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Sikorsky S-97 Raider
The Sikorsky S-97 Raider is a proposed high-speed scout and attack compound helicopter〔 based on the Advancing Blade Concept (ABC),〔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 )〕 under development by Sikorsky Aircraft. Sikorsky planned to offer it for the United States Army's Armed Aerial Scout program, along with other possible uses.〔Trimble, Stephen. ("Sikorsky unveils S-97 for high-speed scout and attack helo" ). ''Flightglobal'', 20 October 2010.〕 S-97 made its maiden flight on 22 May 2015.〔
==Background==
Sikorsky's earliest attempt at a fast helicopter with stiff coaxial rotors was the four-engine XH-59A flown in the 1970s. Its top speed was over 260 knots but its excessive fuel consumption, vibration and complexity requiring the full-time attention of two pilots led to its cancellation.〔Warwick, Graham, Rotary redefined, Aviation Week & Space Technology, October 6, 2014, p.52〕 These problems were largely solved on another attempt; the Sikorsky X2 technology demonstrator. First proposed in response to a Request for Information for the Armed Aerial Scout (AAS) program in March 2010,〔 the S-97 was formally launched on 20 October 2010. It was intended as a contender for a United States Army's requirement to replace the Bell OH-58D Kiowa Warrior.〔 Other military roles are possible,〔 the U.S. Special Operations Command having expressed interest in the S-97 as a replacement for the MH-6 Little Bird,〔〔(S-97 for SOCOM ) - Flightglobal.com, August 16, 2011〕 and the possibility of adapting it for civilian applications also exists.〔
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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