The XFJ-1 was returned to Berliner-Joyce for reconstruction in November 1930, during which the dihedral was eliminated from the upper wing, the vertical tail surfaces were enlarged and a 500hp R-1340D Wasp engine was installed, this being enclosed by a Townend ring and fitted with a spinner.
Redesignated XFJ-2, the fighter resumed its flight test programme at Anacosta on 22 May 1931. The XFJ-2 displayed no improvement in landing characteristics by comparison with the XFJ-1 and proved unstable, and after testing by the US Navy, was discarded as unsatisfactory.
Engine: 500hp R-1340D
Take-off weight: 1291 kg/2846 lb
Empty weight: 953 kg/2101 lb
Wingspan: 8.69 m/29 ft 6 in
Length: 6.28 m/21 ft 7 in
Height: 2.99 m/10 ft 10 in
Wing area: 16.59 sq.m/178.57 sq ft
Max. speed: 285 km/h/177 mph
Range: 837 km/520 miles