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An aircraft carrier is a Warship designed to deploy and in most cases recover Aircraft , acting as a sea-going Airbase . Aircraft carriers thus allow a Naval force to project Air Power great distances without having to depend on local bases for staging aircraft operations. They have evolved from wooden vessels used to deploy a Balloon into Nuclear Powered warships that carry dozens of fixed and rotary wing aircraft. Balloon Carrier s were the first ships to deploy manned aircraft, used during the 19th and early 20th century, mainly for observation purposes. The 1903 advent of fixed wing airplanes was followed in 1910 by the first flight of such an aircraft from the deck of a US Navy cruiser. Seaplane s and Seaplane Tender support ships, such as HMS ''Engadine'' , followed. The development of flat top vessels produced the first large fleet ships. This evolution was well underway by the mid 1920s, resulting in ships such as the '' HMS Hermes '', '' Hōshō '', and the Lexington Class Aircraft Carrier s. World War II saw the first large scale use and further refinement of the aircraft carrier, spawning several types. Escort Aircraft Carrier s, such as USS ''Barnes'' , were built only during World War II. Although some were purpose built, most were converted from merchant ships, and were a stop-gap measure in order to provide air support for convoys and amphibious invasions. Light Aircraft Carrier s, such as USS ''Independence'' represented a larger, more "militarized" version of the escort carrier concept. Although the light carriers usually carried the same size air groups as escort carriers, they had the advantage of higher speed as they had been converted from cruisers under construction rather than civilian merchant ships. Wartime emergencies also saw the creation or conversion of other, unconventional aircraft carriers. CAM Ship s, like the SS ''Michael E'' , were cargo carrying merchant ships which could launch but not retrieve fighter aircraft from a catapult. These vessels were an emergency measure during World War II as were Merchant Aircraft Carrier s (MACs), such as MV ''Empire MacAlpine'' , another emergency measure which saw cargo-carrying merchant ships equipped with flight decks. Battlecarrier s were created by the Imperial Japanese Navy to partially compensate for the loss of carrier strength at Midway . Two of them were made from ''Ise'' Class battleships during late 1943. The aft turrets were removed and replaced with a hangar, deck and catapult. The heavy cruiser ''Mogami'' concurrently received a similar conversion. This "half and half" design was an unsuccessful compromise, being neither one thing nor the other. In addition the superstructure and the turbulent airflow it generated made landing even more hazardous than usual. Submarine Aircraft Carrier s, such as the French ''Surcouf'' , or the Japanese I-400 Class Submarine s which were capable of carrying 3 Aichi M6A ''Seiran'' aircraft. The first of these were built in the 1920s, but were generally unsuccessful at war. Modern navies that operate such ships treat aircraft carriers as the Capital Ship 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 . This change was driven by the superior range, flexibility and effectiveness of carrier-launched aircraft. Following the war, the scope of carrier operations continued to increase in size and importance. The Supercarrier , typically displacing 75,000 tonnes or greater has been the pinnacle of carrier development since their introduction. Most are powered by nuclear reactors and form the core of a fleet designed to operate far from home. Amphibious Assault Carriers , such as USS ''Tarawa'' or HMS ''Ocean'' , which serve the purpose of carrying and landing Marines and operate a large contingent of helicopters for that purpose. They have a secondary capability to operate VSTOL aircraft. Also known as "commando carriers" or "helicopter carriers". Lacking the firepower of other warships, carriers by themselves are considered vulnerable to attack by other ships, aircraft, submarines or missiles and therefore travel as part of a of United States 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 of military aircraft over the years. FLIGHT DECK See Also: Flight deck As "runways at sea," modern aircraft carriers have a flat-top deck design that serves as a Flight Deck for Take-off and Landing of aircraft. Aircraft take off to the front, into the wind, and land from the rear. Carriers steam at speed, for example up to 35 Knots (65 km/h), into the wind during take-off in order to increase the Apparent Wind speed, thereby reducing the speed of the aircraft relative to the ship. On some ships, a steam-powered Catapult is used to propel the aircraft forward assisting the power of its engines and allowing it to take off in a shorter distance than would otherwise be required, even with the headwind effect of the ship's course. On other carriers, aircraft do not require assistance for take off — the requirement for assistance relates to aircraft