|Nakajima Army Type 91 Fighter|
|Manufacturer||Nakajima Aircraft Company|
|Status||out of service|
|Primary user||Imperial Japanese Army|
Designed in response to an Army requirement of 1927, the Type 91 was developed from the NC series of fighter prototypes. The prototype was the sixth machine under that designation but was a fundamentally distinct airframe design. Compared to the earlier NC, the Type 91 had a smaller wing, relocated fuel tank and wing-bracing struts, Townend ring-type cowling, new design tail and undercarriage. It first flew in 1931.
The Army ordered the new aircraft as the Nakajima Army Type 91 Fighter and the first deliveries took place late in 1931. However, issues arose with both directional stability and centre of gravity, with the result that the type was delayed entering service.
Between 1931 and 1934, 420 aircraft were constructed (including 100 by Ishikawajima; 23 of the total were Type 91-2, powered by a 432 kW (580 hp) Nakajima Kotobuki 2 radial engine. This version first flew in July 1934.
The Type was supplanted in service by the Kawasaki Army Type 95 Fighter in 1936-7.
- Nakajima Army Type 91-1 Fighter
- Main production version, powered by 336 kW (450 hp) Nakajima built Jupiter radial engine.
- Nakajima Army Type 91-2 Fighter
- Improved version, powered by Nakajima Kotobuki. 21 built.
- The Chinese Nationalist Air Force purchased 12 Type 91-1 fighters which would later end up fighting against the Japanese during the Second Sino-Japanese War.
Specifications (Nakajima Army Type 91-1 Fighter)
- Length: 7.27 m (23 ft 10 in)
- Wingspan: 11 m (36 ft 1 in)
- Height: 2.79 m (9 ft 2 in)
- Wing area: 20 m2 (220 sq ft)
- Empty weight: 1,075 kg (2,370 lb)
- Gross weight: 1,530 kg (3,373 lb)
- Powerplant: 1 × Nakajima Jupiter VII 9-cylinder air-cooled radial piston engine, 340–390 kW (450–520 hp)
- Propellers: 2-bladed wooden fixed-pitch propeller
- Maximum speed: 300 km/h (190 mph, 160 kn)
- Endurance: 2 hours
- Service ceiling: 9,000 m (30,000 ft)
- Time to altitude: 3,000 m (9,843 ft) in 4 minutes
- Wing loading: 76.5 kg/m2 (15.7 lb/sq ft)
- Power/mass: 0.2191 kW/kg (0.1333 hp/lb)
- Guns: 2 × fixed, forward-firing 7.7 mm (0.303 in) machine guns
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