Defiant was an advanced coaxial helicopter that promised greater speed, maneuverability, and stealth. A collaboration between Sikorsky and Boeing, it competed in the U.S. Army’s Future Vertical Lift ...

A new helicopter will give the U.S. Army a cutting edge on the battlefield- and put the “quick” in Quick Reaction Force. The Sikorsky-Boeing SB-1 Defiant took its first official ...

China appears to be embarking upon an ambitious, long-term plan to keep pace with U.S. advances in helicopter technology by emphasizing speed; stealth; and innovative, next-generation designs.