design and performance. Conversely, when landing on a carrier, conventional aircraft rely upon a Tailhook that catches on Arrestor Wires stretched across the deck to bring them to a stop in a shorter distance than normal. Other aircraft — Helicopter s and V/STOL (Vertical/Short Take-Off and Landing) designs — utilize their hover capability to land vertically and so require no assistance in speed reduction upon landing. Conventional ("tailhook") aircraft rely upon a Landing Signal Officer (LSO) to control the plane's landing approach, visually gauging altitude, attitude, and speed, and transmitting that data to the pilot. Before the angled deck emerged in the 1950s, LSOs used colored paddles to signal corrections to the pilot. From the late 1950s onward, visual landing aids such as mirrors provided information on proper Glide Slope , but LSOs still transmit voice calls to landing pilots by radio. Since the early 1950s it has been common to direct the landing recovery area off to port at an angle to the line of the ship. The primary function of the angled deck landing area is to allow aircraft who miss the arresting wires, referred to as a "bolter", to become airborne again without the risk of hitting aircraft parked on the forward parts of the deck. The angled deck also allows launching of aircraft at the same time as others land. s on the Flight Deck of the ''Nimitz''-class Supercarrier ''Harry S. Truman'' ]] The above deck areas of the warship (the Bridge , flight Control Tower , and so on) are concentrated to the Starboard side of the deck in a relatively small area called an "island". Very few carriers have been designed or built without an island and such a configuration has not been seen in a fleet sized carrier. The "flush deck" configuration proved to have very significant drawbacks, complicating navigation, air traffic control and numerous other factors. A more recent configuration, used by the British and heavily-laden strike fighters like the F/A-18E/F Super Hornet cannot use a ski jump because their high weight requires either a longer takeoff roll than is possible on a carrier deck, or catapult assistance. HISTORY AND MILESTONES Though aircraft carriers are given their definition with respect to fixed-wing aircraft, the first known instance of using a ship for airborne operations occurred in 1806, when the British Royal Navy's Lord Thomas Cochrane launched kites from the 32-gun frigate '' HMS Pallas '' in order to drop propaganda leaflets on the French territory. Balloon carriers See Also: Balloon carrier On July 12 , 1849 , the Austrian Navy ship ''Vulcano'' launched a manned hot air balloon in order to drop bombs on Venice , although the attempt failed due to contrary winds. 1 Later, during the American Civil War , about the time of the Peninsula Campaign , gas-filled Balloon s were being used to perform reconnaissance on Confederate positions. The battles soon turned inland into the heavily forested areas of the Peninsula, however, where balloons could not travel. A coal barge, the George Washington Parke Custis, was cleared of all deck rigging to accommodate the gas generators and apparatus of balloons. From the GWP Prof. Thaddeus S. C. Lowe , Chief Aeronaut of the Union Army Balloon Corps , made his first ascents over the Potomac River and telegraphed claims of the success of the first aerial venture ever made from a water-borne vessel. Other barges were converted to assist with the other military balloons transported about the eastern waterways. It is only fair to point out in deference to modern aircraft carriers that none of these Civil War crafts had ever taken to the high seas. Balloons launched from ships led to the development of Balloon Carrier s, or balloon tenders, during World War I , by the navies of Great Britain, France, Germany, Italy, Russia, and Sweden. About ten such "balloon tenders" were built, their main objective being aerial observation posts. These ships were either decommissioned or converted to Seaplane Tender s after the war. Seaplane carriers See Also: Seaplane carrier '' (right, with hangar and crane), with one of her '' Canard Voisin '' seaplanes taking off, during tactical exercises in June 1912.]] The invention of the '', the first Seaplane Carrier , and the first known carrier of Airplanes . Commissioned as a seaplane tender, and carrying float-equipped planes under hangars on the main deck, from where they were lowered on the sea with a crane, she participated in tactical exercises in the Mediterranean in 1912. ''La Foudre'' was further modified in November 1913 with a 10 meter long flat deck to launch her seaplanes. Description and photograph of ''Foudre'' HMS ''Hermes'' , temporarily converted as an experimental seaplane carrier in April-May 1913, is also one of the first seaplane carriers, and the first experimental seaplane carrier of the British Navy. She was originally laid down as a merchant ship, but was converted on the building stocks to be a seaplane carrier for a few trials in 1913, before being converted again to a cruiser, and back again