SB-1 Defiant Concept of Sikorsky-Boeing rigid rotor coaxial compound helicopter

The SB-1’s pusher propeller will allow it to move forward and back at a level attitude or pitch 20˚ nose up or down without moving forward or back, which is impossible with current rotorcraft. The aircraft will be able to cruise at more than 250kt, outpacing the army’s 230kt speed requirement.

The coaxial rotors create very little downwash compared with a traditional helicopter, Shidler says. It is also maritime capable with folding rotor blades.