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Boeing Vertol YUH-61
The Boeing Vertol YUH-61 (company designation Model 179), was a twin turbine-engined, medium-lift, military assault/utility helicopter. The YUH-61 was the runner-up in the United States Army Utility Tactical Transport Aircraft System (UTTAS) competition in the early 1970s to replace the Bell UH-1 Iroquois helicopter. At the end of the flyoff program, Sikorsky Aircraft was awarded a contract to develop and build its UH-60A entry.
==Development==
Under a contract awarded in August 1972, Boeing Vertol designed and delivered three prototypes to compete UTTAS program.〔Gunston, Bill: ''The Illustrated Encyclopedia of the World's Modern Military Aircraft'', page 205. Crescent Books, New York, NY USA, ca. 1978. ISBN 978-0-517-22477-9〕 When Boeing Vertol failed to win the Army competition, it pinned its hope on winning civil orders and the US Navy's LAMPS III program. In the end, a variant of the Sikorsky design, the SH-60B, won the Navy contract, and the civil orders received were canceled.〔
Three aircraft were built and a further two were cancelled and not completed. An attack helicopter design, using the YUH-61's dynamic system (engines, rotor systems and gearboxes), was proposed for the Advanced Attack Helicopter competition, much as the dynamic system of the earlier UH-1 Iroquois had been adapted into the AH-1 Cobra gunship, but did not make the downselect that resulted in the Bell YAH-63 and Hughes YAH-64 being built. The Boeing Vertol AAH design was unique in that the crew were seated in a laterally staggered tandem configuration.〔http://www.helis.com/h/bo_aah.jpg ''helis.com,'' Retrieved: June 14, 2011.〕
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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