The material presented in this book describes the history of the development, testing and limited operations of early Soviet autogyros. As in the rest of the world, autogyros appeared in the Soviet Union in a period of full exploration of the skies by airplanes and after the first unsuccessful experiences with helicopters.
The I-15, I-16 and I-153 fighters were the world's first mass-produced fighters. Some 17,000 Polikarpovs had been manufactured by the time production ceased in 1941. They served with the Republicans in the Spain, the Chinese against Japan in 1937-38, and the Soviets against both Japan in the Nomonhan Incident and Finland during the Winter War.
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