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Aircraft carrier

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Two aircraft carriers,  (left), and  (right), showing the difference in size between a  and a light  aircraft carrier.
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Two aircraft carriers, USS John C. Stennis (left), and HMS Illustrious (right), showing the difference in size between a supercarrier and a light V/STOL aircraft carrier.
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USS Harry S. Truman anchors outside Portsmouth, England, while her crew enjoy a port visit.
Russian aircraft carrier
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Russian aircraft carrier Kuznetsov
French aircraft carrier
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French aircraft carrier Charles de Gaulle

An aircraft carrier is a warship whose main role is to deploy and recover aircraft. Aircraft carriers thus allow a naval force to project air power great distances without having to depend on local bases for land-based aircraft. Modern navies, who operate such ships, treat aircraft carriers as the centerpiece of the fleet, a role previously played by the battleship. The change, part of the growth of air power as a significant part of warfare, took place during World War II. Unescorted carriers are considered vulnerable to missile attack and therefore travel as part of a carrier battle group.

Aircraft carriers are generally the largest ships operated by navies; a Nimitz-class carrier powered by two nuclear reactors and four steam turbines is 1092 ft (333 m) long and costs about $5 billion. The United States has the majority of aircraft carriers with over a dozen in service, and its aircraft carriers are a cornerstone of American power projection capability.

Nine countries maintain aircraft carriers: United States, United Kingdom, France, India, Russia, Spain, Brazil, Italy and Thailand. In addition the People's Republic of China's People's Liberation Army Navy possesses the former Soviet aircraft carrier Varyag, but most naval analysts believe that they have no intention to operate it, but instead are using Varyag to learn about carrier operations for a future Chinese aircraft carrier. China, alongside Japan and Chile, also operate helicopter-carrying vessels.

Contents

Basic configurations

Aircraft carriers have two basic configurations. The most common has a flat-top deck or flight deck that serves as a take-off and landing area for aircraft. A steam-powered catapult, accelerates an aircraft under full throttle, from 0 to 165 mph (265 km/h) in 2 seconds during take-off to help it reach take-off speed. To land on the carrier, incoming aircraft moving at 150 mph (240 km/h) are equipped with tailhooks to engage one of up to four arrestor cables stretched across the deck, stopping the aircraft within 320 feet (100 m) after engaging a cable. This landing area on U.S. Navy ships is normally at an angle to the aircraft launching area, to allow simultaneous recovery and launching of aircraft, and will typically include additional catapults. When so configured, it is possible to launch individual aircraft as often as every fifteen seconds by alternating between catapults and sets of catapults (i.e. bow-1, angle-1, bow-2, angle-2). The command and control superstructure of an aircraft carrier, comprising the bridge, CIC and control tower, among other systems, is concentrated in a single, relatively small structure on the starboard side of the deck called an "island". Only a very few carriers have ever been designed without an island and most of those were experimental and developmental ships, not full fleet carriers.

The second and more recent configuration, developed for the Royal Navy, has a 'ski-jump' at one end of the flat deck that helps launch the aircraft. This arrangement is designed for use with VTOL or STOVL aircraft that are able to take off and land with little or no forward movement. These aircraft do not require catapult facilities or arrestor cables on the flight deck.

In either case the ship steams at up to 35 knots (65 km/h) straight into the wind during take-off and landing operations in order to increase the apparent wind speed, thereby reducing the required speed of the aircraft relative to the ship.

Basic types

There are several basic types of aircraft carriers, some of which are obsolete:

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INS Viraat is one of only 2 Asian aircraft carriers. Template:Unverifiedimage

Aircraft carriers are generally accompanied by a number of other ships, to provide protection for the relatively unwieldy carrier, to carry supplies, and to provide additional offensive capabilities. This is often termed a battle group or carrier group, sometimes a carrier battle group.

Cruisers and capital ships of the inter-war years often carried a catapult launched seaplane for reconnaissance. It was launched by a catapult and recovered by crane from the water after landing. These were mostly removed during World War II.

