![]() | Hafner "Gyroplane" 1935 | ![]() |
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In 1935 Austrian-born Raoul Hafner flew the first combined cyclic-and-collective control system on an autogiro with articulated blades. Although this machine was not capable of hovering, it marks a milestone in helicopter tecnnology. J.P.Spencer "Whirlybirds: A History of the U.S. Helicopter Pioneers", 1998
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