Sikorsky company has tested a new model of X2 is capable of speeds up to 450 km / h thanks to the new design. In the tail of the helicopter is another Variable speed rotor, markedly increases the horizontal speed of the machine. All screws are working on one engine with an index of T800. Helicopters of this class of speeds up to 270 km/h, and the world speed record of helicopters registered in 1986, was until recently at 400 km/h.
Sikorsky X2 - The Fastest Helicopter In The World [Video]