Aircraft carrier

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Four modern aircraft carriers of various types--USS John C. Stennis, Charles de Gaulle (French Navy), USS John F. Kennedy, helicopter carrier HMS Ocean--and escort vessels, 2002 Fleet 5 nations.jpg
Four modern aircraft carriers of various types—USS John C. Stennis, Charles de Gaulle (French Navy), USS John F. Kennedy, helicopter carrier HMS Ocean—and escort vessels, 2002

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. [1] 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.

Contents

Chart comparing a range of aircraft carriers, from longest (top left) to shortest World Navy Aircraft carries chart.svg
Chart comparing a range of aircraft carriers, from longest (top left) to shortest

There is no single definition of an "aircraft carrier", [2] and modern navies use several variants of the type. These variants are sometimes categorized as sub-types of aircraft carriers, [3] and sometimes as distinct types of naval aviation-capable ships. [2] [4] Aircraft carriers may be classified according to the type of aircraft they carry and their operational assignments. Admiral Sir Mark Stanhope, RN, former First Sea Lord (head) of the Royal Navy, has said, "To put it simply, countries that aspire to strategic international influence have aircraft carriers." [5] Henry Kissinger, while United States Secretary of State, also said: "An aircraft carrier is 100,000 tons of diplomacy." [6]

Comparison of aircraft carriers Aircraft carrier comparison.jpg
Comparison of aircraft carriers

As of July 2021, there are 45 active aircraft carriers in the world operated by fourteen navies. The United States Navy has 11 large nuclear-powered fleet carriers—carrying around 80 fighters each—the largest carriers in the world; the total combined deck space is over twice that of all other nations combined. [7] As well as the aircraft carrier fleet, the US Navy has nine amphibious assault ships used primarily for helicopters, although these also each carry up to 20 vertical or short take-off and landing (V/STOL) fighter jets and are similar in size to medium-sized fleet carriers. The United Kingdom and China each operate two aircraft carriers. France, India, and Russia each operate a single aircraft carrier with a capacity of 30 to 60 fighter jets. Italy operates two light fleet carriers and Spain operates one. Helicopter carriers are operated by Japan (4, two of which are being converted to operate V/STOL fighters), France (3), Australia (2), Egypt (2), South Korea (1), Thailand (1), Brazil (1) and China (1). Future aircraft carriers are under construction or in planning by Brazil, China, France, India, Russia, South Korea and the US.

Types of carriers

French aircraft carrier Charles de Gaulle (rear), and US Navy carrier USS Ronald Reagan conducting joint operations in the Persian Gulf; both with the CATOBAR configuration. US Navy 060427-N-5961C-009 USS Ronald Reagan (CVN 76),FS Charles De Gaulle (R-92),FS Cassard (D-614), guided missile cruiser USS Vicksburg (CG 69), USS McCampbell (DDG 85) conduct joint operations in the Persian Gulf.jpg
French aircraft carrier Charles de Gaulle (rear), and US Navy carrier USS Ronald Reagan conducting joint operations in the Persian Gulf; both with the CATOBAR configuration.

General features

Basic types

(Note: Some of the types listed here are not strictly defined as aircraft carriers by some sources.)

By role

INS Vikramaditya of the Indian Navy has the STOBAR configuration. INS Vikramaditya (R33) close shot.jpg
INS Vikramaditya of the Indian Navy has the STOBAR configuration.

A fleet carrier is intended to operate with the main fleet and usually provides an offensive capability. These are the largest carriers capable of fast speeds. By comparison, escort carriers were developed to provide defense for convoys of ships. They were smaller and slower with lower numbers of aircraft carried. Most were built from mercantile hulls or, in the case of merchant aircraft carriers, were bulk cargo ships with a flight deck added on top. Light aircraft carriers were fast enough to operate with the main fleet but of smaller size with reduced aircraft capacity.

The Soviet aircraft carrier Admiral Kusnetsov was termed a heavy aircraft-carrying cruiser. This was primarily a legal construct to avoid the limitations of the Montreux Convention preventing 'aircraft carriers' transiting the Turkish Straits between the Soviet Black Sea bases and the Mediterranean. These ships, while sized in the range of large fleet carriers, were designed to deploy alone or with escorts. In addition to supporting fighter aircraft and helicopters, they provide both strong defensive weaponry and heavy offensive missiles equivalent to a guided-missile cruiser.

By configuration

Aircraft carriers today are usually divided into the following four categories based on the way that aircraft take off and land:

By size

Supercarrier

The Japanese carrier Shinano was the biggest carrier in World War II, and the largest ship destroyed by a submarine. Japanese aircraft carrier Shinano.jpg
The Japanese carrier Shinano was the biggest carrier in World War II, and the largest ship destroyed by a submarine.

The appellation "supercarrier" is not an official designation with any national navy, but a term used predominantly by the media and typically when reporting on new and upcoming aircraft carrier types. It is also used when comparing carriers of various sizes and capabilities, both current and past. It was first used by The New York Times in 1938, [11] in an article about the Royal Navy's HMS Ark Royal, that had a length of 209 meters (686 ft), a displacement of 22,000 tonnes and was designed to carry 72 aircraft. [12] [13] Since then, aircraft carriers have consistently grown in size, both in length and displacement, as well as improved capabilities; in defense, sensors, electronic warfare, propulsion, range, launch and recovery systems, number and types of aircraft carried and number of sorties flown per day.

