The Grumman F4F Wildcat is an American carrier-based fighter aircraft that entered service in 1940 with the United States Navy and the British Royal Navy. The British made the first use of the type in combat, initially as a base-defense fighter; later they operated it from escort carriers in the North Atlantic, and later still from fleet carriers, under the name Martlet.Note; British Fleet Air Arm fighters were named after sea birds. Later the "Wildcat" name would be adopted by the RN to simplify supply and prevent possible confusion over delivery orders. By the time of Pearl Harbor the Wildcat was the best fighter available to the United States Navy and Marine Corps, and remained so until mid-1943. The disappointing Brewster F2A Buffalo remained in limited front-line and second-line service through much of 1942, but was withdrawn as soon as enough Wildcats became available.
In the Pacific, Wildcats found themselves matched against various marks of the Mitsubishi A6M Zero. US Navy pilots were reasonably satisfied with the F4F-3 model of the Wildcat, with which they fought through May 1942 and the Battle of the Coral Sea, but were initially much less satisfied with the "improved" F4F-4, which first engaged the Zero at Midway. This mark suffered from increased weight, resulting mainly from the addition of folding wings and a heavier gun battery, without any increase in engine power; this left the F4F-4 with a more sluggish performance than its predecessor. Improved tactics, based on close mutual support by fighters operating as a unit, helped reduce the consequences of reduced performance, and later models (which entered service after the type had been withdrawn from front-line service) were given reduced gun batteries and upgraded engines, giving them better performance in their reduced roles.Wildcat Mk V (FM-1) and Wildcat Mk VI (FM-2). Sections of unsubdivided, unpaginated article, "Grumman F4F Martlet, Part Two: Variants." Available at armouredcarriers.com/grumman-f4f-martlet-variants. Accessed March 10, 2026Lundstrom (2005):444. In the final tally Wildcat pilots claimed an air combat kill-to-loss ratio of 5.9:1 for 1942 and 6.9:1 for the war as a whole.Polmar 2004
In the spring of 1942, lessons learned from early Wildcat combat operations were applied, at the last minute, to prototypes of Grumman's vastly superior F6F Hellcat, the design of which already owed a great deal to the Wildcat. While the Wildcat had better range and maneuverability at low speed, the Hellcat, with c. 50 percent greater power available, could easily outperform the Zero, and superseded the Wildcat in front-line service in 1943-44.Tillman 1991 , pp. 5, 96.TAIC REPORT NO.17, November 1944
From mid-1942 onward production of the Wildcat was subcontracted to a new division of General Motors, the Eastern Aircraft Division, which was established specifically to produce other firms' aircraft, and which ultimately did produce more than three-quarters of all the Wildcats and Avengers that were built.
Design and development
Grumman fighter development began with the two-seat Grumman FF biplane. The FF was the first U.S. naval fighter with a retractable landing gear. The wheels retracted into the fuselage, leaving the tires visibly exposed, flush with the sides of the fuselage. Two single-seat biplane designs followed, the F2F and F3F, which established the general fuselage outlines of what would become the F4F Wildcat. In 1935, while the F3F was still undergoing flight testing, Grumman started work on its next biplane fighter, the G-16. At the time, the U.S. Navy favored a monoplane design, the Brewster F2A-1, ordering production early in 1936. However, an order was also placed for Grumman's G-16 (given the navy designation XF4F-1) as a backup in case the Brewster monoplane proved to be unsatisfactory.Swanborough and Bowers 1976, p. 205.Green 1969, p. 60.
It was clear to Grumman that the XF4F-1 would be inferior to the Brewster monoplane, so Grumman abandoned the XF4F-1, designing instead a new monoplane fighter, the XF4F-2.Donald 1995, pp. 128–134. The XF4F-2 would retain the same, fuselage-mounted, hand-cranked main landing gear as the F3F, with its relatively narrow track. The unusual manually-retractable main landing gear design for all of Grumman's U.S. Navy fighters up to and through the F4F, as well as for the amphibious Grumman J2F utility biplane, was originally created in the 1920s by Leroy Grumman for Grover Loening."Wayne Waters CDR USN(ret)." willyvictor.com. Landing accidents caused by failure of the main gear to fully lock into place were distressingly common.Tillman 1983, p. 12.
The overall performance of Grumman's new monoplane was felt to be inferior to that of the Brewster Buffalo. The XF4F-2 was marginally faster, but the Buffalo was more maneuverable. The Buffalo was judged superior and was chosen for production. After losing out to Brewster, Grumman completely rebuilt the prototype as the XF4F-3 with new wings and tail and a supercharged version of the Pratt & Whitney R-1830 "Twin Wasp" radial engine.Green 1961, pp. 90–96. Testing of the new XF4F-3 led to an order for F4F-3 production models, the first of which was completed in February 1940. France also ordered the type, powered by a Wright R-1820 "Cyclone 9" radial engine, but France fell to the Axis powers before they could be delivered and the aircraft went instead to the British Royal Navy, who christened the new fighter the Martlet. The U.S. Navy officially adopted the aircraft type on 1 October 1941 as the Wildcat. The Royal Navy's and U.S. Navy's F4F-3s, armed with four .50 in (12.7 mm) Browning machine guns, joined active units in 1940.
