The XFL-1 experimental shipboard fighter was developed in parallel with the XP-39 Airacobra, and was flown for the first time on 13 May 1940. Powered by a 1150hp Allison XV-1710-6 12-cylinder liquid-cooled engine, the XFL-1 differed from its land-based counterpart primarily in having a tailwheel undercarriage and underwing radiators. The airframe was re-stressed for shipboard operation, and proposed armament comprised a single 12.7mm machine gun or a 37mm cannon firing through the propeller hub and a pair of fuselage-mounted 7.62mm guns, although, in the event, no armament was installed. The XFL-1 failed its carrier qualification trials and further development was abandoned at the beginning of 1942.