The largest "supercarriers" in service as of 2021 are with the US Navy, [14] with displacements exceeding 100,000 tonnes, [14] lengths of over 337 meters (1,106 ft), [14] and capabilities that match or exceed that of any other class. [20]

China, Russia, and the United Kingdom all have carriers in service or under construction with displacements ranging from 65,000 [9] to 85,000 tonnes, [21] lengths from 280 meters (920 ft) [22] to 320 meters (1,050 ft) [23] which have been described as "supercarriers". [26]

Hull type identification symbols

Several systems of identification symbol for aircraft carriers and related types of ship have been used. These include the pennant numbers used by the Royal Navy, Commonwealth countries, and Europe, along with the hull classification symbols used by the US and Canada. [27]

US hull classification symbols for aircraft carriers and related types
SymbolDesignation
CVGeneric aircraft carrier
CVAAttack carrier
CVBLarge aircraft carrier (retired)
CVANNuclear-powered attack carrier
CVE Escort carrier
CVG Flight deck cruiser (proposed)
CVHAAircraft carrier, Helicopter Assault (retired)
CVHEAircraft carrier, Helicopter, Escort (retired)
CVV Aircraft Carrier (Medium) (proposed)
CVL Light aircraft carrier
CVNNuclear-powered aircraft carrier
CVS Anti-submarine warfare carrier
CVTTraining Aircraft Carrier
LHA Landing Helicopter Assault, a type of amphibious assault ship
LHD Landing Helicopter Dock, a type of amphibious assault ship
LPH Landing Platform Helicopter, a type of amphibious assault ship

History

Origins

The Japanese seaplane carrier Wakamiya conducted the world's first naval-launched air raids in 1914 Wakamiya.jpg
The Japanese seaplane carrier Wakamiya conducted the world's first naval-launched air raids in 1914

The 1903 advent of heavier-than-air fixed-wing airplane with the Wright brothers' first flight at Kitty Hawk, North Carolina, was closely followed on 14 November 1910, by Eugene Burton Ely's first experimental take-off of a Curtiss Pusher airplane from the deck of a United States Navy ship, the cruiser USS Birmingham anchored off Norfolk Navy Base in Virginia. Two months later, on 18 January 1911, Ely landed his Curtiss Pusher airplane on a platform on the armored cruiser USS Pennsylvania anchored in San Francisco Bay. On 9 May 1912, the first airplane take-off from a ship underway was made from the deck of the Royal Navy's pre-dreadnought battleship HMS Hibernia. [28] [29] Seaplane tender support ships came next, with the French Foudre of 1911.

Early in World War I, the Imperial Japanese Navy ship Wakamiya conducted the world's first successful ship-launched air raid: [30] [31] on 6 September 1914, a Farman aircraft launched by Wakamiya attacked the Austro-Hungarian cruiser SMS Kaiserin Elisabeth and the Imperial German gunboat Jaguar in Kiaochow Bay off Tsingtao; neither was hit. [32] [33] The first attack using an air-launched torpedo occurred on 2 August, when a torpedo was fired by Flight Commander Charles H. K. Edmonds from a Short Type 184 seaplane, launched from the seaplane carrier HMS Ben-my-Chree. [34] [35] The first carrier-launched airstrike was the Tondern raid in July 1918. Seven Sopwith Camels launched from the converted battlecruiser HMS Furious damaged the German airbase at Tondern, Germany (modern day Tønder, Denmark) and destroyed two zeppelin airships. [36] The development of flattop vessels produced the first large fleet ships. In 1918, HMS Argus became the world's first carrier capable of launching and recovering naval aircraft. [37]

As a result of the Washington Naval Treaty of 1922, which limited the construction of new heavy surface combat ships, most early aircraft carriers were conversions of ships that were laid down (or had served) as different ship types: cargo ships, cruisers, battlecruisers, or battleships. These conversions gave rise to the US Lexington-class aircraft carriers (1927), Japanese Akagi and Kaga, and British Courageousclass. Specialist carrier evolution was well underway, with several navies ordering and building warships that were purposefully designed to function as aircraft carriers by the mid-1920s. This resulted in the commissioning of ships such as the Japanese Hōshō (1922), [38] HMS Hermes (1924, although laid down in 1918 before Hōshō), and Béarn (1927). During World War II, these ships would become known as fleet carriers.[ citation needed ]

World War II

The Royal Navy's HMS Ark Royal in 1939, with Swordfish biplane bombers passing overhead. The British aircraft carrier was involved in the crippling of the German battleship Bismarck in May 1941 HMS Ark Royal h85716.jpg
The Royal Navy's HMS Ark Royal in 1939, with Swordfish biplane bombers passing overhead. The British aircraft carrier was involved in the crippling of the German battleship Bismarck in May 1941
USS Enterprise, the most decorated US warship of World War II USS Enterprise (CV-6) in Puget Sound, September 1945.jpg
USS Enterprise, the most decorated US warship of World War II

The aircraft carrier dramatically changed naval warfare in World War II, because air power was becoming a significant factor in warfare. The advent of aircraft as focal weapons was driven by the superior range, flexibility, and effectiveness of carrier-launched aircraft. They had greater range and precision than naval guns, making them highly effective. The versatility of the carrier was demonstrated in November 1940, when HMS Illustrious launched a long-range strike on the Italian fleet at their base in Taranto, signalling the beginning of the effective and highly mobile aircraft strikes. This operation in the shallow water harbor incapacitated three of the six anchored battleships at a cost of two torpedo bombers.

World War II in the Pacific Ocean involved clashes between aircraft carrier fleets. The Japanese surprise attack on the American Pacific fleet at Pearl Harbor naval and air bases on Sunday, 7 December 1941, was a clear illustration of the power projection capability afforded by a large force of modern carriers. Concentrating six carriers in a single unit turned naval history about, as no other nation had fielded anything comparable. Further versatility was demonstrated during the "Doolittle Raid", on 18 April 1942, when US Navy carrier USS Hornet sailed to within 650 nautical miles (1,200 km) of Japan and launched 16 B-25 bombers from her deck in a retaliatory strike on the mainland, including the capital, Tokyo. However, the vulnerability of carriers compared to traditional battleships when forced into a gun-range encounter was quickly illustrated by the sinking of HMS Glorious by German battleships during the Norwegian campaign in 1940.

