The X3 demonstrator is based on the Eurocopter AS365 Dauphin helicopter, with the addition of short span wings each fitted with a Rolls-Royce Turbomeca RTM322-01/9a turboshaft engine of 1,693 kW (2,270 hp) driving a tractor propeller. These engines had different pitch to counter the torque effect of the main rotor. As a technology demonstrator, the X3 reached a speed of 472 km/h ( 293 mph) on 7 June 2013.
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