[postlink]http://voiceofvietnamese.blogspot.com/2011/06/helicopter-of-future-sikorsky-x2_23.html[/postlink]http://www.youtube.com/watch?v=mOpRp9Fb4w4endofvid
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The Sikorsky X2 is an experimental compound helicopter with coaxial rotors under development by the American aircraft manufacturer Sikorsky Aircraft.
Sikorsky has incorporated decades of company research and development into X2 Technology helicopters. The S-69/XH-59A Advancing Blade Concept Demonstrator showed high speed was possible with a coaxial helicopter and auxiliary propulsion; the Cypher UAV expanded company knowledge of the unique aspects of flight control laws in a fly by wire aircraft with coaxial rotors; and the RAH-66 Comanche, which developed expertise in composite rotors and advanced transmission design.
On 4 May 2009, Sikorsky unveiled a mock-up of a Light Tactical Helicopter derivative of the X2.
On 15 September 2010, test pilot Kevin Bredenbeck achieved Sikorsky's design goal for the X2 when he flew it at a speed of 250 knots (290 mph; 460 km/h) in level flight, an unofficial speed record for a helicopter.
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[starttext]
The Sikorsky X2 is an experimental compound helicopter with coaxial rotors under development by the American aircraft manufacturer Sikorsky Aircraft.
Sikorsky has incorporated decades of company research and development into X2 Technology helicopters. The S-69/XH-59A Advancing Blade Concept Demonstrator showed high speed was possible with a coaxial helicopter and auxiliary propulsion; the Cypher UAV expanded company knowledge of the unique aspects of flight control laws in a fly by wire aircraft with coaxial rotors; and the RAH-66 Comanche, which developed expertise in composite rotors and advanced transmission design.
On 4 May 2009, Sikorsky unveiled a mock-up of a Light Tactical Helicopter derivative of the X2.
On 15 September 2010, test pilot Kevin Bredenbeck achieved Sikorsky's design goal for the X2 when he flew it at a speed of 250 knots (290 mph; 460 km/h) in level flight, an unofficial speed record for a helicopter.
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