This new-found importance of naval aviation forced nations to create a number of carriers, in efforts to provide air superiority cover for every major fleet in order to ward off enemy aircraft. This extensive usage led to the development and construction of 'light' carriers. Escort aircraft carriers, such as USS Bogue, were sometimes purpose-built but most were converted from merchant ships as a stop-gap measure to provide anti-submarine air support for convoys and amphibious invasions. Following this concept, light aircraft carriers built by the US, such as USS Independence, represented a larger, more "militarized" version of the escort carrier. Although with similar complement to escort carriers, they had the advantage of speed from their converted cruiser hulls. The UK 1942 Design Light Fleet Carrier was designed for building quickly by civilian shipyards and with an expected service life of about 3 years. [39] They served the Royal Navy during the war, and the hull design was chosen for nearly all aircraft carrier equipped navies after the war, until the 1980s. Emergencies also spurred the creation or conversion of highly unconventional aircraft carriers. CAM ships were cargo-carrying merchant ships that could launch (but not retrieve) a single fighter aircraft from a catapult to defend the convoy from long range land-based German aircraft.

Postwar era

An F6F-5 landing on the French Arromanches in the Tonkin Gulf, 1953. Arromanches (R95) with Hellcat landing c1953.jpg
An F6F-5 landing on the French Arromanches in the Tonkin Gulf, 1953.
USS Tripoli, a U.S. Navy Iwo Jima-class helicopter carrier USS Tripoli LPH10 a.jpg
USS Tripoli, a U.S. Navy Iwo Jima-class helicopter carrier
USS Enterprise (CVN-65), "The Big E", the world's first nuclear-powered carrier, commissioned in 1961 USS Enterprise (CVN-65) underway in the Atlantic Ocean on 14 June 2004 (040614-N-0119G-020).jpg
USS Enterprise (CVN-65), "The Big E", the world's first nuclear-powered carrier, commissioned in 1961

Before World War II, international naval treaties of 1922, 1930, and 1936 limited the size of capital ships including carriers. Since World War II, aircraft carrier designs have increased in size to accommodate a steady increase in aircraft size. The large, modern Nimitzclass of US Navy carriers has a displacement nearly four times that of the World War II–era USS Enterprise, yet its complement of aircraft is roughly the same—a consequence of the steadily increasing size and weight of individual military aircraft over the years. Today's aircraft carriers are so expensive that some nations which operate them risk significant economic and military impact if a carrier is lost. [40]

Some changes were made after 1945 in carriers:

Modern navies that operate such aircraft carriers treat them as the capital ship of the fleet, a role previously held by the sailing galleons, frigates and ships-of-the-line and later steam or diesel powered battleship. This change took place during World War II in response to air power becoming a significant factor in warfare, driven by the superior range, flexibility and effectiveness of carrier-launched aircraft. Following the war, carrier operations continued to increase in size and importance, and along with, carrier designs also increased in size and ability. Some of these larger carriers, dubbed by the media as "supercarriers", displacing 75,000 tonnes or greater, have become the pinnacle of carrier development. Some are powered by nuclear reactors and form the core of a fleet designed to operate far from home. Amphibious assault ships, such as the Wasp and Mistral classes, serve the purpose of carrying and landing Marines, and operate a large contingent of helicopters for that purpose. Also known as "commando carriers" [45] or "helicopter carriers", many have the capability to operate VSTOL aircraft.

The threatening role of aircraft carriers has a place in modern asymmetric warfare, like the gunboat diplomacy of the past. [46] Carriers also facilitate quick and precise projections of overwhelming military power into such local and regional conflicts. [47]

Lacking the firepower of other warships, carriers by themselves are considered vulnerable to attack by other ships, aircraft, submarines, or missiles. Therefore, an aircraft carrier is generally accompanied by a number of other ships to provide protection for the relatively unwieldy carrier, to carry supplies and perform other support services, and to provide additional offensive capabilities. The resulting group of ships is often termed a battle group, carrier group, carrier battle group or carrier strike group.

There is a view among some military pundits[ who? ] that modern anti-ship weapons systems, such as torpedoes and missiles, or even ballistic missiles with nuclear warheads have made aircraft carriers and carrier groups too vulnerable for modern combat. [48]

Carriers can also be vulnerable to diesel-electric submarines [ improper synthesis? ] like the German U24 of the conventional 206 class which in 2001 "fired" at the Enterprise during the exercise JTFEX 01-2 in the Caribbean Sea by firing flares and taking a photograph through its periscope [49] or the Swedish Gotland which managed the same feat in 2006 during JTFEX 06-2 by penetrating the defensive measures of Carrier Strike Group 7 which was protecting USS Ronald Reagan. [50]

Description

Structure

Carriers are large and long ships, although there is a high degree of variation depending on their intended role and aircraft complement. The size of the carrier has varied over history and among navies, to cater to the various roles that global climates have demanded from naval aviation.

Regardless of size, the ship itself must house their complement of aircraft, with space for launching, storing, and maintaining them. Space is also required for the large crew, supplies (food, munitions, fuel, engineering parts), and propulsion. US aircraft carriers are notable for having nuclear reactors powering their systems and propulsion. This makes the carrier reasonably tall.

The top of the carrier is the flight deck, where aircraft are launched and recovered. On the starboard side of this is the island, where the funnel, air-traffic control and the bridge are located.

The constraints of constructing a flight deck affect the role of a given carrier strongly, as they influence the weight, type, and configuration of the aircraft that may be launched. For example, assisted launch mechanisms are used primarily for heavy aircraft, especially those loaded with air-to-ground weapons. CATOBAR is most commonly used on US Navy fleet carriers as it allows the deployment of heavy jets with full load-outs, especially on ground-attack missions. STOVL is used by other navies because it is cheaper to operate and still provides good deployment capability for fighter aircraft.

The first carrier landing and take-off of a jet aircraft: Eric "Winkle" Brown landing on HMS Ocean in 1945 DeHavilland Vampire HMS Ocean Dec1945 NAN1 47.jpg
The first carrier landing and take-off of a jet aircraft: Eric "Winkle" Brown landing on HMS Ocean in 1945

Due to the busy nature of the flight deck, only 20 or so aircraft may be on it at any one time. A hangar storage several decks below the flight deck is where most aircraft are kept, and aircraft are taken from the lower storage decks to the flight deck through the use of an elevator. The hangar is usually quite large and can take up several decks of vertical space. [51]

Munitions are commonly stored on the lower decks because they are highly explosive. Usually this is below the waterline so that the area can be flooded in case of emergency.

