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Grumman F6F Hellcat

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A carrier-based aircraft (also known as carrier-capable aircraft , carrier-borne aircraft , or carrier aircraft ) is a naval aircraft designed for operations from aircraft carriers . Carrier-based aircraft must be able to launch in a short distance and be sturdy enough to withstand the abrupt forces of launching from and recovering on a pitching deck. In addition, their wings are generally able to fold up, easing operations in tight quarters.

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60-730: The Grumman F6F Hellcat is an American carrier-based fighter aircraft of World War II . Designed to replace the earlier F4F Wildcat and to counter the Japanese Mitsubishi A6M Zero , it was the United States Navy 's dominant fighter in the second half of the Pacific War . In gaining that role, it prevailed over its faster competitor, the Vought F4U Corsair , which initially had problems with visibility and carrier landings. Powered by

120-413: A Kawanishi H8K "Emily" flying boat . Soon after, on 23 and 24 November, Hellcats engaged Japanese aircraft over Tarawa , shooting down a claimed 30 Mitsubishi Zeros for the loss of one F6F. Over Rabaul, New Britain , on 11 November 1943, Hellcats and F4U Corsairs were engaged in day-long fights with many Japanese aircraft, including A6M Zeros, claiming nearly 50 aircraft. When trials were flown against

180-810: A 2,000  hp (1,500 kW) Pratt & Whitney R-2800 Double Wasp , the same powerplant used for both the Corsair and the United States Army Air Forces (USAAF) Republic P-47 Thunderbolt fighters, the F6F was an entirely new design, but it still resembled the Wildcat in many ways. Some military observers tagged the Hellcat as the "Wildcat's big brother". The F6F made its combat debut in September 1943. It subsequently established itself as

240-692: A 2,000 lb (910 kg) bomb, to attack bridges in Korea. Flying from USS  Boxer , the Hellcat drones were radio controlled from an escorting AD Skyraider . The F6F-5 was the first aircraft used by the U.S. Navy's Blue Angels official flight demonstration team at its formation in 1946. The French Navy ( Aéronavale ) was equipped with F6F-5 Hellcats and used them in combat in Indochina . These were painted in Gloss Sea Blue, similar to post-World War II US Navy aircraft until about 1955, but had

300-631: A Navy combat Hellcat ace of WWII from Arizona, was credited with shooting down 9 Japanese planes. He was awarded a DFC, and a Gold Star in lieu of a second DFC. In 2012, Van Haren, Jr. was inducted into the Arizona Aviation Hall of Fame. The British Fleet Air Arm (FAA) received 1,263 F6Fs under the Lend-Lease Act ; initially, it was known as the Grumman Gannet Mark I. The name Hellcat replaced it in early 1943 for

360-543: A Zero 52. Do not try to follow a loop or half-roll with a pull-through. When attacking, use your superior power and high-speed performance to engage at the most favorable moment. To evade a Zero 52 on your tail, roll and dive away into a high-speed turn. Hellcats were the major U.S. Navy fighter type involved in the Battle of the Philippine Sea , where so many Japanese aircraft were shot down that Navy aircrews nicknamed

420-503: A captured Mitsubishi A6M5 model Zero, they showed that the Hellcat was faster at all altitudes. The F6F out-climbed the Zero marginally above 14,000 ft (4,300 m) and rolled faster at speeds above 235 mph (378 km/h). The Japanese fighter could out-turn its American opponent with ease at low speed and enjoyed a slightly better rate of climb below 14,000 ft (4,300 m). The trials report concluded: Do not dogfight with

480-613: A critical success requirement for the Navy. The Corsair was thus released by the Navy to the Marine Corps, which without the need to worry about carrier landings, used the Corsair to devastating effect in land-based sorties. The Hellcat remained the standard USN carrier-borne fighter until the F4U series was finally cleared for U.S. carrier operations in late 1944 (the carrier landing issues had by now been tackled largely due to use of Corsair by

540-567: A larger payload as compared to during VTOL use, while avoiding the complexity of a catapult. The best known example is the Hawker Siddeley Harrier Jump Jet, despite being capable of VTOL take-offs, is usually operated as a STOVL aircraft to increase its fuel and weapons load. STOBAR is a system used for the launch and recovery of aircraft from the deck of an aircraft carrier , combining elements of both STOVL and CATOBAR. Aircraft launch under their own power using

