The U.S. Army Aviation Technology Directorate (AATD) selected the Sikorsky-Boeing team to continue the development of the SB1 Defiant, a medium-lift helicopter configured to Sikorsky’s X2 coaxial design, through flight testing. First flight for the program is expected in 2017.
The Defiant aircraft will feature counter-rotating rigid main rotor blades for vertical and forward flight, a pusher propeller for high-speed acceleration and deceleration, and an advanced fly-by-wire flight control system.

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