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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, based on experiences dating back to 1922 with USS Langley.
On an aircraft carrier flight deck, specialised crew are employed for the different roles utilised in managing air operations. The different flight deck crews wear colored jerseys to visually distinguish their functions.
Everyone associated with the flight deck has a specific job, which is indicated by the color of his or her deck jersey, float coat and helmet.Rank is also denoted by the pattern of trousers worn by flight deck crew:
When a Distinguished Visitor (DV) arrives on the ship by air, a call to "Muster the Rainbow Sideboys" is made. Typically two of each colored jersey stand opposite each other in front of the entrance to the ship to render honors to the DV. These sailors in their colored jerseys are referred to as "Rainbow Sideboys".
Also known as the air boss, the air officer (along with his assistant, the miniboss) is responsible for all aspects of operations involving aircraft including the hangar deck, the flight deck, and airborne aircraft out to 5 nautical miles (9.3 km; 5.8 mi) from the carrier. From his perch in Primary Flight Control (PriFly, or the "tower"), he, along with his assistant, maintains visual control of all aircraft operating in the carrier control zone (surface to and including 2,500 feet (760 m), within a circular limit defined by 5 nautical miles (9.3 km; 5.8 mi) horizontal radius from the carrier), and aircraft desiring to operate within the control zone must obtain his approval prior to entry. This officer is typically a Commander and is normally a former CVW squadron commander who was not selected for major command.
The normal working jersey color of an air boss is yellow, but an air boss may wear any color jersey he pleases, as he represents everyone working on the flight deck, hangar bay, and aviation fuels personnel.
Also known as shooters, catapult officers are naval aviators or naval flight officers, and are responsible for all aspects of catapult maintenance and operation. They ensure that wind (direction and speed) is sufficient over the deck and that the steam settings for the catapults will ensure that aircraft have sufficient flying speed at the end of the stroke.They are also responsible for signaling to the pilot that he or she may take off.
Also known as the aircraft handler (ACHO, or just handler), the ACHO is responsible for arrangement of aircraft about the flight and hangar decks. The handler is charged with avoiding a "locked deck", where too many misplaced aircraft are around such that no more can land prior to a rearrangement.The handler works in Flight Deck Control, where scale-model aircraft on a flight deck representation are used to represent actual aircraft status on the flight deck.
Aircraft directors, as their name implies, are responsible for directing all aircraft movement on the hangar and flight decks. They are enlisted aviation boatswain's mates.They are colloquially known as "bears" and those who work in the hangar go by the term "hangar rats". On some carriers, commissioned officers known as flight deck officers also serve as aircraft directors. During flight operations or during a flight deck "respot", typically about 12–15 yellowshirts are on the flight deck, and they report directly to the "handler". Although aircraft directors are often used at airports ashore, their function is particularly crucial in the confined flight deck environment where aircraft are routinely taxied within inches of one another, often with the ship rolling and pitching beneath. Directors wear yellow and use a complex set of hand signals (lighted yellow wands at night) to direct aircraft.
The landing signal officer (LSO) is a qualified, experienced pilot who is responsible for the visual control of aircraft in the terminal phase of the approach immediately prior to landing. LSOs ensure that approaching aircraft are properly configured, and they monitor aircraft glidepath angle, altitude, and lineup. They communicate with landing pilots by voice radio and light signals.
The arresting gear officer is responsible for arresting gear operation, settings, and monitoring landing area deck status (the deck is either "clear" and ready to land aircraft or "foul" and not ready for landing). Arresting gear engines are set to apply varying resistance (weight setting) to the arresting cable based on the type of aircraft landing.
Cyclic operations refers to the launch and recovery cycle for aircraft in groups or "cycles". Launching and recovering aircraft aboard aircraft carriers is best accomplished nonconcurrently, and cyclic operations are the norm for U.S. aircraft carriers. Cycles are generally about one and a half hours long, although cycles as short as an hour or as long as an hour and 45 minutes are not uncommon. The shorter the cycle, the fewer aircraft can be launched/recovered; the longer the cycle, the more critical fuel becomes for airborne aircraft.
