To meet a 7-Shi (1932) requirement for an advanced single-seat shipboard fighter to succeed the Nakajima A1N (Type 90), a Mitsubishi design team led by Jiro Horikoshi and assisted by Eitaro Sano, Konosuke Nakamura and Tomio Kubo initiated work on the first cantilever low-wing mono-plane to be designed in Japan, the 1MF1O.
Featuring a duralumin monocoque fuselage and a fabric-skinned dur-alumin wing, the 1MF10 was powered by a 710 hp Mitsubishi A-4 14-cylinder two-row radial and carried an armament of two 7,7-mm machine guns. The first of two prototypes was flown in March 1933, but was lost during the following July when the vertical tail surfaces disintegrated during a dive. The second prototype, which was completed shortly afterwards, differed essentially in having a new undercarriage, the three struts of each unit being replaced by single legs enclosed by trouser-type fairings. The 1MF10’s max speed proved to be 30 mph (48 km/h) less than that required by the Imperial Navy at 9,840 ft (3 000 m) and climbing performance was considered inadequate, and the fighter was rejected for series production, the second prototype being lost from a flat spin in June 1934.
Engine: Mitsubishi A-4 14-cylinder two-row radial, 710 hp
Max speed, 199 mph (320 kph) at 9,840 ft (3 000 m)
Time to 10,000 ft (3 050 m), 42 min
Endurance, 3.0 hrs
Empty weight, 2,700 lb (1225 kg)
Loaded weight, 3,479 lb (1578 kg)
Span, 32 ft 9 2/3 in (10,00 m)
Length, 22 ft 8 2/3 in (6,92 m)
Height, 10 ft 10 1/3 in (3,31 m)
Wing area, 190.53 sq ft (17,70 sq.m)
Armament: two 7,7-mm machine guns