Eurocopter Launches X3 Propeller-Powered High-Speed Helicopter, Hopes to Outrace Sikorsky's X2
• Lizzie Schiffman via PopSci.comLess than two weeks after Sikorsky's X2 dual-rotor helicopter smashed the rotorcraft speed record, going 250 knots, European group Eurocopter announced a revolutionary high-speed winged helicopter.


