Europcopter X3

The Eurocopter X3 (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 achieved 255 knots (472 km/h; 293 mph) in level flight on 7 June 2013, setting an unofficial helicopter speed record.

 

https://www.youtube.com/watch?v=D5HqmArWfH4

 

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