to a seaplane carrier in 1914. She was sunk by a German submarine in October 1914. The first seaplane tender of the US Navy was the USS ''Mississippi'' , converted to that role in December 1913. First US seaplane carrier, the USS ''Mississippi'' Many Cruisers and Capital Ship s of the inter-war years often carried a catapult launched seaplane for reconnaissance and spotting the fall of the guns. It was launched by a catapult and recovered by crane from the water after landing. These were highly successful during World War II; there were many notable successes early in the war as shown by HMS ''Warspite'' ’s float equipped Swordfish during operations in the Norwegian fjords in 1940. The Japanese Rufe floatplane derived from the Zero was a formidable fighter with only a slight loss in flight performance, one of their pilots scored 26 kills in the A6M2-N Rufe ; a score only bettered by a handful of American pilots throughout WW2. Other Japanese seaplanes launched from tenders and warships sank merchant ships and small-scale ground attacks. The culmination of the type was the American 300+ mph (480 km/h) Curtiss SC Seahawk which was actually a fighter aircraft like the Rufe in addition to a two-seat gunnery spotter and transport for an injured man in a litter. Spotter seaplane aircraft on U.S. Navy cruisers and battleships were in service until 1949. Seaplane fighters were considered poor combat aircraft compared to their carrier-launched brethren; they were slower due to the drag of their pontoons or boat hulls. Contemporary propeller-driven, land-based fighter aircraft were much faster (450-480 mph / 720–770 km/h as opposed to 300-350 mph / 480–560 km/h) and more heavily armed. The Curtiss Seahawk only had two 0.50 inch (12.7 mm) calibre machine guns compared to four 20 mm cannon in the Grumman F8F Bearcat or four 0.50 (12.7 mm) cal machine guns plus two 20 mm cannon in the Vought F4U Corsair . Jet aircraft of just a few years later were faster still (500+ mph) and still better armed, especially with the development of Air To Air Missile s in the early to mid 1950s. Genesis of the flat-deck carrier As heavier-than-air aircraft developed in the early 20th century various navies began to take an interest in their potential use as scouts for their big gun warships. In 1909 the French inventor Clément Ader published in his book " L'Aviation Militaire " the description of a ship to operate airplanes at sea, with a flat flight deck, an island Superstructure , deck elevators and a hangar bay.Clement Ader on the structure of the aircraft carrier: "An airplane-carrying vessel is indispensable. These vessels will be constructed on a plan very different from what is currently used. First of all the deck will be cleared of all obstacles. It will be flat, as wide as possible without jeopardizing the nautical lines of the hull, and it will look like a landing field." Military Aviation, p35 On stowage: "Of necessity, the airplanes will be stowed below decks; they would be solidly fixed anchored to their bases, each in its place, so they would not be affected with the pitching and rolling. Access to this lower decks would be by an elevator sufficiently long and wide to hold an airplane with its wings folded. A large, sliding trap would cover the hole in the deck, and it would have waterproof joints, so that neither rain nor seawater, from heavy seas could penetrate below." Military Aviation, p36 On the technique of landing: "The ship will be headed straight into the wind, the stern clear, but a padded bulwark set up forward in case the airplane should run past the stop line" Military Aviation, p37 That year the US Naval Attaché in Paris sent a report on his observations. 2 1910 .]] A number of experimental flights were made to test the concept. Eugene Ely was the first Pilot to launch from a stationary ship in November 1910. He took off from a structure fixed over the forecastle of the US Armored Cruiser USS ''Birmingham'' at Hampton Roads , Virginia and landed nearby on Willoughby Spit after some five minutes in the air. 1911 .]] 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 a similar temporary structure on the aft of USS ''Pennsylvania'' anchored at the San Francisco waterfront — the improvised braking system of sandbags and ropes led directly to the arrestor hook and wires described above. His aircraft was then turned around and he was able to take off again. Commander Charles Samson, RN , became the first airman to take off from a moving warship on May 2 1912 . He took off in a Short S27 from the battleship HMS ''Hibernia'' while she steamed at 10.5 knots (19 km/h) during the Royal Fleet Review at Weymouth . World War I conducted the world's first naval-launched air raids in September 1914.]] The first strike from a carrier against a land target as well as a sea target took place in September 1914 when the 1914 when twelve seaplanes from HMS' ''Engadine'', ''Riviera'' and ''Empress'' (cross-channel steamers converted into seaplane carriers ) Attacked The Zeppelin Base At Cuxhaven . The attack was not a