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Mitsubishi 3MT5
The Mitsubishi 3MT5 was a Japanese bomber of the 1930s. It was a twin-engined biplane that was intended to operate from Japanese aircraft carriers, but proved to be unsuitable for carrier use, and the eleven aircraft built were instead used as land-based trainers.
==Design and development==
In 1929, the Imperial Japanese Navy Air Service developed a requirement for a large twin-engined carrier-based torpedo-bomber, with an order being placed with Mitsubishi in January 1930. Design of the new aircraft has entrusted to a team led by the British engineer G. E. Petty. The design process was prolonged, as the Navy kept changing their requirements, and the first of eleven prototypes, designated 3MT5 by Mitsubishi and the 7-''Shi'' Twin-engine Carrier Aircraft by the Navy, was completed in September 1932. The new torpedo bomber was a two-bay biplane with folding wings, and was of mixed construction, with a wood and metal fuselage and a metal wing structure with fabric covering. It had a fixed tailwheel undercarriage,〔Miksh and Abe 1990, pp. 168–169.〕 and was powered by two Mitsubishi A4 radial engines (later developed into the Mitsubishi Kinsei〔Miskesh and Abe 1990, p. 173.〕) driving two-bladed propellers.〔
The first prototype made its maiden flight on 19 October 1932, with a further three prototypes (all designated 3MT5A by Mitsubishi) being completed in 1932. The remaining five prototypes (3MT5) were completed in 1933 incorporating modifications based on initial testing, with a twin tail replacing the single fin and rudder of the first four aircraft, three-bay wings and four-bladed propellers being fitted. Despite these changes, the aircraft was difficult to control, and suffered from severe vibration, which on one test flight in March 1934, resulted in all four ailerons being torn off the wings of one of the prototypes, which was safely landed. These problems could not be resolved, and the lengthy development meant that the type was now obsolete, so no production followed.〔
There is sometimes confusion between this aircraft and the 'Mitsubishi Navy 8-shi Experimental Attack Bomber' (also designated Mitsubishi G1M), which was a monoplane, two entirely different aircraft.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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