Coaxial-Rotor High-Speed Helicopters Making Progress

Credit: Sikorsky
Developing a new type of rotorcraft is difficult, and Sikorsky has encountered challenges advancing its X2 technology from a rapid prototype to product demonstrators. But with return to flight for its S-97 Raider and propulsion system testing for the Sikorsky/Boeing SB-1 Defiant expected this summer...

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