High-speed: The X3 is equipped with two turboshaft engines that power a five-blade main rotor system and two propellers installed on short-span fixed wings, creating an advanced transportation system offering the speed of a turboprop-powered aircraft and the full hover flight capabilities of a helicopterFrom The Daily Mail:
A revolutionary winged helicopter that hopes to break the speed record has finally been unveiled after months of secrecy.
European group Eurocopter showed off the high-speed aircraft in a bid to counter U.S. rival Sikorsky's efforts to break the speed barrier by rewriting rotorcraft design rules.
The X3 hybrid helicraft - which combines forward-facing propellers astride two short aircraft wings with the familiar overhead rotor blades seen on any normal helicopter - is half-plane, half-helicopter in design.
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