600-1256: A modified French roundel with an image of an anchor. The French Air Force also used the Hellcat in Indochina from 1950 to 1952. The plane equipped four squadrons (including the Normandie-Niemen squadron of WWII fame) before these units transitioned to the F8F Bearcat. The Uruguayan Navy also used them until the early 1960s. A relatively large number of Grumman F6Fs survive to this day, either in museums or in flyable condition. In order of Bu.No. they are: Data from WWII Aircraft Performance Jane's Fighting Aircraft of World War II Standard Aircraft Characteristics General characteristics Performance Armament Related development Aircraft of comparable role, configuration, and era Related lists Carrier-based aircraft Such aircraft are designed for many purposes including air-to-air combat , surface attack , anti-submarine warfare (ASW) , search and rescue (SAR) , transport (COD) , weather observation , reconnaissance and airborne early warning and control (AEW&C) duties. The term

660-512: A pod mounted on a rack beneath the right wing, with a small radar scope fitted in the middle of the main instrument panel and radar operating controls installed on the port side of the cockpit. The later F6F-3N, first flown in July 1943, was fitted with the AN/APS-6 radar in the fuselage, with the antenna dish in a bulbous fairing mounted on the leading edge of the outer right wing as a development of

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720-533: A rugged, well-designed carrier fighter, which was able to outperform the A6M Zero and help secure air superiority over the Pacific theater . In total, 12,275 were built in just over two years. Hellcats were credited with destroying a total of 5,223 enemy aircraft while in service with the U.S. Navy, U.S. Marine Corps, and Royal Navy Fleet Air Arm (FAA). This was more than any other Allied naval aircraft. After

780-617: A ski-jump to assist take-off (rather than using a catapult). These are conventional aircraft however and require arresting wires to land on the ship. The Kuznetsov-class aircraft carriers of the Russian Navy and People's Liberation Army Navy operate the Su-33 (Russia) and J-15 (China) as STOBAR aircraft. Others include the Indian Vikramaditya and Vikrant ; both will operate MiG-29Ks . Prior to World War II,

840-448: A three-bladed Curtiss Electric propeller. Instead of the Wildcat's narrow-track, hand-cranked, main landing gear retracting into the fuselage inherited from the F3F ( a design from the 1930s Grumman FF -1 fighter biplane), the Hellcat had wide-set, hydraulically actuated landing-gear struts that rotated through 90° while retracting backwards into the wings, but with full wheel doors fitted to

900-413: Is generally applied only to fixed-wing aircraft , as naval helicopters are able to operate from a wider variety of ships , including helicopter carriers , destroyers , frigates and container ships. The 1903 advent of fixed-wing aircraft was followed in 1910 by the first flight of an aircraft from the deck of an anchored warship (the United States Navy 's USS  Birmingham ), and in 1912, by

960-536: The British Pacific Fleet was the highest-scoring unit, with 32.5 kills. FAA Hellcats, as with other Lend-Lease aircraft, were rapidly replaced by British aircraft after the end of the war, with only two of the 12 squadrons equipped with the Hellcat at VJ-Day still retaining Hellcats by the end of 1945. These two squadrons were disbanded in 1946. When the war ended, 889 Squadron FAA , equipped with 6 Hellcat Is and II (PR) photo-reconnaissance variants,

1020-558: The Convair 880 . In 1968, Hamilton began delivering automatic, electronic systems for control of cabin pressure in aircraft. Hamilton's mechanical fuel controls, in use since the 1950s, evolved into electronically controlled fuel controls, and eventually, to full-authority digital electronic controls ( FADEC ) for jet engines, which are in use today on many commuter, airline, and military engine applications. Hamilton's environmental systems and early association with NASA were highlighted in

1080-478: The Curtiss P-40 Warhawk , Republic P-47 Thunderbolt , Supermarine Spitfire , and Hawker Hurricane , were often delivered to overseas air bases by aircraft carrier. They would be loaded onto an aircraft carrier in port by cranes, flown off the carrier at sea near their destination under their own power, and land on a friendly airfield ashore. These were not usually combat missions but in some cases

1140-528: The ailerons , and an improved, clear-view windscreen, with a flat armored-glass front panel replacing the F6F-3's curved plexiglass panel and internal armor glass screen. In addition, the rear fuselage and tail units were strengthened, and apart from some early production aircraft, most of the F6F-5s built were painted in an overall gloss sea-blue finish. After the first few F6F-5s were built, the small windows behind

