CATOBAR (catapult-assisted take-off but arrested recovery [1] or catapult-assisted take-off barrier arrested recovery [2] ) is a system used for the launch and recovery of aircraft from the deck of an aircraft carrier. Under this technique, aircraft launch using a catapult-assisted take-off and land on the ship (the recovery phase) using arrestor wires.
Although this system is costlier than alternative methods, it provides greater flexibility in carrier operations, since it imposes less onerous design elements on fixed wing aircraft than alternative methods of launch and recovery such as STOVL or STOBAR, allowing for a greater payload for more ordnance and/or fuel. CATOBAR can launch aircraft that lack a high thrust to weight ratio, including heavier non-fighter aircraft such as the E-2 Hawkeye and Grumman C-2 Greyhound. [3] [4] [5]
The catapult system in use in most modern CATOBAR carriers is the steam catapult. Its primary advantage is the amount of power and control it can provide. During World War II the US Navy used a hydraulic catapult.
The United States and China completed the development of electromagnetic catapult to launch carrier-based aircraft using a linear motor drive instead of steam. The electromagnetic catapult is found on the American Gerald R. Ford-class carriers (the electromagnetic aircraft launch system) [6] and the Chinese carrier Fujian.
Following the decommissioning of Brazil's NAe São Paulo in February 2017, only three states currently operate carriers that use the CATOBAR system: the U.S. with its Nimitz-class and Gerald R. Ford-class, France with its Charles De Gaulle , and China with its Type-003 Fujian.
Class | Picture | Origin | No. of ships | Propulsion | Displacement | Operator | Aircraft carried | Catapult |
---|---|---|---|---|---|---|---|---|
Nimitz | United States | 10 | Nuclear | 100,020 t (220,510,000 lb) | F/A-18C Hornet F/A-18E/F Super Hornet F-35C Lightning II EA-18G Growler C-2 Greyhound E-2C/D Hawkeye | C-13-1 or C-13-2 steam | ||
Gerald R. Ford | United States | 1 | Nuclear | 100,000 t (220,000,000 lb) | United States Navy | F/A-18E/F Super Hornet F-35C Lightning II EA-18G Growler E-2D Hawkeye | EMALS | |
Charles de Gaulle | France | 1 | Nuclear | 42,500 t (93,700,000 lb) | French Navy | Rafale M E-2C Hawkeye | C-13-3 steam |
Class | Picture | Origin | No. of ships | Propulsion | Displacement | Operator | Aircraft carried | Catapult |
---|---|---|---|---|---|---|---|---|
Gerald R. Ford | United States | 2 | Nuclear | 100,000 t (220,000,000 lb) | United States Navy | F/A-18E/F Super Hornet F-35C Lightning II E-2D Hawkeye | EMALS | |
Fujian (Type 003) | China | 1 | Conventional | 80,000+ t | Shenyang J-15 Shenyang J-35 Xi'an KJ-600 Harbin Z-20 | EM catapult [7] | ||
Type 076 | China | 1 | Conventional | 48,000 t | People's Liberation Army Navy | Hongdu GJ-11 | EM catapult | |
PANG | France | 1 | Nuclear | 75,000 t | French Navy | Dassault Rafale M or FCAS | EMALS |
The Chinese Fujian (Type 003) features an integrated electric propulsion system that will allow the operation of electromagnetic catapults, similar to the Electromagnetic Aircraft Launch System (EMALS) used by the United States Navy. [8] [9]
INS Vishal, India's second indigenous aircraft carrier of the Vikrant-class, is planned to be of 65,000 ton displacement and to utilize the EMALS catapults developed by General Atomics, as it supports heavier fighters, AEW aircraft and UCAVs that cannot launch using a STOBAR ski jump ramps. [10]
Under Project Ark Royal, the Royal Navy plans to install catapults and arrestor equipment to its two STOVL-configured Queen Elizabeth-class aircraft carriers to launch and recover combat drones which are being procured under Project Vixen. [11]
An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering shipborne aircraft. Typically it is the capital ship of a fleet, as it allows a naval force to project seaborne air power far from homeland without depending on local airfields for staging aircraft operations. Since their inception in the early 20th century, aircraft carriers have evolved from wooden vessels used to deploy individual tethered reconnaissance balloons, to nuclear-powered supercarriers that carry dozens of fighters, strike aircraft, military helicopters, AEW&Cs and other types of aircraft such as UCAVs. While heavier fixed-wing aircraft such as airlifters, gunships and bombers have been launched from aircraft carriers, these aircraft have not landed on a carrier due to flight deck limitations.
