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Tupolev ANT-7
The Tupolev ANT-7, known by the VVS as the Tupolev R-6 ( R – ''razvedchik'' – reconnaissance), was a reconnaissance aircraft and escort fighter of the Soviet Union. The R-6 traces its roots back to early 1928 when the Soviet Air Force needed a long-range multirole aircraft. The requirements were that it could be used for long-range transport, defensive patrolling, reconnaissance, light bombing and torpedo attacks.
==Design and development==
Under Ivan Pogosski and guided by Andrei Tupolev, TsAGI developed the ANT-7 from the Tupolev TB-1 by scaling it down by about one third.〔 Power for the ANT-7 was intended to come from two – Hispano Suiza engines Bristol Jupiter engines, but the prototype was powered by two – BMW VI engines.
The first flight of the ANT-7 took place on 11 September 1929, piloted by Mikhail Gromov. Flight tests started in March 1930 after TsAGi decided to postpone them until after the winter. That summer, the NII-VVS (''Nauchno-Issledovatel'skiy Institut Voyenno-Vozdooshnykh Seel'' – air force scientific test institute) conducted state tests which revealed tailplane buffeting, which was alleviated by fitting enlarged elevators. The next flight encountered radiator damage and an engine failure, but in spite of this, the ANT-7 passed the state acceptance tests.
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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