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The Cierva W.9 was a British 1940s experimental helicopter with a three-blade tilting-hub controlled main rotor, and torque compensation achieved using a jet of air discharged from the rear port side of the fuselage.
The most visible characteristic of the W.9 was torque compensation using air blown by an engine-driven fan in its hollow tail boom exhausting to port. Of more importance, however, was the hydraulically powered shaft-driven tilting rotor hub with rotational speed variation to give automatic collective pitch control. Development of the rotor system resulted in a tilting hub combined with cyclic pitch control of each blade to minimize control forces. Manual control of collective pitch was added to the automatic collective pitch change system to provide precise vertical control in hover and the ability to cushion a landing from an autorotative descent. The helicopter was destroyed in an accident in 1946 and the project was abandoned.
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Topic: Quest: Guess what is depicted here (Read 1000941 times)