1200-639: The sinking of Prince of Wales and Repulse , the Battle of Taranto , the Attack on Pearl Harbor and numerous other incidents. Following the war, carrier operations continued to increase in size and importance. The vital importance of aircraft carriers, and therefore carrier-capable aircraft, quickly became apparent at the onset of the war in the Pacific where the US's island hopping campaign meant that being able to conduct air operations at sea far from an airbase

1260-462: The 18-cylinder 2,100 hp (1,566 kW) Pratt and Whitney R-2800-18W two-stage supercharged radial engine with water injection and driving a Hamilton-Standard four-bladed propeller. The XF6F-6s were the fastest version of the Hellcat series with a top speed of 417 mph (671 km/h), but the war ended before this variant could be mass-produced. The last Hellcat rolled out in November 1945,

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1320-616: The 1969 Apollo 11 Moon landing – supported by environmental control, fuel cell , and life support systems manufactured by Hamilton Standard. General Motors ' propeller business, which originated with its purchase of Aeroproducts in 1940, was acquired by Hamilton Standard in 1990. In 1999, the United Technologies Corporation acquired the Sundstrand Corporation and merged it with Hamilton to form Hamilton Sundstrand . Sundstrand brought

1380-536: The AN/APS-4; about 200 F6F-3Ns were built. Hellcat night fighters claimed their first victories in November 1943. In total, 4,402 F6F-3s were built through until April 1944, when production was changed to the F6F-5. The F6F-5 featured several improvements, including a more powerful R-2800-10W engine employing a water-injection system and housed in a slightly more streamlined engine cowling, spring-loaded control tabs on

1440-620: The Atlantic Ocean. The two companies were merged in 1929 by the United Aircraft and Transport Corporation . In the early 1930s, Frank W. Caldwell of Hamilton Standard led a team that developed a variable-pitch propeller, using hydraulic pressure and centrifugal force to change the angle of attack of the blades. Caldwell received the 1933 Collier Trophy for this advance in flight propulsion. Later advances included full-feathering and reversible propellers. Hamilton Standard

1500-655: The F6F airframe to incorporate the 2,000 hp (1,500 kW) R-2800-10, driving a three-bladed Hamilton Standard propeller. With this combination, Grumman estimated the XF6F-3s performance would increase by 25% over that of the XF6F-1. The Cyclone-powered XF6F-1 (02981) first flew on 26 June 1942, followed by the first Double Wasp-equipped aircraft, the XF6F-3 (02982), which first flew on 30 July 1942. The first production F6F-3, powered by an R-2800-10, flew on 3 October 1942, with

1560-647: The F6F-5P, receiving the designation Hellcat FR Mk. II. The Pacific War being primarily a naval war, the FAA Hellcats primarily faced land-based aircraft in the European and Mediterranean theaters, so experienced far fewer opportunities for air-to-air combat than their USN/Marines counterparts; nevertheless, they claimed a total of 52 enemy aircraft kills during 18 aerial combats from May 1944 to July 1945. 1844 Naval Air Squadron , on board HMS  Indomitable of

1620-545: The Hellcat was succeeded by the F8F Bearcat , which was smaller, more powerful (powered by uprated Double Wasp radials) and more maneuverable, but entered service too late to see combat in World War II. The Hellcat was used for second-line USN duties, including training and Naval Reserve squadrons, and a handful were converted to target drones . In late 1952, Guided Missile Unit 90 used F6F-5K drones, each carrying

1680-410: The Hellcat. He once described the F6F as "... an outstanding fighter plane. It performed well, was easy to fly, and was a stable gun platform, but what I really remember most was that it was rugged and easy to maintain." During the course of World War II, 2,462 F6F Hellcats were lost to all causes – 270 in aerial combat, 553 to antiaircraft ground and shipboard fire, and 341 due to operational causes. Of

1740-679: The Pacific Theater of Operations. On 22 April 1942, Lieutenant Commander Butch O'Hare toured the Grumman Aircraft company and spoke with Grumman engineers, analyzing the performance of the F4F Wildcat against the Mitsubishi A6M Zero in aerial combat. Buaer's Lt Cdr A. M. Jackson directed Grumman's designers to mount the cockpit higher in the fuselage. In addition, the forward fuselage sloped down slightly to

