"1"^^ . . . . "The Eurocopter X\u00B3 (X-Cubed) is an experimental high-speed compound helicopter developed by Eurocopter (now Airbus Helicopters). A technology demonstration platform for Eurocopter \"high-speed, long-range hybrid helicopter\" or H\u00B3 concept, the X\u00B3 achieved 255 knots (472 km/h; 293 mph) in level flight on 7 June 2013, setting an unofficial speed record for a helicopter."@en . . .