The Kuznetsov-class aircraft carrying cruiser, Soviet designation Project 1143.5, is a class of STOBAR aircraft carriers operated by the Russian and Chinese navies. Originally designed for the Soviet Navy, the Kuznetsov-class ships use a ski-jump for launching high-performance jet aircraft and arrestor gears for landing. The design represented a major advance in Soviet fleet aviation over the Kiev-class carriers, which do not have full-length flight deck and could only launch VSTOL aircraft. The Soviet Union's classification for the class was as a heavy aircraft-carrying cruiser, which permits the ships to transit the Turkish Straits without violating the Montreux Convention. However, the Chinese variants are classified as aircraft carriers.
An electromagnetic catapult, also called EMALS after the specific US system, is a type of aircraft launching system. Currently, only the United States and China have successfully developed it, and it is installed on the Gerald R. Ford-class aircraft carriers and the Chinese aircraft carrier Fujian. The system launches carrier-based aircraft by means of a catapult employing a linear induction motor rather than the conventional steam piston.
The Queen Elizabeth-class aircraft carriers of the United Kingdom's Royal Navy consists of two vessels. The lead ship of her class, HMS Queen Elizabeth, was named on 4 July 2014 in honour of Elizabeth I and was commissioned on 7 December 2017. Her sister ship, HMS Prince of Wales, was launched on 21 December 2017, and was commissioned on 10 December 2019. They form the central components of the UK Carrier Strike Group.
The Gerald R. Ford-class nuclear-powered aircraft carriers are currently being constructed for the United States Navy, which intends to eventually acquire ten of these ships in order to replace current carriers on a one-for-one basis, starting with the lead ship of her class, Gerald R. Ford (CVN-78), replacing Enterprise (CVN-65), and later the Nimitz-class carriers. The new vessels have a hull similar to the Nimitz class, but they carry technologies since developed with the CVN(X)/CVN-21 program, such as the Electromagnetic Aircraft Launch System (EMALS), as well as other design features intended to improve efficiency and reduce operating costs, including sailing with smaller crews. This class of aircraft carriers is named after former U.S. President Gerald R. Ford. CVN-78 was procured in 2008 and commissioned into service on 22 July 2017. The second ship of the class, John F. Kennedy (CVN-79), is scheduled to enter service in 2025.
STOBAR is a system used for the launch and recovery of aircraft from the deck of an aircraft carrier, combining elements of "short take-off and vertical landing" (STOVL) with "catapult-assisted take-off but arrested recovery" (CATOBAR).
An aircraft catapult is a device used to help fixed-wing aircraft gain enough airspeed and lift for takeoff from a limited distance, typically from the deck of a ship. They are usually used on aircraft carrier flight decks as a form of assisted takeoff, but can also be installed on land-based runways, although this is rare.
An anti-submarine warfare carrier is a type of small aircraft carrier whose primary role is as the nucleus of an anti-submarine warfare hunter-killer group. This type of ship came into existence during the Cold War as a development of the escort carriers used in the ASW role in the North Atlantic during World War II.
