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Grumman F6F Hellcat

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.

Design and development
XF6F " folding wings deployed for takeoff (circa 1943-44). 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 (the same engine used with Grumman's then-new torpedo bomber under development), driving 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 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. 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 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 the engine cowling, giving the Hellcat's pilot good visibility. Change of powerplant 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 the F6F airframe to incorporate the 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. Further development 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 of cockpit armor was fitted, along with armor around the oil tank and oil cooler. A self-sealing fuel tank was fitted in the fuselage. 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 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 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. After the first few F6F-5s were built, the small windows behind 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 was only used on later F6F-5N night fighters. The F6F-5 was the most common F6F variant, with 7,870 being built. Another experimental prototype 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 the 18-cylinder 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 , but the war ended before this variant could be mass-produced. The last Hellcat rolled out in November 1945, 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. ==Operational history==
Operational history
U.S. Navy and Marines The U.S. Navy greatly preferred the more docile flight characteristics of the F6F over the Vought F4U Corsair, despite the Corsair's superior speed. This preference was particularly evident during carrier landings, which were a critical requirement for the Navy's success. Consequently, the Navy transferred the Corsair to the Marine Corps, which, not having to worry about carrier landings, utilized the Corsair for land-based sorties. The Hellcat remained the standard carrier-borne fighter for the U.S. Navy until the F4U series was finally cleared for U.S. carrier operations in late 1944. By that time, the carrier landing issues had largely been resolved, thanks in part to the Royal Navy Fleet Air Arm's use of the Corsair, which began 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. Grumman F6F-5 ready for launch from off Okinawa in May 1945: Most of the F6F-5s built were painted overall glossy sea blue. The Hellcat first saw action against the Japanese on 1 September 1943, when fighters off shot down 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. 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. Sortie, kill, and loss figures inspects a Japanese-captured F6F-5 in Yokosuka in September 1945. 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 the war) at a recorded cost of 270 Hellcats in aerial combat (an overall kill-to-loss ratio of 19:1). The aircraft performed well against the various 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 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. 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 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., a Navy combat Hellcat ace of WWII from Arizona, was credited with shooting down 9 Japanese planes. He was awarded two Distinguished Flying Crosses, and was inducted into the Arizona Aviation Hall of Fame in 2012. British use in June 1944 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 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 the F6F-5P, receiving the designation Hellcat FR Mk. II. In the European and Mediterranean theaters, these FAA Hellcats primarily faced land-based aircraft , 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 of 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. Postwar use , in 1954. After the war, 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. 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. French Naval Aviation 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 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 F6F-5s until the early 1960s. ==Variants==
Variants
