and STOB ...
, as demonstrated in 2008 when six Rafales from ''Flottille 12F'' integrated into the Carrier Air Wing interoperability exercise. During the 2010s, new software trialled with the Boeing F/A-18E/F Super Hornet
The Boeing F/A-18E and F/A-18F Super Hornet are twin-engine, carrier-capable, multirole fighter aircraft variants based on the McDonnell Douglas F/A-18 Hornet. The F/A-18E single-seat and F/A-18F tandem-seat variants are larger and more ad ...
fighter reportedly showed promise in simplifying carrier landings.
During flight testing of the new Lockheed Martin F-35 Lightning II
The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, all-weather Stealth aircraft, stealth multirole combat aircraft that is intended to perform both Air superiority fighter, air superiority and attack ...
, one of the serious deficiencies that necessitated redesigns and delays was the failure of the navy's F-35C variant to catch the arresting wire in all eight landing tests; the tail hook had to be redesigned over a two-year period. Deficiencies have also been identified with the land-based F-35A's emergency tailhook. On 3 November 2014, the first successfully arrested landing of the F-35C was performed.
Description and operation
The tailhook is a strong metal bar, with its free end flattened out, thickened somewhat, and fashioned into a claw-like hook. The hook is mounted on a swivel on the keel of the aircraft, and is normally mechanically and hydraulically held in the stowed/up position. Upon actuation by the pilot, hydraulic
Hydraulics (from Greek: Υδραυλική) is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counte ...
or pneumatic pressure lowers the hook to the down position. The presence of a tailhook is not evidence of an aircraft's aircraft carrier suitability. Carrier aircraft hooks are designed to be quickly raised by the pilot after use.
A large number of land-based fighters are also outfitted with tailhooks, which are intended for use in case of a brake/tire malfunctions, aborted takeoffs, or other emergencies. Land-based aircraft landing gear and tailhooks are typically not strong enough to absorb the impact of a carrier landing, and some land-based tailhooks are held down with nitrogen
Nitrogen is the chemical element with the symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens. It is a common element in the universe, estimated at se ...
pressure systems that must be recharged by ground personnel after actuation.
Arresting gear
Both carrier- and land-based arresting gear consists of one or more cables (aka “arresting wires” or “cross deck pendants”) stretched across the landing area and attached on either end to arresting gear engines through “purchase cables”. In a typical carrier deck configuration, a total of four arrestor wires are present. The tailhook's function is to snag one of these cables, preferably the third of the four available, in order that the resistance provided by the arrestor gear can be conveyed to the aircraft, enabling it to decelerate more rapidly.
Method
Prior to making an "arrested landing", the pilot lowers the hook so that it will contact the ground as the aircraft wheels touch down. The hook then drags along the surface until an arresting cable, stretched across the landing area, is engaged. The cable lets out, transferring the energy of the aircraft to the arresting gear through the cable. A "trap" is often-used slang for an arrested landing. An aircraft which lands beyond the arresting cables is said to have " boltered." Occasionally, the tailhook bounces over one or more of the wires, resulting in a "hook skip bolter."
In the case of an aborted land-based takeoff, the hook can be lowered at some point (typically about 1000 feet) prior to the cable. Should a tailhook of an aircraft become inoperative or damaged, naval aviators have limited options: they can divert to shore-based runways if any are within range, or they can be " barricaded" on the carrier deck by a net that can be erected.
See also
* Arresting gear
An arresting gear, or arrestor gear, is a mechanical system used to rapidly decelerate an aircraft as it lands. Arresting gear on aircraft carriers is an essential component of naval aviation, and it is most commonly used on CATOBAR and STOB ...
* Carrier-based aircraft
* List of United States Navy aircraft designations (pre-1962)
This list of United States Navy aircraft designations (pre-1962) includes prototype, pre-production and operational type designations under the 1922 United States Navy aircraft designation system, which was used by the United States Navy, the Un ...
/ List of United States naval aircraft
The list of United States naval aircraft contains types currently used by United States Navy and the United States Marine Corps. For a complete list of naval aircraft designated under pre-1962 United States Navy designation systems, see List of U ...
* Brodie landing system
The Brodie landing system was a unique method of launching and landing light aircraft that was devised by Captain James H Brodie, James H. Brodie, a member of the United States Army Air Forces during World War II. The novel system involved Arresti ...
* Military aviation
* Modern United States Navy carrier air operations
Modern United States Navy aircraft carrier air operations include the operation of fixed-wing and rotary aircraft on and around an aircraft carrier for performance of combat or noncombat missions. The flight operations are highly evolved, b ...
* NATOPS
* Naval aviation
Naval aviation is the application of military air power by navies, whether from warships that embark aircraft, or land bases.
Naval aviation is typically projected to a position nearer the target by way of an aircraft carrier. Carrier-based ...
* United States Marine Corps Aviation
United States Marine Corps Aviation (USMCA) is the aircraft arm of the United States Marine Corps. Aviation units within the Marine Corps are assigned to support the Marine Air-Ground Task Force, as the aviation combat element, by providing si ...
* United States Naval Aviator
A naval aviator is a commissioned officer or warrant officer qualified as a crewed aircraft pilot in the United States Navy or United States Marine Corps. United States Coast Guard crewed aircraft pilots are officially designated as "Coast Guar ...
References
Citations
Bibliography
* United States Air Force
''Guide To Mobile Aircraft Arresting System Installation''.
Retrieved on 3 November 2007.
External links
Aircraft carriers of the USA Navy
{{Aircraft components
Naval aviation technology
Aircraft tail components