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 STOBAR aircraft carriers. Similar systems are also found at land-based airfields for expeditionary or emergency use. Typical systems consist of several steel wire ropes laid across the aircraft landing area, designed to be caught by an aircraft's tailhook. During a normal arrestment, the tailhook engages the wire and the aircraft's kinetic energy is transferred to hydraulic damping systems attached below the carrier deck. There are other related systems that use nets to catch aircraft wings or landing gear. These barricade and barrier systems are only used for emergency arrestments for aircraft without operable tailhooks.
The Electromagnetic Aircraft Launch System (EMALS) is a type of electromagnetic catapult system developed by General Atomics for the United States Navy. The system launches carrier-based aircraft by means of a catapult employing a linear induction motor rather than the conventional steam piston, providing greater precision and faster recharge compared to steam. EMALS was first installed on the lead ship of the Gerald R. Ford-class aircraft carrier, USS Gerald R. Ford, c. 2015.
The Vikrant class is a class of aircraft carrier being built for the Indian Navy. The class represents the largest warships and the first aircraft carriers to be designed and built in India.
A carrier-based aircraft is a naval aircraft designed for operations from aircraft carriers. Carrier-based aircraft must be able to launch in a short distance and be sturdy enough to withstand the abrupt forces of launching from and recovering on a pitching deck. In addition, their wings are generally able to fold up, easing operations in tight quarters.
INS Vishal, also known as Indigenous Aircraft Carrier 3 (IAC-3), is a planned aircraft carrier to be built by Cochin Shipyard Limited for the Indian Navy. It is intended to be the third aircraft carrier to be built in India after INS Vikrant (IAC-1) and another Vikrant-class aircraft carrier, provisionally called (IAC-2). The proposed design of this class will be a new design, featuring significant changes from Vikrant, including an increase in size and displacement. An Electromagnetic Aircraft Launch System (EMALS) CATOBAR system is also under consideration. Its name Vishal means 'Gargantuan' in Sanskrit.
Aircraft have different ways to take off and land. Conventional airplanes accelerate along the ground until reaching a speed that is sufficient for the airplane to takeoff and climb at a safe speed. Some airplanes can take off at low speed, this being a short takeoff. Some aircraft such as helicopters and Harrier jump jets can take off and land vertically. Rockets also usually take off vertically, but some designs can land horizontally.
Fujian, named after Fujian province, is a Chinese aircraft carrier serving in the People's Liberation Army Navy. It is the third aircraft carrier of the Chinese aircraft carrier programme and the first of the Type 003 class. It succeeds the Type 002 Shandong which is described as a modified Kuznetsov-class aircraft carrier. It is China's first indigenously designed carrier, and its first capable of catapult-assisted take-offs (CATOBAR); previous Chinese carriers used ski-jumps (STOBAR).
In aviation, a ski-jump is an upwardly curved ramp that allows a fixed-wing aircraft to take off from a runway that is shorter than the aircraft normally requires. By providing an upward vector from the ski-jump's normal force, the aircraft is launched at an elevated angle and lift-off can be achieved at a lower airspeed than that required for flat takeoff, as it allows the aircraft more time to continue accelerating while airborne after leaving the runway. Ski-jumps are commonly used to launch shipborne aircraft from aircraft carriers that lack catapults.
The Type 076 landing helicopter dock is a class of drone-carrying amphibious assault ship for the Chinese People's Liberation Army Navy (PLAN). Compared to the Type 075, the Type 076 is significantly larger in both displacement and flight deck dimensions; it also has a CATOBAR system of electromagnetic catapult and arresting gears for operating light fixed-wing aircraft, likely unmanned combat aerial vehicles (UCAV).
Project Vixen is the name of a Royal Navy programme examining the use of fixed-wing unmanned aerial vehicles (UAVs) from its two aircraft carriers. The project likely draws its name from the de Havilland Sea Vixen, notable for being the Royal Navy's first two-seat carrier-based aircraft capable of supersonic flight. The project is part of the navy's wider Future Maritime Aviation Force (FMAF) strategy to increase the use of uncrewed systems.