On 16 December 1940, the XF4F-3 prototype, BuNo 0383, c/n 356, modified from XF4F-2, was lost under circumstances that suggested that the pilot may have been confused by the poor layout of fuel valves and flap controls and inadvertently turned the fuel valve to "off" immediately after takeoff rather than selecting flaps "up". This was the first fatality in the type."Grumman's Willing Wildcat". Air Enthusiast Quarterly, Bromley, Kent., UK, Number 3, 1976, p. 51.
Operational history
Even before the Wildcat had been purchased by the U.S. Navy, the French Navy's Aeronavale and the Royal Navy's Fleet Air Arm (FAA) had ordered the Wildcat, with their own configurations, via the Anglo-French Purchasing Board.
Royal Navy
The Martlet was taken on by the FAA as a single-seat, high-performance fighter to supplement the Fairey Fulmar in carrier service. The Fulmar was a two-seat fighter with good range, but it operated at a performance disadvantage against single-seat fighters. The Royal Navy decided it needed single-seat fighters to go with their two-seaters, but because, in 1940, every modern single-seater that could be produced domestically (Hawker Hurricanes and Supermarine Spitfires) was needed by the Royal Air Force.Buttler 2004Memorandum by the Joint Staff Mission, dated 23rd September 1941, re: The Strategic Importance of Single-Seat Fighters to the Navy. Quoted in non-paginated article, "Grumman F4F Wildcat, Part One: Development," available at armouredcarriers.com/grumman-f4f-martlet-development. Accessed March 10, 2026. for service against German bombers, the Grumman plane was adopted by the Fleet Air Arm as soon as it became available. The first types received, the Martlet I and Martlet II, were aircraft diverted from French and Greek orders after those countries were overrun by the Axis powers in 1940 and 1941, respectively. Martlet Is were used for training and the defense of naval bases, with the type's first combat victory coming on Christmas Day 1940, when a land-based Martlet destroyed a Junkers Ju 88 bomber over the Scapa Flow naval base. This was the first combat victory by a US-built fighter in British service in World War II.Thetford 1978, p. 201.
The type also pioneered combat operations from escort carriers.Gustin Emmanuel. "Grumman F4F Wildcat." skynet.be. Retrieved: 22 April 2010. Six Martlets went to sea aboard the very first operational escort carrier, the converted former German merchant vessel , in September 1941, and shot down several Luftwaffe Fw 200 Condor bombers during highly effective convoy escort operations.Smith, Gordon. "HMS Audacity (D 10)." Naval-History.Net. Retrieved: 11 October 2011.Thetford 1978, p. 202. These were the first of many Wildcats to engage in aerial combat at sea, including Convoy HG 76 to Gibraltar, in December 1941. In March 1945, Wildcats shot down four Messerschmitt Bf 109s over Norway, the FAA's last Wildcat victories.
The Martlet proved popular among prominent Fleet Air Arm pilots, in part because of oddly exaggerated perceptions of its performance, and also in part because it represented tangible evidence of American backing for the war effort.. . . now America was sending Britain the sinews of war in Lend-Lease agreement, and we in 802 [Squadron] were licking our lips in anticipation of a new fighter built especially for high-performance carrier flying by the excellent firm of Grumman. She was called the Wildcat in America and the Martlet in Britain. She was a monoplane, she was fast, and she had big .5 machine guns. We just couldn't wait.
—Capt. Eric "Winkle" Brown, from his autobiography "Wings on My Sleeve", quoted at length in the non-paginated article "Grumman F4F Wildcat, Part One: Development," available at armouredcarriers.com/grumman-f4f-martlet-development. Accessed March 10, 2026. The pilots saw it as, if not a great naval fighter, at least a genuine one, designed by a company which understood what was needed; and, unlike most in the British Air Ministry (which was fixated on the power of 20-mm cannons), they were very pleased with the plane's Browning M2 heavy machine guns.
The last air raid of the war in Europe was carried out by Fleet Air Arm aircraft in Operation Judgement on 5 May 1945. Twenty-eight Wildcat VI aircraft from 846, 853 and 882 Naval Air Squadron, flying from escort carriers, took part in an attack on a U-boat depot near Harstad, Norway. Two ships and a U-boat were sunk with the loss of one Wildcat and one Grumman Avenger torpedo bomber.
US Navy and Marine Corps Pacific The first model of the Wildcat to see action with the U.S. Pacific Fleet was the F4F-3. This mark was generally well-received by American pilots although it did have teething pains: as delivered the type lacked pilot armor,Lundstrom (2005):14. self-sealing fuel tanks,Lundstrom (2005):160-161. and reflector gunsights,Lundstrom (2005):56. and its guns tended to jam;Lundstrom (2005):76. but all these defects were addressed by squadron mechanics, though not always before the planes saw action. Although it was slower in level flight, had a lower rate of climb, and was less maneuverable in those regimes than the Mitsubishi A6M2 Zero, its major opponent in the early part of the war, it was faster and more controllable in a dive, more sturdily built (even before armor was applied), and had a more effective gun battery.Lundstrom (2005):186. Four U.S. Marine Corps F4F-3s played a prominent role in the defense of Wake Island in December 1941, and seven other land-based examples operated off of Midway Island during the battle there in June 1942. Carrier-based F4F-3s served as the U.S. Navy's principal shipboard fighters from Pearl Harbor through the Battle of Coral Sea. Curiously, the F4F-3's reputation among its pilots benefitted from the fact that its pilots exaggerated its capabilities: experiences at Coral Sea left many pilots believing that the type's speed and climbing ability were equal to those of the Zero (things that were manifestly untrue), falling short only in maneuverability.Lundstrom (2005):300.