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Ki-28
The sole prototype of the Kawasaki Ki-28
Role	Experimental Fighter AircraftType of aircraft
Manufacturer	Kawasaki Kōkūki Kōgyō K.K.
Designer	Takeo Doi
First flight	1936
Primary user	IJA Air Force
Number built	1

The Kawasaki Ki-28 (キ28, Ki-Nijuhachi), World War II Allied reporting name "Bob", was an experimental fighter aircraft designed for the Imperial Japanese Army and meant as a replacement for the Kawasaki Ki-10. It flew in 1936, but was never produced for actual use as the Army chose the Nakajima Ki-27.

Design & Development

The Ki-28 was initially produced by Kawasaki Kōkūki Kōgyō K.K. in response to Japanese army specifications for a fighter to replace the existing Kawasaki Ki-10. In mid-1935, Kawasaki, Mitsubishi and Nakajima were instructed to build competitive prototypes. The Kawasaki design was based on its earlier, but unsuccessful Ki-5. It was a low-wing cantilever monoplane of all-metal construction, except for fabric-covered control surfaces, with a conventional tail unit, fixed tailskid landing gear and powered by a 596 kW (800 hp) Kawasaki Ha 9-II-Ko liquid-cooled inline V12 engine.

Service trials proved that the Kawasaki Ki-28 was the fastest of the three contenders, but the Nakajima Ki-27 was by far the most maneuverable and had the lowest wing-loading, and on this basis was selected by the Imperial Japanese Army Air Force. Despite losing to the Ki-27, the Ki-28 provided Kawasaki with valuable experience which would later help with development of the Kawasaki Ki-60 and Kawasaki Ki-61 fighters.

Mistakenly believing the Ki-28 to have entered production in Japan as the Army Type 97 Fighter, the Allies assigned it the reporting name "Bob" during World War II.

Operators

Military operators

 Japan

• Imperial Japanese Army Air Force

Specifications

Data from Famous Aircraft of the World, no.76: Japanese Army Experimental Fighters (1), Japanese Aircraft, 1910-1941

General characteristics

• Crew: 1
• Length: 7.9 m (25 ft 11 in)
• Wingspan: 12 m (39 ft 4 in)
• Height: 2.6 m (8 ft 6 in)
• Wing area: 19 m (200 sq ft)
• Empty weight: 1,420 kg (3,131 lb)
• Gross weight: 1,760 kg (3,880 lb)
• Powerplant: × Kawasaki Ha9-II-Ko V-12 liquid-cooled piston engine, 597 kW (801 hp)
• Propellers: 2-bladed fixed-pitch propeller, 2.9 m (9 ft 6 in) diameter

Performance

• Maximum speed: 485 km/h (301 mph, 262 kn)
• Service ceiling: 11,000 m (36,000 ft)
• Time to altitude: 5,000 metres (16,000 ft) in 5 minutes 10 seconds
• Wing loading: 92.6 kg/m (19.0 lb/sq ft)
• Power/mass: 0.33 kW/kg (0.20 hp/lb)

Armament

• Guns: 2 × 7.7 mm (.303 in) machine guns

See also

Related lists

• List of military aircraft of Japan

References

1. ^ Francillon 1979, p. 566.
2. ^ Mikesh & Abe 1990, p. 157.
3. Wieliczko & Szeremeta 2004, pp. 17–19.
4. FAOW 1976, p. 2.
5. Mikesh & Abe 1990, p. 158.

Bibliography

• Francillon, René J. (1979). Japanese aircraft of the Pacific War (2nd ed.). London: Putnam. ISBN 0-370-30251-6.
• Mikesh, Robert C.; Abe, Shorzoe (1990). Japanese Aircraft 1910-1941. Annapolis, MD: Naval Institute Press. ISBN 1-55750-563-2.
• "Japanese Army Experimental Fighters (1)". Famous Aircraft of the World. No. 76. Tokyo, Japan: Bunrin-Do Co. August 1976.
• Wieliczko, Leszek A.; Szeremeta, Zygmunt (2004). Nakajima Ki 27 Nate (in Polish and English). Lublin, Poland: Kagero. ISBN 83-89088-51-7.

• Kawasaki aircraft
• 1930s Japanese fighter aircraft
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• Low-wing aircraft
• Abandoned military aircraft projects of Japan