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 ...

Sikorsky reported successful flight tests for its 115-pound, battery-powered twin prop-rotor unmanned aircraft.

It may look smaller than a conventional surface warship, but looks can be deceiving. Designated USX-1 Defiant, the new NOMARS shows just how much space aboard a ship is devoted to the crew.

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.

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 ...

Dangerous submarines had to be hunted down by Royal Navy sailors operating in the fjords of Norway. HMS Somerset ran into the vessels while traversing bitterly cold temperatures. The submarines ...