"Events" are typically made up of about 12–20 aircraft and are sequentially numbered throughout the 24-hour fly day. Prior to flight operations, the aircraft on the flight deck are arranged ("spotted") so that Event 1 aircraft can easily be taxied to the catapults once they have been started and inspected. Once the Event 1 aircraft are launched (which takes generally about 15 minutes), Event 2 aircraft are readied for launch about an hour later (based on the cycle time in use). The launching of all these aircraft makes room on the flight deck to then land aircraft. Once Event 2 aircraft are launched, Event 1 aircraft are recovered, fueled, rearmed, respotted, and readied to be used for Event 3. Event 3 aircraft are launched, followed by the recovery of Event 2 aircraft (and so on throughout the fly day). After the last recovery of the day, all of the aircraft are generally stored on the bow (because the landing area aft needs to be kept clear until the last aircraft lands). They are then respotted about the flight deck for the next morning's first launch.
Departure and recovery operations are classified according to meteorological conditions into Case I, Case II, or Case III.
About 45 minutes before launch time, flight crews conduct walk-arounds and man assigned aircraft. Around 30 minutes prior to launch, preflight checks are conducted and aircraft engines are started. Roughly 15 minutes prior to launch, ready aircraft are taxied from their parked positions and spotted on or immediately behind the catapults. To assist the launch, the ship is turned into the natural wind. As an aircraft is taxied onto the catapult, the wings are spread and a large jet blast deflector panel rises out of the flight deck behind the engine exhaust. Prior to final catapult hookup, final checkers (inspectors) make final exterior checks of the aircraft, and loaded weapons are armed by ordnancemen.
Catapult hook up is accomplished by placing the aircraft launch bar, which is attached to the front of the aircraft's nose landing gear, into the catapult shuttle (which is attached to the catapult gear under the flight deck). An additional bar, the holdback, is connected from the rear of the nose landing gear to the carrier deck. The holdback fitting keeps the aircraft from moving forward prior to catapult firing. In final preparation for launch, a series of events happens in rapid succession, indicated by hand/light signals:
Once the catapult fires, the hold-back breaks free as the shuttle moves rapidly forward, dragging the aircraft by the launch bar. The aircraft accelerates from zero (relative to the carrier deck) to about 150 knots (280 km/h; 170 mph) in about 2 seconds. Typically wind (natural or ship motion generated) is blowing over the flight deck, giving the aircraft additional lift.
Procedures used after launch are based on meteorological and environmental conditions. Primary responsibility for adherence to the departure rests with the pilot; however, advisory control is given by the ship's departure control radar operators, including when dictated by weather conditions.
Aircraft are often launched from the carrier in a somewhat random order based on their deck positioning prior to launch. Therefore, aircraft working together on the same mission must rendezvous airborne. This is accomplished at a predetermined location, usually at the in-flight refueling tanker, overhead the carrier, or at an en route location. Properly equipped F/A-18E/F Super Hornets provide "organic" refueling, or U.S. Air Force (or other nations') tankers provide "nonorganic" tanking. After rendezvous/tanking, aircraft proceed on mission.
All aircraft within the carrier's radar coverage (typically several hundred miles) are tracked and monitored. As aircraft enter the carrier control area, a 50-nautical-mile radius (93 km; 58 mi) around the carrier, they are given more scrutiny. Once airwing aircraft have been identified, they are normally turned over to marshal control for further clearance to the marshal pattern.
As with departures, the type of recovery is based on the meteorological conditions:
If too many (more than six) aircraft are in the landing pattern when a flight arrives at the ship, the flight leader initiates a "spin", climbing up slightly and executing a tight 360° turn within 3 nautical miles (5.6 km; 3.5 mi) of the ship.
