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Nakajima Ki-84The Nakajima Ki-84 Hayate (疾風, "Hurricane") was a single-seat fighter used by the Japanese Imperial Army in World War II. It was the last in Nakajima's line of classic fighters and considered one the best-performing craft from any country. The Allied codename was "Frank"; the Army designation was "Type 4 Fighter" (四式戦闘機). The Ki-84 first flew in March 1943. While the design was solid, a shortage of fuel and construction materials, poor production quality, and lack of skilled pilots kept it from reaching its potential. After the war, a captured example was tested by the U.S. Army using high-octane fuel and achieved a speed of 689 km/h. A total of 3,449 were produced. The Ki-84 was the only army fighter with a four-bladed propeller; this was chosen to reduce the diameter and provide ground clearance. Several interesting experimental variants of the Ki-84 were produced: the wooden Ki-103, the steel (rather than duralumin) Ki-113, and the Ki-116, with the Nakajima Ha-45 engine replaced by a Mitsubishi Ha-112-II. Specifications (Ki-84-Ia) General Characteristics - Crew: one, pilot
- Length: 9.93 m (32 ft 7 in)
- Wingspan: 11.23 m (36 ft 10 in)
- Height: 3.38 m (11 ft 1 in)
- Wing area: 21 m² (226 ft²)
- Empty: 2,665 kg (5,864 lb)
- Loaded: 3,616 kg (7,955 lb)
- Maximum takeoff: 3,898 kg (8,576 lb)
- Powerplant: 1x Nakajima Ha-45-21 18-cylinder radial, 1,485 kW (1,990 hp)
Performance - Maximum speed: 627 km/h (392 mph)
- Range: 2,155 km (1,347 miles)
- Service ceiling: 10,500 m (34,450 ft)
- Rate of climb: 833 m/min (2,734 ft/min)
- Wing loading: 172 kg/m² (35 lb/ft²)
- Power/Mass: 0.41 kW/kg (0.25 hp/lb)
Armament Related content Related development: Tachikawa Ki-103 - Nakajima Ki-113 - Nakajima Ki-116 Comparable aircraft: Designation sequence: Ki-81 - Ki-82 - Ki-83 - Ki-84 - Ki-85 - Ki-86 - Ki-87
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