Why the SB-1 Defiant lost the Army helicopter contract
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Why the SB-1 Defiant lost the Army helicopter contract
The Sikorsky Boeing SB-1 Defiant combined coaxial rotors and a pusher propeller to achieve high speed and stability. Despite strong performance, range limitations, engine readiness issues, and competition from tiltrotor designs caused the Army to select a different aircraft, leaving the SB-1 without a production future.
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