complete success, although a German warship was damaged; nevertheless the raid demonstrated in the European theatre the feasibility of attack by ship-borne aircraft and showed the strategic importance of this new weapon. , a seaplane carrier also equipped with two regular aeroplanes, was arguably the first modern aircraft carrier.]] HMS ''Ark Royal'' was arguably the first modern aircraft carrier. She was originally laid down as a merchant ship, but was converted on the building stocks to be a hybrid airplane/ seaplane carrier with a launch platform. Launched September 5 1914 , she served in the Dardanelles campaign and throughout World War I. Other carrier operations were mounted during the war the most successful taking place on 19 July 1918 when seven Sopwith Camel s launched from HMS ''Furious'' attacked the German Zeppelin base at Tondern , with two 50 lb bombs each. Several Airship s and Balloon s were destroyed, but as the carrier had no method of recovering the aircraft safely, two of the pilots ditched their aircraft in the sea alongside the carrier while the others headed for neutral Denmark . Inter-war years in 1918]] The Washington Naval Treaty of 1922 placed strict limits on the tonnages of battleships and Battlecruiser s for the major naval powers after World War I , as well as limits not only on the total tonnage for carriers, but also an upper limit on 27,000 tonnes for each ship. Although exceptions were made regarding the max ship tonnage (fleet units counted, experimental units did not), the total tonnage could not be exceeded. However, while all of the major navies were over-tonnage on battleships, they were all considerably under-tonnage on aircraft carriers. Consequently, many battleships and battlecruisers 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, with the U.S. Navy not following suit until 1920, when the conversion of USS ''Langley'' (an experimental ship which did not count against America's carrier tonnage) had completed. The first American fleet carriers would not join the service until 1928 ( USS ''Lexington'' and ''Saratoga'' ). 's 1922 was), her construction finished sooner. Her hull was still based on a cruiser design, whereas the ''Hermes'' had a purpose-designed hull.]] The first purpose-designed aircraft carrier to be developed was the HMS ''Hermes'' , although the first one to be commissioned was the Japanese ''Hōshō'' (commissioned in December 1922, followed by HMS ''Hermes'' in July 1923)."Hōshō was a carrier from the keel, the first of its kind completed in any navy of the world" Scot MacDonald Imperial Japanese Navy was a pioneer in naval aviation, having commissioned the world's first built-from-the-keel-up carrier, the ''Hosho''." [http://www.globalsecurity.org/military/world/japan/ijn.htm Source . ''Hermes'' By the late 1930s, aircraft carriers around the world typically carried three types of aircraft: Torpedo Bomber s, also used for conventional bombings and Reconnaissance ; Dive Bomber s, also used for reconnaissance (in the U.S. Navy, this type of aircraft were known as "scout bombers"); and Fighters for fleet defence and bomber escort duties. Because of the restricted space on aircraft carriers, all these aircraft were of small, single-engined types, usually with Folding Wing s to facilitate storage. World War II Aircraft carriers played a significant role in World War II. With seven aircraft carriers afloat, the British Royal Navy had a considerable numerical advantage at the start of the war as neither the Germans nor the Italians had carriers of their own. 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 battlecruisers during the Norwegian campaign in 1940. This apparent weakness to battleships was turned on its head in November 1940 when HMS ''Illustrious'' launched a long-range strike on the Italian fleet at Taranto . This operation incapacitated three of the six battleships in the harbour at a cost of two of the 21 attacking Fairey Swordfish Torpedo Bombers . Carriers also played a major part in reinforcing Malta , both by transporting planes and by defending convoys sent to supply the besieged island. The use of carriers prevented the Italian Navy and land-based German aircraft from dominating the Mediterranean theatre. In the Atlantic, aircraft from HMS ''Ark Royal'' and HMS ''Victorious'' were responsible for slowing ''Bismarck'' during May 1941. Later in the war, escort carriers proved their worth guarding convoys crossing the Atlantic and Arctic oceans. 