SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Early Soviet autogyro taking off on a test flight on 10 October 1932. An autogyro takes off like an aeroplane, relying on its forward motion to rotate the rotor blades and provide upwards lift. A helicopter, in contrast, uses an engine to power its rotor. The world's first autogyro was developed in Spain in 1923. The first Soviet autogyro, designated TsAGI 2-EA, was built in 1931, with a series of successful test flights in 1932. Photographed in Russia.
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