With an aerodynamic fairing installed on the rotor head, the X3 demonstrated a speed of 255 knots (293 mph; 472 km/h) in level flight and 263 knots (303 mph; 487 km/h) in a shallow dive on 7 June 2013, beating the
Sikorsky X2's unofficial record set in September 2010, and thus becoming the world's fastest non-jet ...
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