's ''Shinano'' , was the largest aircraft carrier of World War II to be commissioned, but was sunk before actually entering service. The ship also illustrated the traditional aircraft carrier open bow.]] Many of the major battles in the Pacific involved aircraft carriers. Japan started the war with ten aircraft carriers, the largest and most modern carrier fleet in the world at that time. There were six American aircraft carriers at the beginning of the hostilities, although only three of them were operating in the Pacific. Drawing on the 1939 Japanese development of shallow water modifications for aerial torpedoes and the 1940 British aerial attack on the Italian fleet at Taranto , the 1941 Japanese surprise Attack On Pearl Harbor was a clear illustration of the Power Projection capability afforded by a large force of modern carriers. Concentrating six flattops in a single striking unit marked a turning point in naval history, as no other nation had fielded anything comparable. (Though Germany and Italy began construction of carriers, neither were completed. Of the two, Germany's '' Graf Zeppelin '' had the greater potential.) Meanwhile, the Japanese began their advance through Southeast Asia and the Sinking Of ''Prince Of Wales'' And ''Repulse'' by Japanese land-based aircraft drove home the need for this ship class for fleet defence from aerial attack. In April 1942, the Japanese fast carrier strike force ranged into the Indian Ocean and sank shipping, including the damaged and undefended carrier HMS ''Hermes'' . Smaller Allied fleets with inadequate aerial protection were forced to retreat or be destroyed. In the Coral Sea , US and Japanese fleets traded aircraft strikes in the first battle where neither side's ships sighted the other. At the Battle Of Midway all four Japanese carriers engaged were sunk by planes from three American carriers (one of which was lost) and the battle is considered the turning point of the war in the Pacific. Notably, the battle was orchestrated by the Japanese to draw out American carriers that had proven very elusive and troublesome to the Japanese. '' (bottom), an early fleet carrier Enterprise (2nd from bottom), a war time built '' Essex ''-class carrier (2nd from top, the '' Hornet '') and a light carrier based on a cruiser hull, the '' San Jacinto '' (top).]] Subsequently the US was able to build up large numbers of aircraft aboard a mixture of fleet, light and (newly commissioned) escort carriers, primarily with the introduction of the Essex Class in 1943. These ships, around which were built the fast carrier task forces of the Third and Fifth Fleets , played a major part in winning the Pacific War . The eclipse of the battleship as the primary component of a fleet was clearly illustrated by the sinking of the largest battleship ever built, ''Yamato'' , by carrier-borne aircraft in 1945. Japan also built the largest aircraft carrier of the war, ''Shinano'' , which was a ''Yamato'' class ship converted mid-way through construction after the disastrous loss of four fleet carriers at Midway. She was sunk by a patrolling US submarine while in transit shortly after commissioning, but before being fully outfitted or operational in November 1944. IMPORTANT INNOVATIONS JUST BEFORE AND DURING WORLD WAR II had a hurricane bow.]] Hurricane bow circa 1935.]] A hurricane bow is a completely enclosed hangar deck, first seen on the American Lexington Class aircraft carriers which entered service in 1927. Combat experience proved it to be by far the most useful configuration for the bow of the ship among others that were tried; including second flying-off decks and an anti-aircraft battery (the latter was the most common American configuration during World War II). This feature would be re-incorporated into American carriers post-war. The Japanese carrier ''Taihō'' was the first of their ships to incorporate it. Light Aircraft Carriers 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. They were intended to provide additional fast carriers, as escort carriers did not have the requisite speed to keep up with the fleet carriers and their escorts. The actual U.S. Navy classification was small aircraft carrier (CVL), not light. Prior to July 1943, they were just classified as aircraft carriers (CV).CVL--Small Aircraft Carriers, Naval Historical Center , http://www.history.navy.mil/photos/shusn-no/cvl-no.htm, accessed 22 September 2006. The British 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. Escort Carriers and Merchant Aircraft Carriers To protect Atlantic Convoy s, the British developed what they called Merchant Aircraft Carrier s, which were merchant ships equipped with a flat deck for half a dozen aircraft. These operated with civilian crews, under merchant colors, and carried their normal cargo besides 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. These served as stop-gap until dedicated Escort Carriers could be built in the US (US classification ''CVE''). About a third of the size of a fleet carrier, it carried about two dozen aircraft for anti-submarine duties. Over one hundred were built or converted from merchantmen. 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. Catapult Aircraft Merchantmen As an emergency stop-gap before sufficient merchant aircraft carriers became available, the British provided air cover for convoys using ''Catapult aircraft merchantman'' (CAM ships) and Merchant Aircraft Carrier s. 