The break is a level, 180° turn made at 800 feet (240 m), descending to 600 feet (180 m) when established downwind. Landing gear/flaps are lowered, and landing checks are completed. When abeam (directly aligned with) the landing area on downwind, the aircraft is 180° from the ship's course and about 1.1 nautical miles (2.0 km; 1.3 mi) to 1.3 nautical miles (2.4 km; 1.5 mi) from the ship, a position known as "the 180" (because of the angled flight deck, which is actually closer to 190° of turn required at this point). The pilot begins his turn to final while simultaneously beginning a gentle descent. At "the 90" the aircraft is at 450 feet (140 m), about 1.2 nautical miles (2.2 km; 1.4 mi) from the ship, with 90° of turn to go. The final checkpoint for the pilot is crossing the ship's wake, at which time the aircraft should be approaching final landing heading and around 370 feet (110 m). At this point, the pilot acquires the optical landing system, which is used for the terminal portion of the landing. During this time, the pilot's full attention is devoted to maintaining proper glideslope, lineup, and angle of attack until touchdown.
Line up on landing area centerline is critical because it is only 120 feet (37 m) in width, and aircraft are often parked within a few feet of either side. This is accomplished visually during case I using the painted "ladder lines" on the sides of the landing area and the centerline/drop line (see graphic).
Flight leaders follow case-III approach procedures outside 10 nautical miles (19 km; 12 mi). When within 10 nmi with the ship in sight, flights are shifted to tower control and proceed as in case I.
All aircraft are assigned holding at a marshal fix, typically about 150° from the ship's base recovery course, at a unique distance and altitude. The holding pattern is a left-handed, 6-minute [ clarify ] Each pilot adjusts his holding pattern to depart marshal precisely at the assigned time. Aircraft departing marshal normally are separated by 1 minute. Adjustments may be directed by the ship's carrier air traffic control center, if required, to ensure proper separation. To maintain proper separation of aircraft, parameters must be precisely flown. Aircraft descend at 250 knots (460 km/h; 290 mph) and 4,000 feet per minute (1,200 m/min) until an elevation of 5,000 feet (1,500 m) is reached, when the descent is lessened to 2,000 feet per minute (610 m/min). Aircraft transition to a landing configuration (wheels/flaps down) at 10 nmi from the ship. If the stack is held more than 10° away from the final bearing (approach course to the ship), then at 12.5 nautical miles (23.2 km; 14.4 mi), the pilot will arc at 250 knots (460 km/h; 290 mph), and then intercept that final bearing, to proceed with the approach.
Since the landing area is angled about 10° from the axis of the ship, aircraft final approach heading (final bearing) is about 10° less than the ship's heading (base recovery course). Aircraft on the standard approach without an arc (called the CV-1) still have to correct from the marshal radial to the final bearing, and this is done in such case, at 20 nautical miles (37 km; 23 mi). As the ship moves through the water, the aircraft must make continual, minor corrections to the right to stay on the final bearing. If the ship makes course correction–which is often done to make the relative wind (natural wind plus ship's movement generated wind) go directly down the angle deck, or to avoid obstacles–lineup to center line must be corrected. The further the aircraft is from the ship, the larger the correction required.
Aircraft pass through the 6-nautical-mile (11 km; 6.9 mi) fix at 1,200 feet (370 m) altitude, 150 knots (280 km/h; 170 mph), in the landing configuration and commence slowing to final approach speed. At 3 nautical miles (5.6 km; 3.5 mi), aircraft begin a gradual (700-foot-per-minute (210 m/min) or 3–4°) descent until touchdown. To arrive precisely in position to complete the landing visually (at 3⁄4 nautical mile (1.4 km; 0.86 mi) behind the ship at 400 feet (120 m)), several instrument systems/procedures are used. Once the pilot acquires visual contact with the optical landing aids, the pilot will "call the ball". Control will then be assumed by the LSO, who issues final landing clearance with a "roger ball" call. When other systems are not available, aircraft on final approach continue their descent using distance/altitude checkpoints (e.g., 1,200 feet (370 m) at 3 nautical miles (5.6 km; 3.5 mi), 860 feet (260 m) at 2 nautical miles (3.7 km; 2.3 mi), 460 feet (140 m) at 1 nautical mile (1.9 km; 1.2 mi), 360 feet (110 m) at the "ball" call).
