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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 ...
The Sikorsky-Boeing SB-1 Defiant was designed to replace the UH-60 Black Hawk as part of the U.S. Army’s Future Vertical Lift program. Featuring twin coaxial rotors and a rear propeller, it combined ...
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