1800-590: The Royal Navy Fleet Air Arm, which started in 1943). In addition to its good flight qualities, the Hellcat was easy to maintain and had an airframe tough enough to withstand the rigors of routine carrier operations. Like the Wildcat, the Hellcat was designed for ease of manufacturing and ability to withstand significant damage. The Hellcat first saw action against the Japanese on 1 September 1943, when fighters off USS  Independence shot down

1860-431: The U.S. Nimitz class , the U.S. Gerald R. Ford -class , and France's Charles de Gaulle . The use of catapults allows an aircraft carrier to launch large fixed-wing aircraft. For example, the U.S. Navy launches its E-2 Hawkeye AEW aircraft and C-2A Greyhound cargo aircraft with catapults. STOVL take-offs are accomplished with " ski-jumps ", instead of a catapult. STOVL use usually allows aircraft to carry

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1920-480: The U.S. Navy as follows: CATOBAR is a system used for the launch and recovery of aircraft from the deck of an aircraft carrier . Under this technique, aircraft are launched using a catapult-assisted take-off and landing on the ship using arresting wires . Although this system is more costly than alternative methods, it provides greater flexibility in carrier operations, since it allows the aircraft to operate with higher payloads. Ships with CATOBAR currently include

1980-561: The battle the "Great Marianas Turkey Shoot" . The F6F accounted for 75% of all aerial victories recorded by the U.S. Navy in the Pacific. Radar -equipped Hellcat night-fighter squadrons appeared in early 1944. A formidable opponent for the Hellcat was the Kawanishi N1K , but it was produced too late and in insufficient numbers to affect the outcome of the war. U.S. Navy and Marine F6F pilots flew 66,530 combat sorties and claimed 5,163 kills (56% of all U.S. Navy/Marine air victories of

2040-480: The center-section hard point, late-model F6F-3s could carry a total bomb load in excess of 2,000 lb (910 kg). Six 5 in (127 mm) High Velocity Aircraft Rockets (HVARs) could be carried – three under each wing on "zero-length" launchers. Two night-fighter subvariants of the F6F-3 were developed; the 18 F6F-3Es were converted from standard-3s and featured the AN/APS-4 10 GHz frequency radar in

2100-575: The cessation of hostilities, the squadron (which included pilot William Stevenson ) was disbanded and the Hellcats dumped off the Scottish coast (the fate of many lend-lease aircraft that survived the war, which under the terms of the agreement were to be returned to the United States or paid for, while there was no requirement to refund the cost of aircraft that had been lost). After the war,

2160-784: The decks of carriers. Carrier aircraft were used extensively during the Korean and Vietnam wars. Douglas A-4 Skyhawks participated in the first strikes of the Vietnam War in response to attacks against American destroyers in the Tonkin Gulf in August 1964. The A-4's small size and light weight meant a high number could be loaded onto carriers, making them an important resource during the Vietnam war. There are three main types of modern carrier-based aircraft, which are categorised by

2220-441: The earlier F4F, with a folded stowage position parallel to the fuselage with the leading edges pointing diagonally down. Throughout early 1942, Leroy Grumman , along with his chief designers Jake Swirbul and Bill Schwendler, worked closely with the U.S. Navy's Bureau of Aeronautics (BuAer) and experienced F4F pilots, to develop the new fighter in such a way that it could counter the Zero's strengths and help gain air dominance in

2280-431: The engine cowling, giving the Hellcat's pilot good visibility. Based on combat accounts of encounters between the F4F Wildcat and A6M Zero, on 26 April 1942, BuAer directed Grumman to install the more-powerful, 18-cylinder Pratt & Whitney R-2800 Double Wasp radial engine – which was already in use with Chance Vought's Corsair since 1940 – in the second XF6F-1 prototype. Grumman complied by redesigning and strengthening

2340-460: The first flight of an aircraft from the deck of a warship underway (the Royal Navy 's HMS  Hibernia ). Seaplanes and seaplane tender support ships, such as HMS  Engadine , followed. This evolution was well underway by the early 1920s, resulting in ships such as HMS  Argus (1918), Hōshō (1922), USS  Langley (1922), and Béarn (1927). With these developments,