The carrier-controlled approach is analogous to ground-controlled approach using the ship's precision approach radar. Pilots are told (by voice radio) where they are in relation to glideslope and final bearing (e.g., "above glideslope, right of centerline"). The pilot then makes a correction and awaits further information from the controller.
The instrument carrier landing system (ICLS) is very similar to civilian instrument landing systems, and is used on virtually all case-III approaches. A "bullseye" is displayed for the pilot, indicating aircraft position in relation to glideslope and final bearing. The automatic carrier landing system is similar to the ICLS, in that it displays "needles" that indicate aircraft position in relation to glideslope and final bearing. An approach using this system is said to be a "mode II" approach. Additionally, some aircraft are capable of "coupling" their autopilots to the glideslope/azimuth signals received via data link from the ship, allowing for a "hands-off" approach. If the pilot keeps the autopilot coupled until touchdown, this is referred to as a "mode I" approach. If the pilot maintains a couple until the visual approach point (at 3⁄4 nautical mile (1.4 km; 0.86 mi)) this is referred to as a "mode IA" approach.
The long-range laser lineup system (LLS) uses eye-safe lasers, projected aft of the ship, to give pilots a visual indication of their lineup with relation to centerline. The LLS is typically used from as much as 10 nmi until the landing area can be seen around 1 nautical mile (1.9 km; 1.2 mi).
Regardless of the case recovery or approach type, the final portion of the landing (3⁄4 nautical mile (1.4 km; 0.86 mi) to touchdown) is flown visually. Line-up with the landing area is achieved by lining up painted lines on the landing area centerline with a set of lights that drops from the back of the flight deck. Proper glideslope is maintained using the Fresnel lens optical landing system (FLOLS), improved FLOLS, or manually operated OLS.
If an aircraft is pulled off the approach (the landing area is not clear, for example) or is waved off by the LSO (for poor parameters or a fouled deck), or misses all the arresting wires ("bolters"), the pilot climbs straight ahead to 1,200 feet (370 m) to the [ clarify ] and waits for instructions from approach control.
The pilot aims for the middle arresting wire, which is either the second or third depending on the configuration of the carrier. Upon touchdown, the throttles are advanced to military/full power for three seconds. This is done to keep the engines spooled and providing thrust in case a bolter (missing every wire, go-around) occurs or even for the unlikely event of a cable snapping. Afterwards, the throttles are reduced to idle, and the hook is raised on the aircraft director's signal. Ideally, the tailhook catches the target wire (or cross deck pendant), which abruptly slows the aircraft from approach speed to a full stop in about two seconds.
The aircraft director then directs the aircraft to clear the landing area in preparation for the next landing. Remaining ordnance is disarmed, wings are folded, and aircraft are taxied to parking spots and shut down. Immediately upon shutdown (or sometimes prior to that), the aircraft are refueled, rearmed, and inspected; minor maintenance is performed; and often respotted prior to the next launch cycle.
The purpose of carrier qualifications (CQ) is to give pilots a dedicated opportunity to develop fundamental skills associated with operating fixed-wing, carrier-based aircraft and demonstrate acceptable levels of proficiency required for qualification. During CQ, typically far fewer aircraft are on the flight deck than during cyclic operations. This allows for much easier simultaneous launch and recovery of aircraft. The waist catapults (located in the landing area) are generally not used. Aircraft can trap and be taxied immediately to a bow catapult for launch.
CQ is performed for new pilots and periodically for experienced pilots to gain/maintain carrier landing currency. Requirements (the number of landings/touch-and-goes required) are based on the experience of the pilot and the length of time since his last arrested landing.Civilian pilots can receive qualification; CIA pilots did so with the Lockheed U-2 in 1964.
