Sikorsky-Boeing’s SB-1 Defiant Helicopter

It also negates the need for a regular tail rotor, as yaw can be managed using just the top rotors. The SB>1 Defiant uses a pusher prop at the rear, along with active rudders and elevators. At takeoff, this means the aircraft can lift off and move away quickly without needing to tilt forward. At higher speeds, the rear prop provides extra drive and the rudders and elevators help with high speed maneuvering.