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. Over two years, fewer than 10 launches were ever made, yet these flights did have some success: 6 bombers for the loss of a single pilot. POST-WAR DEVELOPMENTS Three major post-war developments came from the need to improve operations of jet-powered aircraft, which had higher weights and landing speeds than their propeller-powered forbears. The first jets were tested as early as 3 December 1945 ; a De Havilland Vampire and jets were operating by the early 1950s from carriers. Angled decks 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, it would often cause serious damage or injury and even, if the crash barrier was not strong enough, destruction of parked aircraft. An important development of the early 1950s 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. Steam catapults The modern Steam-powered Catapult , powered by steam from the ship's Boiler s or reactors, 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 1940s. Landing system '']] Another British invention was the glide-slope indicator (also known as a "meatball"). This was a gyroscopically-controlled lamp (which used a Fresnel Lens ) on the port side of the deck which could be seen by the aviator who was about to land, indicating to him whether he was too high or too low in relation to the desired glidepath. It also took into account the effect of the waves on the flight deck. The device allowed the pilot to land without direction from the ship, previously provided by a signalman with flags or lighted wands, or an air controller using a radio. It became a necessity as the landing speed of aircraft increased. Nuclear age The US Navy attempted to become a strategic nuclear force in parallel with the U.S.A.F long range bombers with the project to build ''United States'' , which was termed CVA, with the "A" signifying "atomic". This ship would have carried long range twin-engine bombers, each of which could carry an atomic bomb. The project was canceled 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 Weapon s would be part of the carrier weapons load despite Air Force objections beginning in 1955 aboard USS ''Forrestal'' , and by the end of the fifties the Navy had a series of nuclear-armed attack aircraft.) (see USS Franklin D. Roosevelt (CV-42) ) The US Navy also built the first aircraft carrier to be powered by nuclear reactors. USS ''Enterprise'' is powered by eight nuclear reactors and was the second surface warship (after USS Long Beach ) to be powered in this way. Subsequent supercarriers starting with USS Nimitz took advantage of this technology to increase their endurance utilizing only two reactors. The only other nation to have followed the US lead is France with ''Charles De Gaulle'' although nuclear power is used for submarine propulsion by France, Great Britain and the former Soviet Union. Helicopters The post-war years also saw the development of the Helicopter , with a variety of useful roles and mission capability aboard aircraft carriers. 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 (ASW) role, with dipping sonar and air-launched torpedoes and depth charges; as well as anti-surface vessel warfare, with air-launched anti-ship missiles. In the late 1950s and early 1960s, the UK and the U.S. converted some of their older carriers into Commando Carriers; sea-going helicopter airfields like HMS ''Bulwark'' . To mitigate against the expensive connotations of the term "aircraft carrier", the new ''Invincible'' Class carriers were originally designated as "through deck cruisers" and were initially helicopter-only craft to operate as escort carriers. The arrival of the Sea Harrier VTOL / STOVL fast jet meant they could carry fixed-wing aircraft, despite their short flight deck. The U.S. used conventional carriers initially as pure ASW carriers, embarking helicopters and fixed-wing ASW aircraft like the S-2 Tracker. Later, specialized LPH helicopter carriers for the transport of United States Marine Corps troops and their helicopter transports were developed. These were evolved into the LHA and later into the LHD classes of amphibious assault ships, similar to the UK model even to the point of embarking Harrier aircraft, though much larger. Ski-jump ramp 's light carrier INS ''Viraat'' , formerly HMS ''Hermes'' , purchased from the British, after INS Vikrant shows another example of the ski jump.]] Still another British invention was the ski-jump ramp as an alternative to contemporary catapult systems. As the Royal Navy retired or sold the last of its World War II -era carriers, they were replaced with smaller ships designed to operate helicopters and the VTOL Sea Harrier fast jet; ships such as ''HMS Invincible'' . The ski-jump allowed Harriers to take off with heavier loads, a STOVL option allowing them to take off with a heavier payload despite its usage of space for aircraft parking. It has since been adopted by the navies of several nations. POST-WORLD WAR II CONFLICTS UN carrier operations in the Korean War The United Nations command began carrier operations against the North Korean Army on July 3 , 1950 in response to the invasion of South Korea . Task Force 77 consisted at that time of the carriers USS ''Valley Forge'' and HMS ''Triumph'' . Before the