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BB-MAI
BB-MAI ((ロシア語:ББ-МАИ)) was a Soviet light bomber/attack plane prototype aircraft. Designed in 1939 by Pyotr Grushin of the Moscow Aviation Institute (MAI, hence the designation), it was delayed by problems with the new Klimov M-105 engine and eventually only a single prototype was built. While the design was not accepted for serial production, it was the first Soviet aircraft to use a tricycle landing gear and one of the first to feature a supercharger and leading-edge slats.
== Design and development ==
The work on the design was started in 1938, but was delayed by the fact that the intended powerplant, the modern Klimov M-105 engine, was still under development.〔Volkov (ed), p.1〕 In early 1939 work commenced on the first prototype, but proceeded at a very slow pace.〔 The construction team was led by A.A. Lebedinski and A.A. Manucharov.〔 It was not until late 1940 that the prototype was completed and flight-tested by MAI's own test pilot A.N. Grinchik.〔 By that time the Soviet Air Forces lost interest in the design and focused on the more advanced Ilyushin Il-2 instead.〔 As neither this design nor the even more revolutionary Sh-MAI were accepted, the Design Bureau of the Moscow Aviation Institute was disbanded and its head Pyotr Grushin was sent to Kharkov as the new head of a local Aircraft Factory No. 135.〔
The two-spar wings of BB-MAI were of mixed construction typical to other Soviet experimental designs of the era.〔 Each wing was equipped with leading-edge slats and was composed of three crescent-shaped caisson sections, each formed of ''fanera'' - layers of plywood strengthened with glue and bakelite.〔 The fuselage was a typical wooden monocoque reinforced with ''fanera''.〔 The materials used in the BB-MAI were designed at the VIAM Institute.〔 The relatively small wings resulted in relatively high wing loading to maximise the aircraft's cruising speed.〔
The engine was equipped with a new experimental ''TsIAM'' supercharger powered by exhaust fumes.〔 The aircraft was equipped with a modern tricycle landing gear, with the front wheel retracting into a bay in front of the engine's radiator, while main gears retracted into wing bays close to the fuselage.〔
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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