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Stealth helicopters are helicopters that incorporate stealth technology to avoid detection.〔Richardson 2001, p. 49.〕 In recent years, designs for blades have emerged that can significantly reduce noise,〔Nusca, Andrew. ("Silent rotor blades could lead to true stealth helicopters." ) ''SmartPlanet'', 2 March 2010. Retrieved: 6 May 2011.〕 which is a major issue for clandestine use of helicopters.〔 A raid on the compound of Osama bin Laden in May 2011 utilized what appeared to be two Sikorsky UH-60 Black Hawks, heavily modified for quieter operations and employing stealth technology to be less visible to radar.〔〔Than, Ker. ("Top Secret Copter Used in Osama bin Laden Raid, Experts Say." ) ''TechNewsDaily'', 6 May 2011. Retrieved: 7 May 2011.〕 ==Examples== There have been a few stealth helicopters:〔Dartford 2004, p. 26.〕〔Singer 2009, p. 206.〕 * A modified Hughes 500P (1972), nicknamed "The Quiet One" had reduced noise operation capability and was used once by the CIA during the Vietnam War to deploy a wiretap.〔Chiles, James R. ("Air America's Black Helicopter." ) ''Air & Space Smithsonian'', February–March 2008, pp. 62–70. ISSN 0886-2257. Retrieved: 6 May 2011.〕 * The Boeing/Sikorsky RAH-66 Comanche (1996-2004) is a stealth helicopter; the type was intended to be used for reconnaissance missions by the US Army, however the development project was cancelled during the prototype stage due to escalating costs and considerable technical issues experienced.〔Geoghegan, Tom and Sarah Shenker. ("Stealth helicopters used in Bin Laden raid." ) ''BBC News'', 5 May 2011. Retrieved: 7 May 2011.〕 * One or multiple of the Sikorsky UH-60 Black Hawks used in the raid upon Osama bin Laden's compound on 1 May 2011 are believed to have featured stealth technologies. These features are said to include specialized materials, and the use of harsh angles and flat surfaces across the exterior fuselage, techniques previously employed upon other stealth aircraft.〔Ross, Brian, Rhonda Schwartz, Lee Ferran and Avni Patel. ("Top Secret Stealth Helicopter Program Revealed in Osama Bin Laden Raid: Experts." ) ''ABC World News''. 4 May 2011.〕〔Naylor, Sean D. and Marcus Weisgerber. ("Army mission helicopter was secret, stealth Black Hawk." ) ''Army Times,'' 4 May 2011. Retrieved: 7 May 2011.〕〔Gunner, Jerry. ("Just what was the mystery US stealth-copter?" ) ''Key Publishing'', 5 May 2011.〕〔Sweetman, Bill. ("Bin Laden Raid Crash Helo Reveals Stealth" ). ''Aviation Week'', 6 May 2011. Retrieved: 8 May 2011.〕〔Trimble, Stephen. ("Pakistan raid reveals US Army’s helicopter secret" ). ''Flight International'', 6 May 2011. Retrieved: 8 May 2011.〕 * Several helicopters, such as the HAL Light Combat Helicopter and Eurocopter Tiger, are said to feature presence-reduction measures or "stealth". The use of advanced composite materials on the airframe has commonly resulted in reductions in an aircraft's radar cross-section (RCS).〔http://www.flightglobal.com/features/aero-india-special/hindustan-aeronautics/〕 In the case of the Eurocopter Tiger, measures were taken to produce minimal visual, radar, infra-red and acoustic signatures to improve battlefield survivability.〔Moxon 1995, p. 103.〕〔("Tiger - Technology." ) ''Eurocopter'', Retrieved: 17 February 2013.〕 HAL's Light Combat Helicopter is reported to feature a digital camouflage system.〔http://www.defenceaviation.com/2011/06/indian-light-combat-helicopter-td-2-successfully-tested-by-hal.html〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「stealth helicopter」の詳細全文を読む スポンサード リンク
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