Sikorsky to test coaxial helicopter rotors
United Technologies subsidiary Sikorsky Aircraft announced at the American Helicopter Society annual forum earlier this month that it plans to build an exp

United Technologies subsidiary Sikorsky Aircraft announced at the American Helicopter Society annual forum earlier this month that it plans to build an experimental helicopter using a coaxial main rotor system that it says will achieve cruise speeds well above that of conventional helicopters. Coaxial helicopters have two counterrotating rotors on the same vertical axis.

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