First flight of the Sikorsky S-67 Blackhawk
Thursday, August 20, 1970
Description
The aircraft was a low-cost tactical helicopter demonstrator, based around the rotors, engines and drive train of the S-61 series aircraft. Source: S-67 Flight Test Program, Richard M. McCutcheon, Paper presented at the 28th Annual National Forum of the American Helicopter Society, May 1972
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