2400-403: The fuselage. Standard armament on the F6F-3 consisted of six .50 in (12.7 mm) M2/AN Browning air-cooled machine guns with 400 rounds per gun. A center-section hardpoint under the fuselage could carry a single 150 US gal (570 L) disposable drop tank , while later aircraft had single bomb racks installed under each wing, inboard of the undercarriage bays; with these and

2460-631: The launched aircraft provided air cover for the ship, and the aircraft could not be recovered by the carrier. Some STOL aircraft, such as the North American Rockwell OV-10 Bronco , have been operated from aircraft carriers and amphibious assault ships in this manner more recently, but this is not common practice. Even very large aircraft such as the Lockheed C-130 Hercules have been successfully landed and launched from large aircraft carriers, but

Grumman F6F Hellcat - Misplaced Pages Continue

2520-491: The main canopy were deleted. The F6F-5N night-fighter variant was fitted with an AN/APS-6 radar in a fairing on the outer-starboard wing. A few standard F6F-5s were also fitted with camera equipment for reconnaissance duties as the F6F-5P. While all F6F-5s were capable of carrying an armament mix of one 20-mm (.79-in) M2 cannon in each of the inboard gun bays (220 rounds per gun), along with two pairs of .50-in (12.7-mm) machine guns (each with 400 rounds per gun), this configuration

2580-414: The need for specialized aircraft adapted for take-offs and landings from the flight decks of those ships became recognized. The significance of air power grew between the wars, driven by the increased range, carrying power, and effectiveness of carrier-launched aircraft, until it became impossible to disregard its importance during World War II, following the loss of many warships to aircraft, including

2640-711: The sake of simplicity, the Royal Navy at that time adopting the use of the existing American naval names for all the U.S.-made aircraft supplied to it, with the F6F-3 being designated Hellcat F Mk. I, the F6F-5, the Hellcat F Mk. II and the F6F-5N, the Hellcat NF Mk. II. They saw action off Norway, in the Mediterranean, and in the Far East. Several were fitted with photographic reconnaissance equipment similar to

2700-517: The ship's speed with even the lightest prevailing winds, combined with a low take-off speed allowed early aircraft to gain flying speed in a very short distance. The most extreme version of this was the battleship platforms used during the 1920s when small, World War I-era biplane fighters such as the Sopwith Camel were launched from only a few dozen feet long mounted atop of a battleship 's forward gun turret . Conventional aircraft, such as

2760-435: The struts that covered the entire strut and the upper half of the main wheel when retracted, and twisted with the main gear struts through 90° during retraction. The wing was mounted lower on the fuselage and was able to be hydraulically or manually folded, with each panel outboard of the undercarriage bay folding backwards from pivoting on a specially oriented, Grumman-patented " Sto-Wing " diagonal axis pivoting system much like

2820-526: The time, Hamilton was the largest manufacturer of aircraft propellers in the world. Standard Steel Propeller had been formed in 1918 in Pittsburgh , Pennsylvania, and Hamilton Aero Manufacturing had been formed in 1920 in Milwaukee , Wisconsin, by Thomas F. Hamilton . Charles Lindbergh 's Spirit of St. Louis used a propeller made by Standard Steel Propeller Company in his historic solo crossing of

2880-493: The total figure, 1,298 were destroyed in training and ferry operations, normally outside of the combat zones. Hamilton McWhorter III , a Navy aviator and a flying ace of World War II, was credited with shooting down 12 Japanese aircraft. He was the first U.S. Navy aviator to become an ace while flying the Grumman F6F Hellcat and the first Navy carrier pilot to achieve double ace status. Arthur Van Haren, Jr. ,

2940-501: The total production being 12,275, of which 11,000 had been built in just two years. This high production rate was credited to the sound original design, which required little modification once production was under way. The U.S. Navy much preferred the more docile flight qualities of the F6F compared with the Vought F4U Corsair, despite the Corsair's superior speed. This preference was especially noted during carrier landings,

3000-468: The type reaching operational readiness with VF-9 on USS  Essex in February 1943. The F6F series was designed to take damage and get the pilot safely back to base. A bullet-resistant windshield was used and a total of 212 lb (96 kg) of cockpit armor was fitted, along with armor around the oil tank and oil cooler. A 250 US gal (950 L) self-sealing fuel tank was fitted in