Many modern warships have helicopter landing capability and helicopter assault ships represent a new form of aircraft carriers.

History and Milestones

Genesis

Ely takes off fromUSS Birmingham,
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Ely takes off from
USS Birmingham, 14 November 1910
Ely lands on USS Pennsylvania,  .
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Ely lands on USS Pennsylvania,
18 January 1911.

Eugene Ely was the first pilot launch from a stationary ship in November 1910. He took off from the US armored cruiser USS Birmingham at Hampton Roads, Virginia and landed nearby on Willoughby Spit after some five minutes in the air. On January 18 1911 he became the first pilot to land on a stationary ship. He took off from the Tanforan racetrack and landed on the USS Pennsylvania anchored at the San Francisco waterfront.

Commander Charles Samson, RN, became the first airman to take off from a moving warship on May 2 1912. He took off in a Shorts S27 from the battleship HMS Hibernia while she steamed at 10.5 knots (19 km/h) in during the Royal Fleet Review at Weymouth.

The HMS Ark Royal was the first aircraft carrier. It was originally laid down as a merchant ship, but was converted on the building stocks to be an aircraft carrier. Launched in 1914, she served in the Dardanelles Campaign and throughout World War I.

The first strike from a carrier against a land target took place on July 19 1918. Seven Sopwith Camels launched from HMS Furious attacked the German Zeppelin base at Tondern. Several airships and balloons were destroyed.

The first flat deck carriers

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The first flat deck, HMS Argus in 1918
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The first purpose-built aircraft carrier, the Imperial Japanese Navy's Hosho, in 1922.

The Washington Naval Treaty of 1922 placed strict limits on the tonnages of battleships and battlecruisers for the major naval powers after World War I. Consequently, many battleships under construction (or in service) were converted into aircraft carriers. The first ship to have a full length flat deck was HMS Argus the conversion of which was completed in September 1918.

The first ship to be designed specifically as an aircraft carrier was the Japanese Hosho, commissioned in December 1922, followed by HMS Hermes which was commissioned in July 1923. Hermes' construction actually began earlier but numerous tests and experiments delayed its commission.

By the late 1930s, aircraft carriers around the world typically carried three types of aircraft: torpedo bombers, also used for conventional bombings and reconnaissance; dive bombers, also used for reconnaissance (in the US Navy this type of aircraft were known as "scout bombers"); and fighters for fleet defence and bomber escort duties. Because of the restricted spaces on aircraft carriers, all these aircraft were of small, single-engined types, usually with folding wings to facilitate storage.

The Second World War

Planes from the Japanese aircraft carrier  preparing the attack on .
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Planes from the Japanese aircraft carrier Shokaku preparing the attack on Pearl Harbor.

Aircraft carriers played a significant role in World War II. Japan started the war with 10 aircraft carriers, the largest and most modern carrier fleet in the world at that time. There were 6 American aircraft carriers at the beginning of the hostilities, only 3 of them operating in the Pacific, and 3 British aircraft carriers, of which a single one operated in the Indian ocean.

Many of the major battles in the Pacific involved aircraft carriers. The most notable of them is considered to be the Japanese Attack on Pearl Harbor. In addition, the December 1941 Sinking of Prince of Wales and Repulse, who were unescorted by a carrier, drove home the need for the ship class for fleet defense from aerial attack. In the Coral Sea, US and Japanese fleets traded aircraft strikes in the first battle where neither side's ships sighted the other. The Battle of Midway, where four Japanese carriers were sunk in a surprise attack by planes from three American carriers, is often considered the turning point of the war in the Pacific. As a result of these battles, the aircraft carrier replaced the battleship as the dominant naval vessel in the Pacific Theater.

The loss of three major carriers in quick succession in the Pacific led the US Navy to develop the light carrier (CVL) from light cruiser hulls that had already been laid down. These were intended to add fighter squadrons to a task force, and were used in the US Navy only during World War II. The Royal Navy made a similar design which served both them and Commonwealth countries after World War II. One of these carriers, India's INS Viraat, formerly HMS Hermes, is still being used.

