Sikorsky X2 Helicopter

Helicopters generate thrust by the forward tilt of their overhead rotor, a design that allows for stable hovering but means they can’t travel nearly as quickly as a jet or a plane. Sikorsky’s X2 prototype overcomes this limitation by adding counter-rotating rotors and a rear-facing propeller that pushes the craft forward, adding speed. The counter-rotating blades up top combine with electronic controls to keep the craft unshakable while hovering, with minimum effort from the pilot. Sikorsky believes the X2 will break the helicopter speed record of 250 knots this year.
sikorsky.com