Kawasaki Ki-78

Ki-78
Role	High speed research aircraft
National origin	Japan
Manufacturer	Kawasaki Kokuki Kogyo K.K.
Design group	Aeronautical Research Institute of the University of Tokyo
First flight	26 December 1942^[1]
Number built	1 completed + 1x mock-up and the partially complete 2nd prototype^[1]

The Kawasaki Ki-78, originally given the designation KEN III (Kensan III - research III), was a high speed research aircraft, also intended to attempt breaking the World Absolute speed record.^[1]

Design and development

The Kawasaki Ki-78 was a high-speed research aircraft developed to investigate laminar profile wings with high wing loadings. Early in 1938 a high-speed research program was started at the Aeronautical Research Institute of the University of Tokyo for a small single-seat aircraft.^[1]

The Ki-78, designed at the Aeronautical Research Institute and built at Kawasaki Kokuki Kogyo K.K. to investigate flying behaviour at very high speed, featured a streamlined minimum cross-section fuselage fitted with a licence-built Daimler-Benz DB 601A engine. For short duration power boost methanol/water injection was used, and cooling was improved by a 45 kW (60 hp) turbine driven cooling fan for the radiators.^[1]

All-metal construction was used in combination with a small thin wing with a laminar flow profile and a sharp leading edge.^[1]

Operational history

By the outbreak of the war, the whole project was taken over by the Imperial Japanese Army who gave it the military type designation Ki-78. Kawasaki received the order to build two prototypes of the Ki-78, construction of which was started in September 1941. The first was completed more than a year later and was flown for the first time on 26 December 1942. A feasibility study to improve the KI-78 flight performance showed that extensive airframe modifications were needed and consequently the project was officially terminated after the 32nd flight on 11 January 1944; the second Ki-78 was never completed.^[1]

Specifications (KEN III / Ki-78)

Data from Japanese Aircraft of the Pacific War^[1]

General characteristics

Crew: 1
Length: 8.1 m (26 ft 7 in)
Wingspan: 8 m (26 ft 3 in)
Height: 3.07 m (10 ft 1 in)
Wing area: 11 m² (120 sq ft)
Empty weight: 1,930 kg (4,255 lb)
Gross weight: 2,300 kg (5,071 lb)
Powerplant: 1 × Daimler-Benz DB 601A V-12 inverted liquid-cooled piston engine rated at 1,160 kW (1,550 hp) with Water/Methanol injection for short durations

Performance

Maximum speed: 700 km/h (435 mph; 378 kn) at 3,500 m (11,500 ft)
Range: 600 km (373 mi; 324 nmi)
Service ceiling: 8,000 m (26,000 ft)
Wing loading: 209 kg/m² (43 lb/sq ft)
Power/mass: 0.373 kW/kg (0.2273 hp/lb)

References

1 2 3 4 5 6 7 8 Francillon, Rene (1979). Japanese Aircraft of the Pacific War. London: Putnam & Company Limited. ISBN 0 370 30251 6.

External links

Ki-78 article

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