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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bell H-12 ： ウィキペディア英語版 Bell H-12 The Bell R-12 (Model 48), re-designated as the Bell H-12, was an American 1940s military utility helicopter built by Bell Helicopter company.〔Pelletier 1992, p. 91.〕 ==Design and development== During 1946, Bell Helicopter began development of a new utility helicopter, the Model 42, much larger than the Model 47, utilized a scaled-up version of the Model 47's rotor system. Three prototypes were built but serious rotor problems and complexity of mechanical systems precluded production. The initial Model 42 variant was civilian, but the United States Air Force ordered the development of its military variant, the Model 48, of which, two prototypes were ordered as the XR-12, powered by a single Pratt & Whitney R-1340-AN-1 radial engine and featuring seating for five. Of very similar construction to the Model 42 the Model 48 had a shorter rotor mast. A production batch of 34 helicopters was ordered, under the designation R-12A, but cancelled in 1947.〔 Another enlarged prototype (the XR-12B, Model 48A) with seats for eight plus two pilots and a more powerful Pratt & Whitney R-1340-55 engine was also ordered, followed by 10 pre-series YR-12B helicopters, with a glazed nose, instead of the car-like nose of the Model 42 and XR-12. While under flight test the helicopter was re-designated the H-12, but the results were not satisfactory, there were major problems with the main rotor due to blade weaving and poor rotor governor performance.〔 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「Bell H-12」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.