Sikorsky, the venerable helicopter manufacturer, has just broken the helicopter speed record with its X2 vehicle. This unique helicopter has 2 counter rotating main rotors with a push prop in the rear instead of the usual parallel fan blade. The Sikorsky website description of the helicopter:
The X2 uses a single T800 engine to power both the rotors and the tail-mounted variable-pitch propeller, which provides forward thrust to enable the high speed. Other technologies include fly-by-wire flight controls and active vibration control.
In the beginning of the video you can see the X2 Light Tactical Helicopter being developed for military use. [Gizmodo]
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