Combat experience proved that the British invention of the sealed "hurricane bow" which protected against storms was superior to any other use for very front of the ship, be it machine-guns or a second flight deck. This became standard for British and American carriers. The Japanese carrier Taiho was the first of their ships to incorporate it.

As an emergency stop-gap to protect Atlantic convoys before sufficient escort carriers became available, the British provided air cover using CAM ships and merchant aircraft carriers. CAM ships were merchant vessels equipped with an aircraft, usually a battle-weary Hawker Hurricane, launched by a catapult. Once launched, the aircraft could not land back on the deck and had to ditch in the sea if it was not within range of land.

Merchant aircraft carriers were merchant ships equipped with a flat deck for half a dozen aircraft. They operated with civilian crews, under merchant colors, and carried their normal cargo whilst providing air support for the convoy. As there was no lift or hangar, aircraft maintenance was limited and the aircraft spent the entire trip sitting on the deck.

Escort carriers were built in the US from two basic hull designs: one from a merchant ship, and the other from a slightly larger, slightly faster tanker. Besides defending convoys, these were used to transport aircraft across the ocean. Nevertheless, some participated in the battles to liberate the Philippines, notably the battle off Samar in which six escort carriers and their escorting destroyers briefly took on five Japanese battleships and bluffed them into retreating.

Starting with the Midway class, American carriers had grown so large that it was no longer practical to continue the hangar deck as strength deck concept, and all subsequent American carriers have the flight deck as the strength deck, leaving only the island as superstructure.

Post-War Developments

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HMS Hermes

During the Second World War, aircraft would land on the flight deck parallel to the long axis of the ship's hull. Aircraft which had already landed would be parked on the deck at the bow end of the flight deck. A crash barrier was raised behind them to stop any landing aircraft which overshot the landing area because its landing hook missed the arrestor cables. If this happened, this would often cause serious damage or injury and even, if the crash barrier was not strong enough, to destruction of the parked aircraft too. An important development of the late 1940s was the British invention of the angled deck, where the runway was canted at an angle of a few degrees across the ship.

If an aircraft misses the arrestor cables, the pilot only needs to increase engine power to maximum to get airborne again and will not hit the parked aircraft because the angled deck points out over the sea. The picture of USS John C. Stennis at the top shows an angled landing deck.

The modern steam-powered catapult, powered by steam from the ship's boilers, was invented by Commander C. C. Mitchell RNVR. It was widely adopted following trials on HMS Perseus between 1950 and 1952 which showed it to be more powerful and reliable than the compressed air catapults which had been introduced in the 1930s. As now only nuclear powered carriers have boilers as part of their motive power system, the majority of aircraft carriers are now equipped with steam generating plant solely to power the catapults.

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Landing optics of the Charles de Gaulle

A third British invention was the glide-slope indicator. This was a gyroscopically-controlled lamp on the port side of the deck which would send a beam to the aviator who was about to land, indicating to him whether he was too high or too low or at the wrong angle of attack. It also took into account the effect of the waves on the flight deck. This also helped at night. The device became necessary as the landing speed of aircraft increased.

The US Navy prematurely attempted to become a strategic nuclear force with the project to build the United States, termed CVA, with the "A" signifying "atomic". This ship would have carried twin-propeller bombers, each of which could carry an atomic bomb. The project was cancelled under pressure from the newly-created United States Air Force, and the letter "A" was re-cycled to mean "attack." But this only delayed the growth of carriers. Nuclear weapons would put to sea despite Air Force objections in 1955 aboard USS Forrestal (CVA-59), and by the end of the fifties the Navy had a series of nuclear-armed attack aircraft.

The post-war years also saw the development of the helicopter with different capabilities to a fighter aircraft. Whereas fixed-wing aircraft are suited to air-to-air combat and air-to-surface attack, helicopters are used to transport equipment and personnel and can be used in an anti-submarine warfare role with dipped sonar and missiles.

