S-66
In 1964 Sikorsky submitted the S-66 project to the US Army for the Advanced Aerial Fire Support System (AAFSS) requirement, which called for an aircraft with a maximum speed of approximately 418km/h and ten minutes' hovering capability. The S-66 looked very much like the Lockheed AH-56A Cheyenne (which won the contest), but had a Rotorprop tail rotor which could rotate its axis through 90° to act both as a conventional anti-torque rotor in horizontal flight and as a pusher propeller, thereby transforming the S-66 into a compound aircraft in cruising flight.
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