Flight deck

Catapult launches aboard USS Ronald Reagan US Navy 081124-N-3659B-305 F-A-18C Hornets launch from the Nimitz-class aircraft carrier USS Ronald Reagan (CVN 76).jpg
Catapult launches aboard USS Ronald Reagan

As "runways at sea", aircraft carriers have a flat-top flight deck, which launches and recovers aircraft. Aircraft launch forward, into the wind, and are recovered from astern. The flight deck is where the most notable differences between a carrier and a land runway are found. Creating such a surface at sea poses constraints on the carrier. For example, the fact that it is a ship means that a full-length runway would be costly to construct and maintain. This affects take-off procedure, as a shorter runway length of the deck requires that aircraft accelerate more quickly to gain lift. This either requires a thrust boost, a vertical component to its velocity, or a reduced take-off load (to lower mass). The differing types of deck configuration, as above, influence the structure of the flight deck. The form of launch assistance a carrier provides is strongly related to the types of aircraft embarked and the design of the carrier itself.

There are two main philosophies in order to keep the deck short: add thrust to the aircraft, such as using a Catapult Assisted Take-Off (CATO-); and changing the direction of the airplanes' thrust, as in Vertical and/or Short Take-Off (V/STO-). Each method has advantages and disadvantages of its own:

On the recovery side of the flight deck, the adaptation to the aircraft load-out is mirrored. Non-VTOL or conventional aircraft cannot decelerate on their own, and almost all carriers using them must have arrested-recovery systems (-BAR, e.g. CATOBAR or STOBAR) to recover their aircraft. Aircraft that are landing extend a tailhook that catches on arrestor wires stretched across the deck to bring themselves to a stop in a short distance. Post-WWII Royal Navy research on safer CATOBAR recovery eventually led to universal adoption of a landing area angled off axis to allow aircraft who missed the arresting wires to "bolt" and safely return to flight for another landing attempt rather than crashing into aircraft on the forward deck.

If the aircraft are VTOL-capable or helicopters, they do not need to decelerate and hence there is no such need. The arrested-recovery system has used an angled deck since the 1950s because, in case the aircraft does not catch the arresting wire, the short deck allows easier take off by reducing the number of objects between the aircraft and the end of the runway. It also has the advantage of separating the recovery operation area from the launch area. Helicopters and aircraft capable of vertical or short take-off and landing (V/STOL) usually recover by coming abreast of the carrier on the port side and then using their hover capability to move over the flight deck and land vertically without the need for arresting gear.

Staff and deck operations

F/A-18 Hornet aircraft landing video

Carriers steam at speed, up to 35 knots (65 km/h; 40 mph) into the wind during flight deck operations to increase wind speed over the deck to a safe minimum. This increase in effective wind speed provides a higher launch airspeed for aircraft at the end of the catapult stroke or ski-jump, as well as making recovery safer by reducing the difference between the relative speeds of the aircraft and ship.

Since the early 1950s on conventional carriers it has been the practice to recover aircraft at an angle to port of the axial line of the ship. The primary function of this angled deck is to allow aircraft that miss the arresting wires, referred to as a bolter, to become airborne again without the risk of hitting aircraft parked forward. The angled deck allows the installation of one or two "waist" catapults in addition to the two bow cats. An angled deck also improves launch and recovery cycle flexibility with the option of simultaneous launching and recovery of aircraft.

Conventional ("tailhook") aircraft rely upon a landing signal officer (LSO, radio call sign paddles) to monitor the aircraft's approach, visually gauge glideslope, attitude, and airspeed, and transmit that data to the pilot. Before the angled deck emerged in the 1950s, LSOs used colored paddles to signal corrections to the pilot (hence the nickname). From the late 1950s onward, visual landing aids such as the optical landing system have provided information on proper glide slope, but LSOs still transmit voice calls to approaching pilots by radio.

Key personnel involved in the flight deck include the shooters, the handler, and the air boss. Shooters are naval aviators or naval flight officers and are responsible for launching aircraft. The handler works just inside the island from the flight deck and is responsible for the movement of aircraft before launching and after recovery. The "air boss" (usually a commander) occupies the top bridge (Primary Flight Control, also called primary or the tower) and has the overall responsibility for controlling launch, recovery and "those aircraft in the air near the ship, and the movement of planes on the flight deck, which itself resembles a well-choreographed ballet." [52] The captain of the ship spends most of his time one level below primary on the Navigation Bridge. Below this is the Flag Bridge, designated for the embarked admiral and his staff.

To facilitate working on the flight deck of a US aircraft carrier, the sailors wear colored shirts that designate their responsibilities. There are at least seven different colors worn by flight deck personnel for modern United States Navy carrier air operations. Carrier operations of other nations use similar color schemes.

Deck structures

Island control structure of USS Enterprise US Navy 100512-N-8446A-004 An F-A-18F Super Hornet assigned to the Fighting Checkmates of Strike Fighter Squadron (VFA) 211 lands aboard the aircraft carrier USS Enterprise (CVN 65).jpg
Island control structure of USS Enterprise
The command bridge of the aircraft carrier Charles de Gaulle FS CDG bridge3.jpg
The command bridge of the aircraft carrier Charles de Gaulle

The superstructure of a carrier (such as the bridge, flight control tower) are concentrated in a relatively small area called an island, a feature pioneered on HMS Hermes in 1923. While the island is usually built on the starboard side of the flight deck, the Japanese aircraft carriers Akagi and Hiryū had their islands built on the port side. Very few carriers have been designed or built without an island. The flush deck configuration proved to have significant drawbacks, primary of which was management of the exhaust from the power plant. Fumes coming across the deck were a major issue in USS Langley. In addition, lack of an island meant difficulties managing the flight deck, performing air traffic control, a lack of radar housing placements and problems with navigating and controlling the ship itself. [53]

Another deck structure that can be seen is a ski-jump ramp at the forward end of the flight deck. This was first developed to help launch STOVL aircraft take off at far higher weights than is possible with a vertical or rolling takeoff on flat decks. Originally developed by the Royal Navy, it since has been adopted by many navies for smaller carriers. A ski-jump ramp works by converting some of the forward rolling movement of the aircraft into vertical velocity and is sometimes combined with the aiming of jet thrust partly downwards. This allows heavily loaded and fueled aircraft a few more precious seconds to attain sufficient air velocity and lift to sustain normal flight. Without a ski-jump, launching fully-loaded and fueled aircraft such as the Harrier would not be possible on a smaller flat deck ship before either stalling out or crashing directly into the sea.

