STOBAR ("short take-off, barrier-arrested recovery") 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, barrier-arrested recovery" (CATOBAR).
Aircraft launch under their own power using a ski-jump to assist take-off (rather than using a catapult). However, the planes are conventional, rather than STOVL aircraft, and thus require arrestor wires to land on the ship. The STOBAR system is simpler to build than CATOBAR. As of 2018 [update] , it has been used widely on Russian, Indian, and Chinese carriers.
Compared to CATOBAR, STOBAR is less expensive to develop. It is easier to operate than a CATOBAR configuration, which requires large number of operators to launch the aircraft. The lack of any moving parts in a ski-jump makes it less expensive to maintain than a catapult. [1] [2] It does not require any additional system to generate force required to launch the aircraft, unlike CATOBAR where an external force is needed to be generated either from steam catapult [3] or Electromagnetic Aircraft Launch System (EMALS) [4] to launch the aircraft.
One major limitation of STOBAR configuration is that it only works with fighter aircraft that have a high thrust-to-weight ratio such as Su-33 or MiG-29K and thus limits the kind of aircraft that can be operated from the carrier. It is not known[ who? ] what restrictions ski-jump takeoff implies on maximal aircraft weight. According to some sources, in order to become airborne, the aircraft may be required to limit its weaponry and fuel package in order to reduce the launch weight of the aircraft. [1] [5] However, according to other sources, [6] the Super Hornet can take-off from a ski-jump with a significant weapons load. Using ski-jump can limit the ability to conduct sorties faster on STOBAR aircraft carrier. [7] STOBAR carriers must maintain a speed of 20–30 kn (37–56 km/h) in order to generate wind speed required on deck which is essential for conducting aircraft launch operations. [8]
As of July2024, three countries currently operate STOBAR-type carriers; Russia and China are the only countries that have built a STOBAR ship for operation, while both India and China have procured STOBAR ships that were built by Russia and have had them converted for their own use. India is in the process of inducting its first indigenous aircraft carrier which is undergoing extensive sea trials.
Class | Image | Origin | No. of ships | Propulsion | Displacement | Operator | Aircraft carried | Notes |
---|---|---|---|---|---|---|---|---|
Kuznetsov | Soviet Union | 1 | Steam turbine | 58,000 tons | Russian Navy | |||
1 | People's Liberation Army Navy | |||||||
Kiev (INS Vikramaditya) | Soviet Union | 1 | Steam turbine | 45,500 tons | Indian Navy | Built as STOVL carrier and converted to STOBAR | ||
Shandong | China | 1 | Steam turbine | 70,000 tons | People's Liberation Army Navy |
| Upgraded Kuznetsov type design, first aircraft carrier built in China | |
Vikrant | India | 1 | Gas turbine | 45,000 tonnes | Indian Navy | First aircraft carrier built in India [13] |
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 naval force to project air power worldwide without depending on local bases for staging aircraft operations. Carriers have evolved since their inception in the early twentieth century from wooden vessels used to deploy balloons to nuclear-powered warships that carry numerous fighters, strike aircraft, helicopters, and other types of aircraft. While heavier aircraft such as fixed-wing gunships and bombers have been launched from aircraft carriers, these aircraft have not landed on a carrier. By its diplomatic and tactical power, its mobility, its autonomy and the variety of its means, the aircraft carrier is often the centerpiece of modern combat fleets. Tactically or even strategically, it replaced the battleship in the role of flagship of a fleet. One of its great advantages is that, by sailing in international waters, it does not interfere with any territorial sovereignty and thus obviates the need for overflight authorizations from third-party countries, reduces the times and transit distances of aircraft and therefore significantly increases the time of availability on the combat zone.
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 Sukhoi Su-33 is a Soviet/Russian all-weather carrier-based twin-engine air superiority fighter designed by Sukhoi and manufactured by Komsomolsk-on-Amur Aircraft Production Association, derived from the Su-27 and initially known as the Su-27K. Compared with the Su-27, the Su-33 has a strengthened undercarriage and structure, folding wings and stabilators, all for carrier operations. The Su-33 has canards, and its wings are larger than the Su-27 for a slower stall speed. The Su-33 has upgraded engines and a twin nose wheel, and is air refuelable.
An aircraft catapult is a device used to allow aircraft to take off in a limited distance, typically from the deck of a vessel. They can also be installed on land-based runways, although this is rarely done. They are usually used on aircraft carriers as a form of assisted take off.
INS Vikramaditya is a modified Kiev-class aircraft carrier and the flagship of the Indian Navy. The carrier entered into service in 2013.
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. EMALS was first installed on the lead ship of the Gerald R. Ford-class aircraft carrier, USS Gerald R. Ford.
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CATOBAR 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 using arrestor wires.
The Indian Naval Air Arm is the aviation branch and a fighting arm of the Indian Navy which is tasked to provide an aircraft carrier-based strike capability, fleet air defence, maritime reconnaissance, and anti-submarine warfare.
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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.
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In aviation, a ski-jump is an upward-curved ramp that allows aircraft to take off from a runway that is shorter than the aircraft's required takeoff roll. By forcing the aircraft upwards, lift-off can be achieved at a lower airspeed than that required for sustained flight, while allowing the aircraft to accelerate to such speed in the air rather than on the runway. Ski-jumps are commonly used to launch airplanes from aircraft carriers that lack catapults.
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In our simulation, we discovered that not only could the Super Hornet take-off from a ski-jump, but could do so with a significant weapons load.