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, it is currently not possible to land them. 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 increase the time of availability on the combat zone.
USS Takanis Bay (CVE-89) was a Casablanca-class escort carrier of the United States Navy, which served during World War II. She was named after Takanis Bay on the west side of Yakobi Island in Alaska. Launched in March 1944 and commissioned in April, she served as a carrier training vessel, operating off of San Diego. Following the end of hostilities, she repatriated troops from the Pacific theater as part of Operation Magic Carpet.
USS Lexington (CV-2), nicknamed "Lady Lex", was an early aircraft carrier built for the United States Navy. She was the lead ship of the Lexington class; her only sister ship, Saratoga, was commissioned a month earlier. Originally designed as a battlecruiser, she was converted into one of the Navy's first aircraft carriers during construction to comply with the terms of the Washington Naval Treaty of 1922, which essentially terminated all new battleship and battlecruiser construction. The ship entered service in 1928 and was assigned to the Pacific Fleet for her entire career. Lexington and Saratoga were used to develop and refine carrier tactics in a series of annual exercises before World War II. On more than one occasion these included successfully staged surprise attacks on Pearl Harbor, Hawaii. The ship's turbo-electric propulsion system allowed her to supplement the electrical supply of Tacoma, Washington, during a drought in late 1929 to early 1930. She also delivered medical personnel and relief supplies to Managua, Nicaragua, after an earthquake in 1931.
USS Hornet (CV-8), the seventh U.S. Navy vessel of that name, was a Yorktown-class aircraft carrier of the United States Navy. During World War II in the Pacific Theater, she launched the Doolittle Raid on Tokyo and participated in the Battle of Midway and the Buin-Faisi-Tonolai Raid. In the Solomon Islands campaign, she was involved in the capture and defense of Guadalcanal and the Battle of the Santa Cruz Islands where she was irreparably damaged by enemy torpedo and dive bombers. Faced with an approaching Japanese surface force, Hornet was abandoned and later torpedoed and sunk by approaching Japanese destroyers. Hornet was in service for a year and six days and was the last US fleet carrier ever sunk by enemy fire. For these actions, she was awarded four service stars, a citation for the Doolittle Raid in 1942, and her Torpedo Squadron 8 received a Presidential Unit Citation for extraordinary heroism for the Battle of Midway. Her wreck was located in late January 2019 near the Solomon Islands.
HMS Warrior was a Colossus-class light aircraft carrier which was ordered in 1942 by the British Royal Navy during World War II. Construction was finished in 1945 and upon completion, the aircraft carrier was loaned to the Royal Canadian Navy from 1946 to 1948 as HMCS Warrior. Warrior was returned to the Royal Navy in 1948 and entered service with the British. While in service with the Royal Navy, Warrior was modernised twice, including the installation of an angled flight deck in 1956. In 1948–1949, the ship was used in aircraft landing experiments and fitted with a rubber flight deck and in 1957, was used as the headquarters ship during nuclear testing at Christmas Island. In 1958, the vessel was sold to the Argentine Navy and entered Argentine service in 1959 as ARA Independencia. The aircraft carrier remained in service until 1970 when Independencia was placed in reserve. The following year, the ship was sold for scrap.
USS Midway (CVB/CVA/CV-41) is an aircraft carrier, formerly of the United States Navy, the lead ship of her class. Commissioned a week after the end of World War II, Midway was the largest ship in the world until 1955, as well as the first U.S. aircraft carrier too big to transit the Panama Canal. She operated for 47 years, during which time she saw action in the Vietnam War and served as the Persian Gulf flagship in 1991's Operation Desert Storm. Decommissioned in 1992, she is now a museum ship at the USS Midway Museum, in San Diego, California, and is the only remaining inactive U.S. aircraft carrier that is not an Essex-class aircraft carrier.