3060-539: The war) at a recorded cost of 270 Hellcats in aerial combat (an overall kill-to-loss ratio of 19:1 based on claimed kills). Claimed victories were often highly exaggerated during the war. Even so, the aircraft performed well against the best Japanese opponents with a claimed 13:1 kill ratio against the A6M Zero, 9.5:1 against the Nakajima Ki-84 , and 3.7:1 against the Mitsubishi J2M during the last year of

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3120-610: The war, Hellcats were phased out of front-line service in the US, but radar-equipped F6F-5Ns remained in service as late as 1954 as night fighters . Grumman had been working on a successor to the F4F Wildcat since 1938, and the contract for the prototype XF6F-1 was signed on 30 June 1941. The aircraft was originally designed to use the Wright R-2600 Twin Cyclone two-row, 14-cylinder radial engine of 1,700 hp (1,300 kW) (the same engine used with Grumman's then- new torpedo bomber under development ), driving

3180-629: The war. The F6F became the prime ace-maker aircraft in the American inventory, with 305 Hellcat aces. The U.S. successes were not just attributed to superior aircraft; from 1942 onwards, they faced increasingly inexperienced Japanese aviators and had the advantage of increasing numerical superiority. In the ground-attack role, Hellcats dropped 6,503 tons (5,899 metric tonnes) of bombs. The U.S. Navy's all-time leading ace, Captain David McCampbell , scored all of his 34 victories in

3240-491: The weight of most aircraft allowed them to be launched from aircraft carriers under their own power, but required assistance in stopping. Catapults were installed but were used only when the ship was stationary or adequate wind over the deck could not be arranged by sailing into the wind. Even aircraft as large as the North American B-25 Mitchell were launched in this manner. This was possible because

3300-534: Was a division of United Aircraft Corporation (1934) along with Pratt & Whitney (engines). In the early 1950s Hamilton developed the technology to accurately meter fuel in jet engines, and its fuel controls were employed on Boeing 707s and Douglas DC-8s , as well as most other Pratt & Whitney jet engines. In 1952, Hamilton Standard opened its plant in Windsor Locks, Connecticut . In 1958, Hamilton's first environmental control system entered service on

3360-561: Was crucially important. At the onset Japan used 125 Mitsubishi A6M Zeros launched from 6 aircraft carriers to attack the Naval base at Pearl Harbor , with the result of sinking or damaging 21 warships, and destroying 188 aircraft. The war saw the creation of new carrier capable aircraft such as the Vought F4U Corsair , and further variants of the Zero . Often carrier aircraft would have folding wings or wingtips to maximise space conservation on

3420-649: Was done with no cargo and little fuel on board the aircraft. [REDACTED] Media related to Carrier-based aircraft at Wikimedia Commons Hamilton Standard Hamilton Standard was an American aircraft propeller parts supplier. It was formed in 1929 when United Aircraft and Transport Corporation consolidated Hamilton Aero Manufacturing and Standard Steel Propeller into the Hamilton Standard Propeller Corporation. Other members of United Aircraft included Boeing , United Airlines , Sikorsky and Pratt & Whitney . At

3480-522: Was only used on later F6F-5N night fighters. The F6F-5 was the most common F6F variant, with 7,870 being built. Other prototypes in the F6F series included the XF6F-4 (02981, a conversion of the XF6F-1 powered by an R-2800-27 and armed with four 20-mm M2 cannon), which first flew on 3 October 1942 as the prototype for the projected F6F-4. This version never entered production and 02981 was converted to an F6F-3 production aircraft. Another experimental prototype

3540-468: Was preparing to depart from Scotland for the Far East (the squadron had been based at RAF Woodvale since its re-formation after VE Day , and practising carrier operations on HMS Trouncer before moving to HMS Ravager ), to replace 888 Squadron FAA, and intended to photograph Japanese beaches in anticipation of the planned invasion that was forestalled by the Atomic bombings of Hiroshima and Nagasaki . With

3600-528: Was the XF6F-2 (66244), an F6F-3 converted to use a Wright R-2600-15, fitted with a Birman-manufactured mixed-flow turbocharger , which was later replaced by a Pratt & Whitney R-2800-21, also fitted with a Birman turbocharger. The turbochargers proved to be unreliable on both engines, while performance improvements were marginal. As with the XF6F-4, 66244 was soon converted back to a standard F6F-3. Two XF6F-6s (70188 and 70913) were converted from F6F-5s and used

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