XF6F prototypes ;XF6F-1 :First prototype, powered by a two-stage mechanically supercharged Wright R-2600-10 Cyclone 14 radial piston engine. ;XF6F-2 :The first XF6F-1 prototype revised and fitted with a turbocharged Wright R-2600-16 Cyclone radial piston engine. R-2600 replaced by turbocharged R-2800-21. (1943) ;XF6F-3 : Second prototype fitted with a two-stage supercharged Pratt & Whitney R-2800-10 Double Wasp radial piston engine. ;XF6F-4 :One F6F-3 fitted with a two-stage, two-speed supercharged Pratt & Whitney R-2800-27 Double Wasp radial piston engine. ;XF6F-6 :Two F6F-5s that were fitted with the Pratt & Whitney R-2800-18W radial piston engine, and four-bladed propellers. Series production ;F6F-3 (British designation Gannet F. Mk. I, and then later, renamed Hellcat F. Mk. I, January 1944) :Single-seat fighter, fighter-bomber aircraft, powered by a Pratt & Whitney R-2800-10 Double Wasp radial piston engine. ;F6F-3E :Night fighter version, equipped with an AN/APS-4 radar in a fairing on the starboard outer wing. ;F6F-3K :A radio-controlled target drone. ;F6F-3N :Another night fighter version, equipped with a newer AN/APS-6 radar in a fairing on the starboard outer wing. ; ;F6F-5 Hellcat (British Hellcat F. Mk. II) :Improved version, with a redesigned engine cowling, a new windscreen structure with an integral bulletproof windscreen, revised ailerons, and strengthened tail surfaces; powered by a Pratt & Whitney R-2800-10W (-W denotes Water Injection) radial piston engine. First approximately 1500 F6F-5 retained the small windows aft of the sliding canopy of the F6F-3. ;F6F-5K Hellcat :A number of F6F-5s and F6F-5Ns were converted into radio-controlled target drones. ;F6F-5N Hellcat (British Hellcat N.F. Mk II) :Night fighter version, fitted with an AN/APS-6 radar. Some were armed with two 20 mm (0.79 in) AN/M2 cannon in the inner wing bays and four 0.50 in (12.7 mm) M2 Browning machine guns in the outer. ;F6F-5P Hellcat :Small numbers of F6F-5s were converted into photo-reconnaissance aircraft, with the camera equipment being fitted in the rear fuselage. ;Hellcat FR. Mk. II :This designation was given to British Hellcats fitted with camera equipment. ;FV-1 :Proposed designation for Hellcats to be built by Canadian Vickers; cancelled before any built. ==Operators==
Operators
; • French Naval AviationFrench Air Force ; • Royal Navy Fleet Air Arm :*Training units, and non-operational units ::*706 Naval Air Squadron Crew Pool & Refresher Flying Training School. ::*709 Naval Air Squadron Ground Attack School. ::*731 Naval Air Squadron Night Fighter Training School. ::*778 Naval Air Squadron Service Trials Unit (STU) ::*891 Naval Air Squadron not operational at war's end. ::*1847 Naval Air Squadron merged into 1840, not operational. :*East Indies units ::*800 Naval Air Squadron , first operational unit ::*804 Naval Air Squadron , , , ::*808 Naval Air Squadron ::*888 Naval Air Squadron detachments only ::*896 Naval Air Squadron ::*898 Naval Air Squadron / :*Atlantic & Mediterranean units ::*881 Naval Air Squadron ::*892 Naval Air Squadron ::*1832 Naval Air Squadron :*Pacific units ::*885 Naval Air Squadron ::*1839 Naval Air Squadron NAS Eglington/ ::*1840 Naval Air Squadron ::*1844 Naval Air Squadron ; • United States NavyUnited States Marine Corps ; • Uruguayan Navy ==Surviving aircraft==
Surviving aircraft
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: United Kingdom ;On display ;;F6F-5 • 79779 – Fleet Air Arm Museum in RNAS Yeovilton. United States ;Airworthy ;;F6F-3 • 41476 – based at the Collings Foundation in Stow, Massachusetts. • 41930 – privately owned in Houston, Texas. ;;F6F-5 • 70222 – based at Commemorative Air Force (Southern California Wing) at Camarillo Airport (former Oxnard AFB) in Camarillo, California. • 78645 – based at Fagen Fighters WWII Museum in Granite Falls, Minnesota. • 79863 – based at Flying Heritage Collection in Everett, Washington. • 80141 - based at Lewis Air Legends in San Antonio, Texas. • 94204 – based at Erickson Aircraft Collection in Madras, Oregon. • 94473 – based at Palm Springs Air Museum in Palm Springs, California. ;On display ;;F6F-3 • 25910 – National Naval Aviation Museum at NAS Pensacola in Pensacola, Florida. • 41834 – Steven F. Udvar-Hazy Center of the National Air and Space Museum in Chantilly, Virginia. • 42874 – San Diego Aerospace Museum in San Diego, California. • 66237 – Naval Air Station Wildwood Aviation Museum at Cape May Airport in Lower Township, New Jersey. ;;F6F-5 • 77722 – Naval Air Facility Washington at Joint Base Andrews • 79192 – New England Air Museum in Windsor Locks, Connecticut. • 79593 – /Patriots Point Naval & Maritime Museum in Mount Pleasant, South Carolina. • 79683 – Air Zoo in Kalamazoo, Michigan. • 94203 – National Naval Aviation Museum at NAS Pensacola in Pensacola, Florida. • 94263 – Cradle of Aviation Museum in New York. It is on loan from the USMC Museum in Quantico, Virginia. ;Under restoration or in storage ;;F6F-3 • 40467 - to airworthiness by Yanks Air Museum in Chino, California. • 43014 – in storage at the Fantasy of Flight in Polk City, Florida. ;;F6F-5 • 72094 – to airworthiness by private owner in Caldwell, Idaho. • 79133 – to airworthiness by private owner in Wilmington, Delaware. • 80040 – to airworthiness by private owner in Wilmington, Delaware. • 94038 – to airworthiness by private owner in Wilmington, Delaware. • 94385 – to airworthiness by private owner in Livermore, California. ==Specifications (F6F-5 Hellcat)==
Specifications (F6F-5 Hellcat)
, leads a formation of CVG-3 aircraft (a Helldiver, Avenger and Bearcat) in 1946. ==See also==
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