Although STOVL aircraft are capable of taking off vertically from a spot on the deck, using the ramp and a running start is far more fuel efficient and permits a heavier launch weight. As catapults are unnecessary, carriers with this arrangement reduce weight, complexity, and space needed for complex steam or electromagnetic launching equipment. Vertical landing aircraft also remove the need for arresting cables and related hardware. Russian, Chinese, and future Indian carriers include a ski-jump ramp for launching lightly loaded conventional fighter aircraft but recover using traditional carrier arresting cables and a tailhook on their aircraft.

The disadvantage of the ski-jump is the penalty it exacts on aircraft size, payload, and fuel load (and thus range); heavily laden aircraft can not launch using a ski-jump because their high loaded weight requires either a longer takeoff roll than is possible on a carrier deck, or assistance from a catapult or JATO rocket. For example, the Russian Su-33 is only able to launch from the carrier Admiral Kuznetsov with a minimal armament and fuel load. Another disadvantage is on mixed flight deck operations where helicopters are also present, such as on a US landing helicopter dock or landing helicopter assault amphibious assault ship. A ski jump is not included as this would eliminate one or more helicopter landing areas; this flat deck limits the loading of Harriers but is somewhat mitigated by the longer rolling start provided by a long flight deck compared to many STOVL carriers.

National fleets

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Countries currently operating fixed-wing aircraft carriers (8)
Countries currently solely operating helicopter carriers (6)
Historical operators of carriers (3) Countries who are currently, or have in the past, operated aircraft carriers.png
  Countries currently operating fixed-wing aircraft carriers (8)
  Countries currently solely operating helicopter carriers (6)
  Historical operators of carriers (3)

The US Navy has the largest fleet of carriers in the world, and currently has eleven supercarriers in service. The UK has two STOVL carriers in service. China has two STOBAR carriers in service. The navies of France, India, and Russia each operate a single medium-size carrier. The US also has nine similarly sized Amphibious Warfare Ships. There are three small light carriers in use capable of operating both fixed-wing aircraft and helicopters, Italy operates two, and Spain one.

Additionally there are fifteen small carriers which only operate helicopters serving the navies of Australia (2), Brazil (1), China(1), Egypt (2), France (3), Japan (4), South Korea (1), and Thailand (1).

Australia

Current
HMAS Canberra, a Canberra-class landing helicopter dock HMAS Canberra (LHD 02) at berth prior to commissioning.jpg
HMAS Canberra, a Canberra-classlanding helicopter dock

The Royal Australian Navy operates two Canberra-classlanding helicopter docks. The two-ship class, based on the Spanish vessel Juan Carlos I and built by Navantia and BAE Systems Australia, represents the largest ships ever built for the Royal Australian Navy. [54]

HMAS Canberra underwent sea trials in late 2013 and was commissioned in 2014. Her sister ship, HMAS Adelaide, was commissioned in December 2015. The Australian ships retain the ski-ramp from the Juan Carlos I design, although the RAN has not acquired carrier-based fixed-wing aircraft.

Brazil

Current

In December 2017, the Brazilian Navy confirmed the purchase of HMS Ocean for (GBP) £84.6 million (equivalent to R$359.5M and US$113.2M) and renamed it Atlântico . The ship was decommissioned from Royal Navy service in March 2018.The Brazilian Navy commissioned the carrier on 29 June 2018 in the United Kingdom. After undertaking a period of maintenance in the UK, was expected to travel to its home port, Arsenal do Rio de Janeiro (AMRJ) and be fully operational by 2020. [55] [56] [57]

The helicopter carrier package for Brazil includes an Artisan 3D search radar, KH1007 surface surveillance radar system, four 30 mm DS30M Mk 2 remote weapon systems and four Mk 5B landing craft. The three original 20 mm Mk 15 Block 1B Phalanx close-in weapon systems, the torpedo defense systems and 7.62 mm M134 machine guns were removed from the ship before its transfer to Brazil. The ship displaces 21,578 tonnes, is 203.43 meters (667.4 ft) long and has a range of 8,000 nautical miles (9,200 mi; 15,000 km).[ citation needed ]

Atlântico will undergo operational sea training under the Royal Navy's Flag Officer Sea Training (FOST) program. [58] [59]

China

Liaoning, a Type 001 aircraft carrier Aircraft Carrier Liaoning CV-16.jpg
Liaoning, a Type 001 aircraft carrier
Current

2 STOBAR carriers:

1 Landing Helicopter Dock

Future

Chinese officials stated that a third carrier, also known as Type 003 carrier is being constructed in the Shanghai Jiangnan Shipyard. She will be the first Chinese aircraft carrier to use catapult take off system (CATOBAR). [70] In May 2019, the Center for Strategic and International Studies released satellite images of what they said was the third carrier under construction at Jiangnan Shipyard near Shanghai. [71] [72] China has had a long-term plan to operate six large aircraft carriers with two carriers per fleet. [73]

China is planning a class of 8 landing helicopter dock vessels, the Type 75 (NATO reporting name Yushen-class landing helicopter assault). This is a class of amphibious assault ship under construction by the Hudong–Zhonghua Shipbuilding company. [74] The first ship was commissioned in April 2021. [69] China is also planning a modified class of the same concept, the Type 076 landing helicopter dock, that will also be equipped with an electromagnetic catapult launch system. [75]