Modern carriers

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Flight operations on the deck of the USS Abraham Lincoln. An EA-6B Prowler (foreground) moves from deck parking to a catapult station. At the same time, an F/A-18C Hornet (middle) moves to catapult attachment (note jet blast deflector down). F/A-18 (background) has just been launched, while another waits behind the blast deflector.

More modern uses of aircraft carriers include the Falklands War, where the United Kingdom was able to win a conflict 8,000 miles (13,000 km) from home in large part due to the use of the carriers HMS Hermes and HMS Invincible. The Falklands showed the worthiness of a VSTOL aircraft—the Hawker Harrier.

The US has also made use of carriers in the Persian Gulf, Afghanistan and to protect its interests in the Pacific. Most recently, the 2003 invasion of Iraq featured US aircraft carriers as the primary base of US air power. Even without the ability to place significant numbers of aircraft in Middle Eastern airbases, the United States was capable of carrying out significant air attacks from carrier-based squadrons.

In the early 21st century, worldwide aircraft carriers were capable of carrying about 1250 aircraft. US carriers accounted for over 1000 of these; the second leading country, the United Kingdom fielded over 50 aircraft. The United Kingdom and France are both undergoing a drastic expansion in carrier capability (with a common ship class), but the United States will still maintain a very large lead.

The People's Republic of China's People's Liberation Army Navy possesses the former Soviet aircraft carrier Varyag, but most naval analysts believe that they have no intention to operate it, but instead are using Varyag to learn about carrier operations for a future Chinese aircraft carrier.

Future Aircraft carriers

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Future Royal navy Aircraft carrier

Several nations which currently possess Aircraft carriers are in the process of planning new classes, to replace current ones.

Royal Navy

The Royal Navy is currently planning two new Larger Aircraft carriers to replace the three units of the Invincible class currently in service with the Royal Navy. These two ships are expected to be named HMS Queen Elizabeth and HMS Prince of Wales. They will be able to operate about 50 aircraft and will have a displacement of around 60,000 tonnes. The two ships will enter service in 2012 and 2015 respectively. Their primary aircraft complement will be made up of F-35 Joint Strike Fighter, and their ship's company will number around a 1000. The two ships will form the centrepiece of the Royal Navy, and will be the largest warships ever built by the Royal Navy. They have been given adaptable designs to allow maximum flexibility in operations, and are to be designed with a ski jump for STOVL aircraft.

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CVNX/CVN-21

US Navy

The current US Fleet of Nimitz-class carriers are to be followed (and in some cases replaced) into service by the CVN-21/CVNX Carrier. It is expected that the ships/s will be larger and will operate more aircraft (currently limited to 80+) than the Nimitz, and they will also have a much stealthier and advanced design. Recently produced versions of the Nimitz-class carriers, such as the USS Ronald Reagan, have modular, more-easily upgradable weapons systems and electronics.

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Design option for the new French carrier

French Marine Nationale

The French Navy has set in motion plans for a second Aircraft carrier, to supplement the Charles De Gaulle. The design is to be much larger, in the range of 50–60,000 tonnes, and will not be nuclear-powered like the Charles De Gaulle. There are plans to work with the Royal Navy to develop a joint design, by BAE Systems, and Thales, around the Royal Navy CVF programme.

Badges of Naval Aviation

To recognize the qualification and training required for service onboard an aircraft carrier, most of the world's navies issue special badges and patches to denote those who are naval pilots or naval aviation support personnel.

United States

Aircraft carriers in fiction

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An Aircraft Carrier in the game Command and Conquer Generals: Zero Hour

See also

External link

de:Flugzeugtrger es:Portaaviones fr:Porte-avions id:Kapal induk it:Portaerei he:נושאת מטוסים ms:Kapal induk nl:Vliegdekschip ja:航空母艦 pl:Lotniskowiec pt:Porta-avies fi:Lentotukialus sv:Hangarfartyg

zh:航空母舰

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