Nakajima Y3B /7-SHI


To meet a 7-Shi (1932) requirement for an advanced single-seat shipboard fighter with which the Imperial Navy hoped to replace the A2N1 that had just been adopted, Nakajima was instructed in April 1932 to develop a suitable aircraft in competition with Mitsubishi. Whereas the latter elected to adopt a cantilever low-wing monoplane configuration (1MF10), Nakajima chose to base its contender on the Army’s Type 91 parasol monoplane then entering service. A single prototype of a navalised Type 91 was completed in the autumn of 1932, this differing from the Army fighter essentially in having a 560 hp Nakajima Kotobuki 5 engine driving a three-bladed propeller, wheel spats and an arrester hook. Armament remained the standard two 7,7-mm guns. The 7-Shi fighter was considered to offer an insufficient advance to warrant further development.

Engine: Nakajima Kotobuki 5, 560 hp
Max speed: 184 mph (296 km/h).
Empty weight: 2,425 lb (1100 kg)
Loaded weight: 3,527 lb (1 600 kg).
Span: 36 ft 1 in (11,00 m)
Length: 23 ft 7.5 in (7,20 m).
Height: 10 ft 6 in (3,20 m)
Wing area: 215.28 sq ft (20,00 sq.m).