| The F4F-1 began as an unbuilt biplane design entered in a U.S. Navy competition, being beaten by the monoplane Brewster F2A-1 design. This resulted in its complete remodeling into the monoplane XF4F-2.[1] This was evaluated against the Buffalo, but although the XF4F-2 was marginally faster, the Buffalo was otherwise superior and was chosen for production.[1]. Grumman's prototype was then rebuilt as the XF4F-3 with new wings and tail and a supercharged version of the Pratt & Whitney R-1830 'Twin Wasp' radial engine.[1][2] Testing of the 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 Wright R-1820 'Cyclone 9' radial engines, but France fell before they could be delivered and they ultimately went to the British Royal Navy, which called them 'Martlet I's. Both the British aircraft and the U.S. Navy's F4F-3 with an armament of four .50 caliber Browning machine guns, joined active units in 1940.[2] All versions of the Wildcat used fuselage mounted, hand-cranked landing gear with a relatively narrow track, making landing accidents, where the landing gear were not fully locked into place, distressingly common.[3] This unusual main landing gear design was originally designed by Grover Loening, for his firm's aircraft in the 1920s, and as Leroy Grumman had worked for Loening before starting up his own company, it was readily licensed to Grumman and was used earlier on all of Grumman's fighter biplanes (from the FF-1 through the F3F) of the 1930s and on the J2F Duck amphibious biplane.[4] The name 'Wildcat' was officially adopted on 1 October 1941. | 
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