Egypt

Gamal Abdel Nasser LHD docked at Saint-Nazaire, April 2016 ENS Gamal Abdel Nasser LHD.jpg
Gamal Abdel Nasser LHD docked at Saint-Nazaire, April 2016
Current

Egypt signed a contract with French shipbuilder DCNS to buy two Mistral-class helicopter carriers for approximately 950 million euros. The two ships were originally destined for Russia, but the deal was cancelled by France due to Russian involvement in Ukraine. [76]

On 2 June 2016, Egypt received the first of two helicopter carriers acquired in October 2015, the landing helicopter dock Gamal Abdel Nasser. The flag transfer ceremony took place in the presence of Egyptian and French Navies' chiefs of staff, chairman and chief executive officers of both DCNS and STX France, and senior Egyptian and French officials. [77] On 16 September 2016, DCNS delivered the second of two helicopter carriers, the landing helicopter dock Anwar El Sadat which also participated in a joint military exercise with the French Navy before arriving at its home port of Alexandria. [78]

Egypt is so far the only country in Africa or the Middle East to possess a helicopter carrier. [79]

France

The aircraft carrier Charles de Gaulle of the French Navy French aircraft carrier Charles de Gaulle (R91) underway in the Red Sea on 15 April 2019 (190415-N-IL409-0017).JPG
The aircraft carrier Charles de Gaulle of the French Navy
Current

The French Navy operates the Charles de Gaulle, a 42,000-tonne nuclear-powered aircraft carrier, commissioned in 2001 and is the flagship of the French Navy. The ship carries a complement of Dassault Rafale M and E‑2C Hawkeye aircraft, EC725 Caracal and AS532 Cougar helicopters for combat search and rescue, as well as modern electronics and Aster missiles. She is a CATOBAR-type carrier that uses two 75 m C13‑3 steam catapults of a shorter version of the catapult system installed on the US Nimitz-class carriers, one catapult at the bow and one across the front of the landing area. [80] In addition, the French Navy operates three Mistral-classamphibious assault ships. [81]

Future

In October 2018, the French Ministry of Defence began an 18-month study for €40 million for the eventual future replacement of the French aircraft carrier Charles de Gaulle beyond 2030. In December 2020, President Macron announced that construction of the next generation carrier would begin in around 2025 with sea trials to start in about 2036. The carrier is planned to have a displacement of around 75,000 tons and to carry about 32 next-generation fighters, two to three E-2D Advanced Hawkeyes and a yet-to-be-determined number of unmanned carrier air vehicles. [82]

India

Current

1 STOBAR carrier: INS Vikramaditya, 45,400 tonnes, modified Kiev class. The carrier was purchased by India on 20 January 2004 after years of negotiations at a final price of $2.35 billion. The ship successfully completed her sea trials in July 2013 and aviation trials in September 2013. She was formally commissioned on 16 November 2013 at a ceremony held at Severodvinsk, Russia. [83]

Future

India started building INS Vikrant, also known as Indigenous Aircraft Carrier 1 (IAC-1) a 40,000-tonne, 260-metre-long (850 ft) aircraft carrier in 2009. [84] The new carrier will operate MiG-29K and naval HAL Tejas aircraft. [84] The ship will be powered by four gas-turbine engines and will have a range of 8,000 nautical miles (15,000 kilometres), carrying 160 officers, 1,400 sailors, and 40 aircraft. [85] The ship was launched in 2013 and is scheduled to commission in 2022. [86]

A second carrier, INS Vishal, also known as Indigenous Aircraft Carrier 2 (IAC-2) with a displacement of over 65,000 tonnes is planned with a CATOBAR system to launch and recover heavier aircraft. [87]

Italy

Current

2 STOVL carriers:

Future

Italy plans to replace ageing aircraft carrier Garibaldi, as well as one of the San Giorgio-class landing helicopter docks, with a new amphibious assault ship, to be named Trieste. [89] [90] The ship will be significantly larger than her predecessors with a displacement of 33,000 tonnes at full load. Trieste is to carry the F-35B Joint Strike Fighter. [91]

Japan

Helicopter carrier Izumo JMSDF CVH JS Izumo in Ocean.jpg
Helicopter carrier Izumo
Current

4 helicopter carriers:

Future

2 STOVL carriers:

Russia

Russian aircraft carrier Admiral Kuznetsov Russian aircraft carrier Kuznetsov.jpg
Russian aircraft carrier Admiral Kuznetsov
Current

1 STOBAR carrier: Admiral Flota Sovetskogo Soyuza Kuznetsov: 55,000-tonne Admiral Kuznetsov-class STOBAR aircraft carrier. Launched in 1985 as Tbilisi, renamed and operational from 1995. Without catapults she can launch and recover lightly-fueled naval fighters for air defense or anti-ship missions but not heavy conventional bombing strikes.[ citation needed ] Officially designated an aircraft carrying cruiser, she is unique in carrying a heavy cruiser's complement of defensive weapons and large P-700 Granit offensive missiles. The P-700 systems will be removed in the coming refit to enlarge her below decks aviation facilities as well as upgrading her defensive systems. [100] [101]

Future

The Russian Government has been considering the potential replacement of Admiral Kuznetsov for some time and has considered the Shtorm-class aircraft carrier as a possible option. This carrier will be a hybrid of CATOBAR and STOBAR, given the fact that she utilizes both systems of launching aircraft. The carrier is expected to cost between $1.8 billion and $5.63 billion[ clarification needed ]. [102] As of 2020, the project had not yet been approved and, given the financial costs, it was unclear whether it would be made a priority over other elements of Russian naval modernization. [103]

A class of 2 LHD, Project 23900 is planned and an official keel laying ceremony for the project happened on 20 July 2020. [104]

South Korea

Current

2 Dokdo-classamphibious assault ship 18,860-tonne full deck amphibious assault ship with hospital and well deck and facilities to serve as fleet flagship.

