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Hafner Heliogyro
In 1934, Nagler brought out his Heliogyro which had a 90hp Pobjoy radial air-cooled engine, a two-blade rotor and a pusher propeller. The engine could drive the rotor for hovering, when torque was balanced by a vertical surface, or the propeller could be driven for forward flight leaving the rotor to generate lift by autorotation. This single-seat aircraft was tested in Great Britain in 1937.
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