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Bell YAH-63
The Bell Model 409/YAH-63 was an experimental attack helicopter for the Advanced Attack Helicopter (AAH) competition. Hughes' ''Model 77/YAH-64'', later developed into the AH-64 Apache, was selected over Bell's entry.
==Design and development==
During the mid-1960s, United States Army initiated the Advanced Aerial Fire Support System (AAFSS) program to develop the Lockheed AH-56 Cheyenne for the anti-tank gunship role. The U.S. Army pursued the AH-1G HueyCobra as an interim type for the "jungle fighting" role. However the Army's broader concern was the task of protecting Western Europe from the legions of Warsaw Pact armor to the east.〔Greg Goebel. (First Generation Cobras ). Vectorsite, 1 December 2008.〕
In 1972, the Army conducted an evaluation between the Bell 309 KingCobra, the Lockheed Cheyenne, and the Sikorsky S-67 in a competitive fly-off. The fly-off began in the spring of 1972 and was completed in July. In August, somewhat to everyone's shock, the Army rejected all three competitors.〔Greg Goebel. (Model 309 Kingcobra / Model 409 AAH (YAH-63) ). Vectorsite, 1 December 2008.〕
Difficulties delayed the AH-56 Cheyenne development. The Army canceled the Cheyenne program in August 1972. Controversy over the Cheyenne's role in combat and the political climate regarding military acquisition programs caused the Army to amend the service's attack helicopter requirements in favor of a simpler and more survivable conventional helicopter.〔Robb, Raymond L. ("Hybrid helicopters: Compounding the quest for speed" ). ''Vertiflite''. Summer 2006. American Helicopter Society.〕〔
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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