Future

South Korea believes it can procure 2 light aircraft carriers by 2036, which will help make the ROKN a blue water navy. [105] In December 2020, details of South Korea's planned carrier program (CVX) were finalized. A vessel of about 40,000-tons is envisaged carrying about 20 F-35B fighters as well as future maritime attack helicopters. Service entry is anticipated in the early 2030s. [106]

Spain

Spanish Juan Carlos I with Harrier II El L-61 virando a babor en su partida de Vigo (34939349652).jpg
Spanish Juan Carlos I with Harrier II
Current

Juan Carlos I: 27,000-tonne, specially designed multipurpose strategic projection ship which can operate as an amphibious assault ship and aircraft carrier. Juan Carlos I has full facilities for both functions including a ski jump for STOVL operations, is equipped with the AV-8B Harrier II attack aircraft. Also, well deck, and vehicle storage area which can be used as additional hangar space, launched in 2008, commissioned 30 September 2010. [107]

Thailand

The aircraft carrier HTMS Chakri Naruebet of the Royal Thai Navy DN-SD-03-08801-1-.JPG
The aircraft carrier HTMS Chakri Naruebet of the Royal Thai Navy
Current

1 offshore helicopter support ship: HTMS Chakri Naruebet helicopter carrier: 11,400-tonne STOVL carrier based on Spanish Príncipe de Asturias design. Commissioned in 1997. The AV-8S Matador/Harrier STOVL fighter wing, mostly inoperable by 1999, [108] was retired from service without replacement in 2006. [109] As of 2010, the ship is used for helicopter operations and for disaster relief. [110]

Turkey

Future
TCG Anadolu at the Sedef Shipyard in Istanbul, 9 January 2020. TCG Anadolu (L-400).jpg
TCG Anadolu at the Sedef Shipyard in Istanbul, 9 January 2020.

TCG Anadolu is a 24,660-tonne planned amphibious assault ship (LHD) of the Turkish Navy that can be configured as a 27,079-tonne light aircraft carrier. [111] Construction began on 30 April 2016 by Sedef Shipbuilding Inc. at their Istanbul shipyard and is expected to be completed by the end of 2020. [112] The construction of a sister ship, to be named TCG Trakya, is currently being planned by the Turkish Navy. [113] [114]

In 2018, İÇDAŞ, a Turkish company, started the construction of the Kızılelma Shipyard in the Biga district of Çanakkale Province specifically for building a new type of large aircraft carrier which is currently being designed by the Turkish Naval Forces. The dry dock of the Kızılelma Shipyard, completed in 2020, is 370 metres (1,210 ft) long and 70 metres (230 ft) wide. [115] [116]

United Kingdom

HMS Queen Elizabeth, a Royal Navy aircraft carrier and lead ship of her class HMS Queen Elizabeth in Gibraltar - 2018 (28386226189).jpg
HMS Queen Elizabeth, a Royal Navy aircraft carrier and lead ship of her class
Current

Two 65,000-tonne [9] Queen Elizabeth-class STOVL carriers which will operate the F-35 Lightning II. HMS Queen Elizabeth was commissioned in December 2017 [117] and HMS Prince of Wales in December 2019.

It is anticipated that Queen Elizabeth will undertake her first operational deployment in 2021. [118] Each Queen Elizabeth-class ship is able to operate around 40 aircraft during peacetime operations and is thought to be able to carry up to 72 at maximum capacity. [119] As of the end of April 2020, 18 F-35B aircraft had been delivered to the Royal Navy and the Royal Air Force. "Full operating capability" for the UK's carrier strike capability is planned for 2023 (2 squadrons or 24 jets operating from one carrier). [120] The longer-term aim is for the ability to conduct a wide range of air operations and support amphibious operations worldwide from both carriers by 2026. [120] They form the central part of the UK Carrier Strike Group.

Future

The Queen Elizabeth-class ships are expected to have service lives of 50 years, [121] therefore there are not imminent studies on their replacement.

United States

Current

11 CATOBAR carriers, all nuclear-powered:

9 amphibious assault ships carrying vehicles, Marine fighters, attack and transport helicopters, and landing craft with STOVL fighters for CAS and CAP:

USS Gerald R. Ford, a Gerald R. Ford-class aircraft carrier USS Gerald R. Ford (CVN-78) underway on 8 April 2017.JPG
USS Gerald R. Ford, a Gerald R. Ford-classaircraft carrier
Future

The current US fleet of Nimitz-class carriers will be followed into service (and in some cases replaced) by the Gerald R. Fordclass. It is expected that the ships will be more automated in an effort to reduce the amount of funding required to maintain and operate the vessels. The main new features are implementation of Electromagnetic Aircraft Launch System (EMALS) (which replace the old steam catapults) and unmanned aerial vehicles. [122]

Following the deactivation of USS Enterprise in December 2012, the US fleet comprised 10 fleet carriers, but that number increased back to 11 with the commissioning of Gerald R. Ford in July 2017. The House Armed Services Seapower subcommittee on 24 July 2007, recommended seven or eight new carriers (one every four years). However, the debate has deepened over budgeting for the $12–14.5 billion (plus $12 billion for development and research) for the 100,000-tonne Gerald R. Ford-class carrier (estimated service 2017) compared to the smaller $2 billion 45,000-tonne America-classamphibious assault ships, which are able to deploy squadrons of F-35Bs. The first of this class, USS America, is now in active service with another, USS Tripoli, and 9 more are planned. [123] [124]

In a report to Congress in February 2018, the Navy stated it intends to maintain a "12 CVN force" as part of its 30-year acquisition plan. [125]

Aircraft carriers in preservation

Current museum carriers

A few aircraft carriers have been preserved as museum ships. They are:

Future museum carriers

See also

Related Research Articles

<i>Queen Elizabeth</i>-class aircraft carrier Royal Navy aircraft carrier class

The Queen Elizabeth class is a class of two aircraft carriers of the United Kingdom's Royal Navy which are the central components of the UK Carrier Strike Group. The lead ship, HMS Queen Elizabeth, was named on 4 July 2014, in honour of Elizabeth I. She was commissioned on 7 December 2017. The second, HMS Prince of Wales, was launched on 21 December 2017, and was commissioned on 10 December 2019. In 2014 the UK Government announced that the second carrier would be brought into service, ending years of uncertainty surrounding its future. This was confirmed by the November 2015 Government Strategic Defence Review, with one carrier being available at any time.