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 helicopters and other VTOL aircraft is also referred to as the flight deck. The official U.S. Navy term for these vessels is "air-capable ships".
The Implacable-class aircraft carrier was a class of two aircraft carriers built for the Royal Navy during World War II. Derived from the design of the Illustrious class, they were faster and carried more aircraft than the older ships. They were initially assigned to the Home Fleet when completed in 1944 and attacked targets in Norway as well as the German battleship Tirpitz. Subsequently, they were assigned to the British Pacific Fleet (BPF).
HMS Pioneer was a Colossus-class aircraft carrier built for the Royal Navy during World War II. She was modified whilst under construction into an aircraft maintenance carrier. The ship arrived in Australia in mid-1945 to support operations by the British Pacific Fleet against Japanese forces. She supported the British attacks on the Japanese Home Islands from mid-June until the end of the war in August from a base in the Admiralty Islands. The ship and her facilities were used to help repair Hong Kong's infrastructure in late 1945 and she returned to the UK in early 1946. Pioneer was immediately placed in reserve upon her arrival and she was sold in 1954 for scrap.
HMS Perseus was a Colossus-class light fleet aircraft carrier built for the Royal Navy during World War II. The ship was initially named HMS Edgar, but she was renamed in 1944 when the Admiralty decided to convert her into an aircraft maintenance carrier. She was completed in 1945, after the end of World War II, and she made a trip to Australia late in the year. Upon her return to the UK in early 1946, Perseus was placed in reserve. The ship was recommissioned in 1950 to serve as the trials ship for the steam catapult then under development. Over 1,600 test launches were conducted before the catapult was removed in 1952 and she was converted for use as a ferry carrier to transport aircraft, troops and equipment overseas. She was reduced to reserve again in 1954 and sold for scrap in 1958.
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 allow aircraft to take off from a very limited amount of space, such as the deck of a vessel, but also installed land-based runways in rare cases. It is now most commonly used on aircraft carriers, as a form of assisted take off.
A tailhook, arresting hook, or arrester hook is a device attached to the empennage (rear) of some military fixed-wing aircraft. The hook is used to achieve rapid deceleration during routine landings aboard aircraft carrier flight decks at sea, or during emergency landings or aborted takeoffs at properly equipped airports.
The Malta-class aircraft carrier was a British large aircraft carrier design of World War II. Four ships were ordered in 1943 for the Royal Navy, but changing tactical concepts, based on American experience in the Pacific War, caused repeated changes to the design, which was not completed before the end of the war. All four ships were cancelled in 1945 before they were laid down.
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 which 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.
A landing signal officer or landing safety officer (LSO), also informally known as paddles or batsman, is a naval aviator specially trained to facilitate the "safe and expeditious recovery" of naval aircraft aboard aircraft carriers. LSOs aboard smaller air capable ships that launch and recover helicopters are informally known as deck. Originally LSOs were responsible for bringing aircraft aboard ship using hand-operated signals. Since the introduction of optical landing systems in the 1950s, LSOs assist pilots by giving information via radio handsets.
The Graf Zeppelin-class aircraft carriers were four German Kriegsmarine aircraft carriers planned in the mid-1930s by Grand Admiral Erich Raeder as part of the Plan Z rearmament program after Germany and Great Britain signed the Anglo-German Naval Agreement. They were planned after a thorough study of Japanese carrier designs. German naval architects ran into difficulties due to lack of experience in building such vessels, the situational realities of carrier operations in the North Sea and the lack of overall clarity in the ships' mission objectives.
An optical landing system (OLS) is used to give glidepath information to pilots in the terminal phase of landing on an aircraft carrier.
Carrier-based aircraft, sometimes known as carrier-capable aircraft or carrier-borne aircraft, are naval aircraft designed for operations from aircraft carriers. They 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.
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.
A version of this article appeared in print on January 26, 2012, on page A6 of the New York edition with the headline: Potent Sting Is Prepared In the Belly Of a Warship.