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Sikorsky X2
The Sikorsky X2 is an experimental high-speed compound helicopter with coaxial rotors developed by Sikorsky Aircraft.
==Design and development==
Sikorsky developed the X2 helicopter on a $50 million budget. The design includes expertise gathered from several earlier design projects. The S-69/XH-59A Advancing Blade Concept Demonstrator had shown that high speed was possible with a coaxial helicopter with auxiliary propulsion, but that vibration was excessive;〔 the Cypher UAV expanded the company's knowledge of the unique aspects of coaxial flight control laws with a fly by wire aircraft; and the RAH-66 Comanche developed expertise in composite rotors and advanced transmission design.〔(Sikorsky to Build and Test X2 Technology Demonstrator Helicopter ). ''Sikorsky''〕 Other features include slowed〔(First Flight Of Sikorsky X2 Demonstrator ), ''Aviation Week & Space Technology'', 27 August 2008. Accessed: 9 March 2012. (Archived ) on 7 March 2012.〕 "de-swirling"〔Chandler, Jay. "(Advanced rotor designs break conventional helicopter speed restrictions (page 1) )" (Page 2 ) (Page 3 ). ''ProPilotMag'', September 2012. Accessed: 10 May 2014. (Archive 1 ) (Archive 2 ) (Archive 3 )〕 rigid rotors 2 feet apart, active force counter-vibration inspired by the Black Hawk,〔(X2 marks the spot for radical rotor designs ), ''Flightglobal.com'', 12 June 2007.〕 and using most of the power in forward flight for the pusher propeller rather than the rotor.〔 Test flights and flight simulations were combined to improve test procedure.〔Wilson, J.R. "(Defense Interview: Mark Miller )" ''Defense Media Network'', 9 September 2011. Accessed: 4 October 2014. (Archived ) on 2 November 2012.〕〔"(Sikorsky Innovations Introduces X2 Technology™ Light Tactical Helicopter Simulator )" ''Sikorsky'' PR〕 The fly-by-wire system is provided by Honeywell, the rotor by Eagle Aviation Technologies, anti-vibration technology from Moog Inc, and propeller by Aero Composites.〔 The rotor hub can have 10-20 times the drag of the blade.〔Harris, Franklin D. "(Rotor Performance at High Advance Ratio: Theory versus Test )" page 119 NASA/CR—2008–215370, October 2008. Accessed: 13 April 2014.〕 Sikorsky intended to test hub fairings to reduce drag by 40%, and test flew fairings on the hubs themselves but not the central hub fairing ("aero sail") inbetween the hubs. Sikorsky has since patented a "Standpipe" (fixed tube between rotating rotor axes) suitable for a central hub fairing.〔 (PDF )〕
On 4 May 2009, Sikorsky unveiled a mock-up of a Light Tactical Helicopter derivative of the X2,〔Trimble, Stephen. (Sikorsky unveils mock-up X2 armed scout ). ''Flightglobal.com'', 4 May 2009.〕 and unveiled a prototype in October 2014.〔(S-97 Rollout ) (video ) ''Sikorsky''〕〔Warwick, Graham. "(Sikorsky Talks To Customers About Potential Raider Applications )" ''Aviation Week & Space Technology'', 6 October 2014. Accessed: 3 October 2014. (Photos ) (Archived ) on 3 October 2014〕
In June 2014, Sikorsky/Boeing submitted the SB-1 Defiant helicopter design for the Future Vertical Lift program based on the X2 principle,〔Majumdar, Dave. "(Sikorsky and Boeing Team Submit New Army Helicopter Design )" - News.USNI.org, 17 June 2014. Accessed: 19 June 2014. (Archive )〕〔(Sikorsky and Boeing to pitch ‘X-2’-based design for US Army JMR TD effort ) - Flightglobal.com, February 28, 2013〕 which was approved by the Army in October.〔(U.S. Army Selects Bell and Sikorsky/Boeing to Build Prototypes for Next Generation Helicopter Program ) - News.USNI.org, 3 October 2014〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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