Landing platform helicopter Hull classification used by a number of the worlds navies

Landing platform helicopter (LPH) is a term used by some navies to denote a type of amphibious warfare ship designed primarily to operate as a launch and recovery platform for helicopters and other VTOL aircraft. As such, they are considered a type of helicopter carrier.

STOBAR Aircraft carrier launch and recovery system

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).

Naval aviation Air warfare conducted by forces under naval authority, or in direct support of naval operations

Naval aviation is the application of military air power by navies, whether from warships that embark aircraft, or land bases.

Landing helicopter assault

Landing helicopter assault (LHA) is the United States Navy's hull classification symbol for the general purpose helicopter-carrying amphibious assault ships of the Tarawa and America classes.

Aircraft catapult Device used to launch aircraft from ships

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.

Anti-submarine warfare carrier

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.

Spanish amphibious assault ship <i>Juan Carlos I</i> Amphibious assault ship

Juan Carlos I is a multi-purpose amphibious assault ship-aircraft carrier in the Spanish Navy. Similar in role to many aircraft carriers, the ship has a ski jump for STOVL operations, and is equipped with the AV-8B Harrier II attack aircraft. The vessel is named in honour of Juan Carlos I, the former King of Spain.

<i>Canberra</i>-class landing helicopter dock

The Canberra class is a ship class of two landing helicopter dock (LHD) ships built for the Royal Australian Navy (RAN). Planning to upgrade the navy's amphibious fleet began in 2000, based on Australian experiences leading the International Force for East Timor peacekeeping operation. With a new climate for growing Australian Navy spending, a desire existed for forward defence capability for landing and supporting troops on Asian territory, that had never existed in Australian history, even with the old Majestic-class light fleet carriers, HMAS Melbourne and HMAS Sydney in the 1970s. In 2004, French company Direction des Constructions Navales (DCN) and Spanish company Navantia were invited to tender proposals, with DCN offering the Mistral-class amphibious assault ship and Navantia proposing the "Buque de Proyección Estratégica" design. The Spanish design was selected in 2007, with Navantia responsible for construction of the ships from the keel to the flight deck, and BAE Systems Australia handling the fabrication of the combat and communications systems. Finally, Siemens (Germany) supplied and fitted the azimuth thrusters.

Helicopter carrier Type of aircraft carrier

A helicopter carrier is a type of aircraft carrier whose primary purpose is to operate helicopters. A helicopter carrier has a large flight deck that occupies a large part of the ship, which can extend the full length of the ship like HMS Ocean of the Royal Navy (RN), or only partway, usually aft, as in the Soviet Navy's Moskva class, the Chinese Navy's Type 0891A or the Royal Fleet Auxiliary's (RFA) RFA Argus. It often also has a hangar deck for the storage of aircraft.

CATOBAR

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.

<i>Dokdo</i>-class amphibious assault ship Class of South Korean LPH assault ships

The Dokdo-class amphibious assault ship is a class of landing platform helicopter (LPH) amphibious assault ships operated by the Republic of Korea Navy (ROKN). Designed by Hanjin Heavy Industries (HHIC), the requirements for the amphibious landing ships were to enhance South Korea's current amphibious operation capability, both in terms of assault and military operations other than war (MOOTW) type operations.

<i>Clemenceau</i>-class aircraft carrier Class of French aircraft carriers

The Clemenceau-class aircraft carriers are a pair of aircraft carriers which served in the French Navy from 1961 until 2000. From 2000 until 2017 one served with the Brazilian Navy as São Paulo. The Clemenceau class was France's first successful aircraft carrier design after World War II and was the backbone of the French Fleet for the duration of its forty years of service.

USS <i>America</i> (LHA-6) America-class amphibious assault ship

USS America (LHA-6), is an amphibious assault ship of the United States Navy and the lead ship of her class. The fourth U.S. warship to be named for the United States of America, she was delivered in spring of 2014, replacing Peleliu of the Tarawa class. Her mission is to act as the flagship of an expeditionary strike group or amphibious ready group, carrying part of a Marine expeditionary unit into battle and putting them ashore with helicopters and V-22 Osprey tilt-rotor aircraft, supported by F-35B Lightning II aircraft and helicopter gunships.

Amphibious assault ship Type of warship used in amphibious assaults

An amphibious assault ship is a type of amphibious warfare ship employed to land and support ground forces on enemy territory by an amphibious assault. The design evolved from aircraft carriers converted for use as helicopter carriers. Modern ships support amphibious landing craft, with most designs including a well deck. Coming full circle, some amphibious assault ships also support V/STOL fixed-wing aircraft, now having a secondary role as aircraft carriers.

History of the aircraft carrier

Aircraft carriers are warships that evolved from balloon-carrying wooden vessels into nuclear-powered vessels carrying scores of fixed- and rotary-wing aircraft. Since their introduction they have allowed naval forces to project air power great distances without having to depend on local bases for staging aircraft operations.

Carrier-based aircraft Military aircraft designed specifically for operations from aircraft carriers

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.

<i>Izumo</i>-class multi-purpose destroyer Japanese helicopter carrier class

The Izumo-class multi-purpose destroyers or 22DDH are helicopter carriers in service with the Japan Maritime Self-Defense Force (JMSDF). The class is designated as a multi-purpose operation destroyer by the Japanese government due to limits on the Japanese Constitution prohibiting the acquisition of offensive platforms. The ships of this class are currently the largest surface combatants of the JMSDF, taking over the mantle previously held by the Hyūga-class helicopter destroyers. The lead ship was officially unveiled at Yokohama on 6 August 2013. Both ships of the class could operate STOVL Lockheed Martin F-35B Lightning II aircraft after modifications.

Ski-jump (aviation) Take-off ramp for aircraft

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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Bibliography

Further reading