Home Technology The Sikorsky-Boeing SB-1 Defiant Modern Coaxial Helicopter

The Sikorsky-Boeing SB-1 Defiant Modern Coaxial Helicopter


The Sikorsky-Boeing SB1 DEFIANT will provide revolutionary speed and range capabilities flying 2x faster and farther while increasing the overall maneuverability needed to accomplish the most demanding missions. Sikorsky-Boeing team conducted the first flight of a prototype of the new SB-1 Defiant modern coaxial helicopter at a West Palm Beach, Florida.

source/image(PrtSc): Boeing

DEFIANT is designed to fly at nearly twice the speed and has twice the range of conventional helicopters while retaining the very best, if not better, low-speed and hover performance of conventional helicopters.

SB-1 is equipped with X2 rigid co-axial rotor system technology, which was tested aboard the X2 and S-97 Raider aircraft. Each rotor of the twin co-axial rotor system will revolve in opposite direction and will reduce the net torque of the other rotor in real-time.


A new engine, the future affordable turbine engine (FATE), is to meet the range requirement of 424 km.Compared to conventional helicopters, the counter-rotating coaxial main rotors and pusher propeller offer a 185 km/h speed increase, a 60% combat radius extension, and 50% better performance in high-hot hover performance.