armistice of July 27 , 1953 , 12 U.S. carriers served 27 tours in the Sea Of Japan as part of the Task Force 77. During periods of intensive air operations as many as four carriers were on the line at the same time (see Attack On The Sui-ho Dam ), but the norm was two on the line with a third "ready" carrier at Yokosuka able to respond to the Sea Of Japan at short notice. A second carrier unit, Task Force 95, served as a blockade force in the Yellow Sea off the west coast of North Korea. The task force consisted of a Commonwealth light carrier ( HMS ''Triumph'' , ''Theseus'' , ''Glory'' , ''Ocean'' , and '' HMAS ''Sydney'' )'' and usually a U.S. escort carrier ( USS ''Badoeng Strait'' , ''Bairoko'' , ''Point Cruz'' , ''Rendova'' , and ''Sicily'' ). Over 301,000 carrier strikes were flown during the Korean War: 255,545 by the aircraft of Task Force 77; 25,400 by the Commonwealth aircraft of Task Force 95, and 20,375 by the escort carriers of Task Force 95. United States Navy and Marine Corps carrier-based combat losses were 541 aircraft. The Fleet Air Arm lost 86 aircraft in combat, and the Fleet Air Arm of Australia 15. U.S. carrier operations in Southeast Asia The United States Navy fought "the most protracted, bitter, and costly war" (René Francillon) in the history of naval aviation from August 2 , 1964 to August 15 , 1973 in the waters of the South China Sea . Operating from two deployment points ( Yankee Station and Dixie Station ), carrier aircraft supported combat operations in South Vietnam and conducted bombing operations in conjunction with the U.S. Air Force in North Vietnam under Operations Flaming Dart , Rolling Thunder , and Linebacker . The number of carriers on the line varied during differing points of the conflict, but as many as six operated at one time during Operation Linebacker . Twenty-one aircraft carriers (all operational attack carriers during the era except ''John F. Kennedy'' ) deployed to Task Force 77 of the U.S. Seventh Fleet , conducting 86 war cruises and operating 9,178 total days on the line in the Gulf Of Tonkin . 530 aircraft were lost in combat and 329 more in operational accidents, causing the deaths of 377 naval aviators, with 64 others reported missing and 179 taken Prisoner-of-war . 205 officers and men of the ship's complements of three carriers ( ''Forrestal'' , ''Enterprise'' , and ''Oriskany'' ) were killed in major shipboard fires. Falklands War During the Falklands War 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 light fleet carrier HMS ''Hermes'' and the smaller "through deck cruiser" HMS ''Invincible'' . The Falklands showed the value of a VSTOL aircraft — the Hawker Siddeley Harrier (the RN Sea Harrier and press-ganged RAF Harriers) in defending the fleet and assault force from shore based aircraft and for attacking the enemy. Sea Harriers shot down 21 fast attack jets and suffered no aerial combat losses, although six were lost to accidents and ground fire. Helicopters from the carriers were used to deploy troops, Medevac , SAR and ASW . Operations in the Persian Gulf The US has also made use of carriers in the Persian Gulf , Afghanistan and to protect its interests in the Pacific. During the 2003 Invasion Of Iraq US aircraft carriers served 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. Recently, US aircraft carriers, such as the USS ''Ronald Reagan'' provided air support for counter-insurgency operations in Iraq. AIRCRAFT CARRIERS TODAY , ''Charles De Gaulle'' , HMS ''Ocean'' and USS ''John F. Kennedy'' — and escort vessels on operations in 2002. The ships are sailing much closer together than they would during combat operations.]] Aircraft carriers are generally the largest ships operated by Navies ; a ''Nimitz'' class carrier powered by two Nuclear Reactor s and four Steam Turbine s is 1092 feet (333 m) long and costs about $4.5 billion. The United States has the majority of aircraft carriers with eleven in service, one under construction, and one on order. Its aircraft carriers are a cornerstone of American power projection capability. '' Charles De Gaulle '' (R-91), currently the only nuclear powered aircraft carrier operated by a country other than the United States .]] Nine countries maintain , United Kingdom , France , Russia , Italy , India , Spain , Brazil , 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 future Chinese aircraft carriers. South Korea , United Kingdom , Canada , the People's Republic Of China , India , Japan , Australia , Chile , Singapore and France also operate vessels capable of carrying and operating multiple helicopters. 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 . In the early 21st century, worldwide aircraft carriers are capable of carrying about 1250 aircraft. US carriers account for over 1000 of these. The United Kingdom and France are both undergoing a major expansion in carrier capability (with a Common Ship Class ), but the United States will still maintain a very large lead.
Other aircraft carriers
Related lists
NOTES REFERENCES
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