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Mitsubishi 4MS1/ K3M Pine / Type 90 / Ki-7
Watanabe K3M3




Designed by Herbert Smith, the Sopwith designer working in Japan, the Mitsubishi 4MS1 prototype crew trainer made its maiden flight in 1930. A strut-braced high-wing cabin monoplane with fixed wide-track landing gear, the 4MS1 was powered by a single engine. The Ki-7 was the Japanese army prototype of the Mitsubishi K3M naval trainer aircraft. First appearing as the K3M1 in 1931/32 with a 300 hp Hispano-Suiza engine, and was an adaptation of the Fokker Universal for training purposes. The first K3M2 production version entered naval service in 1932 as the Type 90 Crew Trainer, with the pilot and gunner in separate open cockpits, and instructor and two pupils in the enclosed cabin. Later liaison/passenger variants accommodated five passengers in the cabin.
The principal JNAF service version was the K3M2 with a 300 hp Amakaze 11 radial, of which 317 were built by Mitsubishi. Production continued until 1941, and examples pressed into service as liaison aircraft in the postwar period were to be found in a variety of national markings.
Watanabe built 301 K3M3, entering production in 1939. Several, as K3M3-L, were employed on transport duties.
The K3M3 was known as “Pine” during the war.
Engine: Nakajima Kotobuki II-Kai-I, 580 hp / 435kW
Wingspan: 15.78 m / 51 ft 9.25 in
Wing area: 34.5 sq.m / 371.35 sq ft
Length: 9.54 m / 31 ft 4 in
Height: 3.82 m / 12 ft 6 in
Max take-off weight: 2200 kg / 4850 lb
Empty weight: 1360 kg / 2998 lb
Max. speed: 230 km/h / 143 mph
Ceiling: 6390 m / 20950 ft
Range: 790 km / 491 miles
Bombload: 2 x 132 lb / 4 x 30-kg bombs
Armament: 1 x 7.7 mm mg
Crew: 3-5


Mitsubishi K3M PINE




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