In 1931, the Imperial Navy instructed Nakajima to design and build, as part of a 6-Shi programme, a two-seat shipboard fighter with secondary dive-bombing capability and provision for an auxiliary fuel tank to suit the aircraft for long-range reconnaissance missions. Of all-metal construction with fabric skinning and designed by Kiyoshi Akegawa, the fighter received the company designation NAF-1. The wings could be folded aft, provision was made for an external 616 Imp gal (280 lt) auxiliary fuel tank and power was provided by a 530 hp Bristol Jupiter engine. Armament comprised two fixed for-ward-firing 7,7-mm guns and a gun of similar calibre on a flexible mount. The sole prototype was completed in the summer of 1932, but delivery to the Navy did not take place until the following year, the NAF-1 being destroyed in a forced landing on 8 April 1933, and the programme being cancelled.
Engine: Bristol Jupiter, 530 hp
Max speed, 173 mph (278 km/h)
Time to 9,845 ft (3 000 m), 7.5 min
Endurance (without external tank), 4 hrs
Empty weight, 2,800 lb (1 270 kg)
Loaded weight, 4,065 lb (1 844 kg)
Span, 35 ft 2.25 in (10,72 m)
Length, 23 ft 7 in (7,19 m)
Height, 9 ft 3 in (2,82 m)
Wing area, 316.36 sq ft (29,39 sq.m)
Armament: two fixed for-ward-firing 7.7-mm guns and 1 gun of 7.7 mm on a flexible mount.