The Ki-2 was a low-wing cantilevermonoplane with corrugated metal alloy decking, twin fins with rudders, fixed divided landing gear and was powered by two 435 hp (324 kW) Nakajima Kotobukiradial engines. Maximum speed was 225 km/h (140 mph), normal range 900 km (490 nmi; 560 mi) and maximum take-off weight 4,550 kg (10,030 lb). Single 7.7 mm (0.303 in) machine guns were mounted in a semi-enclosed nose and dorsal positions and it could carry a maximum bomb load of 500 kg (1,100 lb).
The Ki-2 was, like its stable mate the Mitsubishi Ki-1, an adaptation of the Junkers S36 first flown in 1927. Militarized into the Junkers K37 by Junker's Swedish subsidiary AB Flygindustri at Limhamn near Malmö in Sweden, it was able to reach altitudes unattainable by contemporary fighter aircraft. However, by 1930 this advantage had been lost due to developments such as the Bristol Bulldog fighter and Junkers was unsuccessful in selling the design.
In 1931, representatives of the Mitsubishi Nainenki K.K. in Japan visited the Limhamn facilities to study some of the military conversions of Junkers aircraft, and purchased the sole K37 prototype S-AABP (ex D-1252 S36-prototype) as well as all development papers signing a contract for licensed production.
The K37 prototype was brought to Japan and tested in combat in the Manchurian Incident of 1931, following which the IJAAS authorized Mitsubishi to produce both heavy and light bomber variations. The Mitsubishi Ki-1 heavy bomber was a much larger new design following only the general arrangement of the K37 and first flew in August 1932.
The Mitsubishi Ki-2 light bomber version, a minimally re-designed K37, flew for the first time in May 1933. The fuselage was redesigned by Mitsubishi, but the wings were kept largely unchanged, except for additional ailerons. Mitsubishi built total of 113 aircraft and an additional 13 aircraft were built by Kawasaki Kōkūki Kōgyō KK from 1933 to 1936.[1]
An up-graded version was produced in quantity as the Ki-2-II (Army Type 93-II Twin-engined Light Bomber), with nose turret and semi-retractable main landing gear and powered by two 559 hp (417 kW) Mitsubishi Ha-8 (Army Type 94 550hp Air Cooled Radial) engines.
Vulnerable to attack by enemy fighters, and replaced by aircraft with greater range and payload by the late 1930s, both versions ended their flying careers in the training role.
A civilian version of the Ki-2-II named Ohtori (Phoenix) was bought by the Asahi Shimbun newspaper and made a number of long-range record-breaking and "goodwill" flights from 1936 to 1939. Registered J-BAAE, it covered the 4,930 km (2,660 nmi; 3,060 mi) from Tachikawa military air base to Bangkok in 21 hours 36 minutes flying time in December 1936, and in early 1939 achieved a round-China flight of some 9,300 km (5,000 nmi; 5,800 mi).
Ki-2-II (Army Type 93-II Twin-engined Light Bomber)
Final production variant with nose turret and semi-retractable main landing gear, powered by two 559 hp (417 kW) Mitsubishi Ha-8 (Army Type 94 550hp Air Cooled Radial) engines; 61 built.
The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing. p. 2520.
Francillon, Ph.D., René J. (1979). Japanese Aircraft of the Pacific War. London: Putnam & Company Ltd. ISBN0-370-30251-6.
Lake, Jon (2002). Great Book of Bombers. pp86: Zenith Press. ISBN0-7603-1347-4.((cite book)): CS1 maint: location (link)
Mikesh, Robert C. (1990). Japanese Aircraft, 1910-1941. Annapolis, MD: Naval Institute Press. ISBN1-55750-563-2.
Passingham, Malcolm (March 1999). "Les bombardiers de l'Armée japonaise (1920–1935) 2ème partie et fin" [Japanese Army Bombers (1920–1935)]. Avions: Toute l'aéronautique et son histoire (in French) (72): 29–36. ISSN1243-8650.
Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.
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