|
The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined, experimental high-speed compound helicopter under development by Piasecki Aircraft. The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk, but utilizes Piasecki's proprietary vectored thrust ducted propeller (VTDP) design and includes the addition of lifting wings. The concept of the experimental program is to apply the VTDP technology to a production military helicopter to determine any benefit gained through increases in performance or useful load. "SpeedHawk" is a concept aircraft〔(.aviationtoday.com )〕 based on applying X-49A compounding concepts to a production UH-60 Black Hawk offering better performance, range, and increases in useful load. The "SpeedHawk" aircraft includes an SPU (third engine), high forward-swept wing concept, a 45-inch "fuselage plug" cabin extension, and several other drag reducing and performance-oriented improvements, including a rotor hub fairing, landing gear streamlining, and a fly-by-wire flight control system. ==Development== The U.S. Navy-sponsored project worth US$26.1 million consists of a Sikorsky YSH-60F helicopter modified by Piasecki as a testbed to validate the "Vectored Thrust Ducted Propeller" (VTDP) system. One YSH-60F was converted to test the feasibility of VTDP under an advanced technology demonstration program. The YSH-60F is powered by two General Electric T700-GE-701C engines. The demonstration contract was awarded on by the Naval Air Systems Command to Piasecki Aircraft. Piasecki installed a lifting wing with flaperons and a vectored-thrust ducted propeller (VTDP) to a U.S. Navy Sikorsky YSH-60F.〔("Piasecki X-49 SpeedHawk (United States)" ), ''Jane's Helicopter Markets and Systems''. Jane's Information Group, 9 May 2008.〕 The compound helicopter technology added to the YSH-60F was first demonstrated in trials of the Piasecki 16H-1 and 16H-1A in the early 1960s, when the helicopters were flown at speeds up to 225 mph (360 km/h). The success of the Pathfinder inspired others to experiment with compounding, resulting in programs such as the AH-56 Cheyenne. In May 2003, the YSH-60F/VTDP demonstrator was redesignated the ''X-49A.〔(DOD 4120.15-L - Addendum ), Designation-Systems.Net, 8 July 2008.〕 During 2004, the X-49A VTDP program was transitioned from the U.S. Navy to the U.S. Army. Piasecki planned to use the vectored-thrust ducted propeller design of the X-49 for their entry in the Future Vertical Lift program,〔(The Other JMR/FVL Contenders ) - Aviationweek.com, April 12, 2013〕 but were not chosen to take part in the Joint Multi-Role Technology Demonstrator (JMR-TD) phase.〔(AVX joins Bell, Sikorsky/Boeing for Army's JMR-TD development ) - Flightglobal.com, 6 June 2013〕 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「Piasecki X-49」の詳細全文を読む スポンサード リンク
|