Developed for the U.S. Army’s Joint Multi-Role Technology Demonstration, precursor to the Future Vertical Lift program, the Sikorsky-Boeing SB-1 Defiant is a coaxial-rotor compound helicopter. The aircraft is to fly in 2018, and the team is aiming for a speed of 250 kt., with increased range and hot-and-high performance compared with current helicopters. A critical goal is to demonstrate the tactical value of the configuration, with its rigid coaxial rotors and pusher propulsor, to the ...

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