The Eurocopter X3 (X-Cubed) is an experimental high-speed compound helicopter under development by Eurocopter. On June, 20th 2013 a Bloomberg L.P. . WORLDS FASTEST HELICOPTER Airbus X3 Hybrid Helicopter 255 Knots 472 km h The Eurocopter X3 (X-Cubed) is an experimental high-speed compound . WORLDS FASTEST HELICOPTER Airbus X3 Hybrid Helicopter 255 Knots 472 km/h. The Airbus X3 (X-Cubed) is an experimental high-speed compound . Слово «самолёт» применялось для обозначения летательных аппаратов ещё в XIX веке.
