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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 North American XB-21 ： ウィキペディア英語版 North American XB-21 The North American XB-21, also known by the manufacturer's model designation NA-21, and sometimes referred to by the name "Dragon",〔Jones 1962, p. 65.〕 was a prototype bomber aircraft developed by North American Aviation in the late 1930s, for evaluation by the United States Army Air Corps. Evaluated against the Douglas B-18 Bolo, it was found to be considerably more expensive than the rival aircraft, and despite the ordering of a small number of evaluation aircraft, only the prototype was ever built. ==Design and development== North American Aviation's first twin-engined military aircraft,〔Yenne 2005, pp. 64–65.〕 the NA-21 prototype was constructed at North American's factory in Inglewood, California,〔Donald 1997, p. 696.〕 where work on the aircraft began in early 1936.〔Baugher, Joe. ("North American XB-21." ) ''American Military Aircraft,'' 1 August 1999. Retrieved: 29 July 2011.〕 The NA-21 was a mid-wing monoplane of all-metal construction, powered by two Pratt & Whitney R-2180-A Twin Hornet radial engines,〔 which were fitted with turbosuperchargers for increased high-altitude performance.〔 Flown by a crew of six to eight men,〔 the XB-21 featured a remarkably strong defensive armament for the time,〔 including as many as five .30-calibre M1919 machine guns.〔("Factsheets: North American XB-21." ) ''National Museum of the United States Air Force''. Retrieved: 21 May 2010.〕 These were planned to be fitted in hydraulically powered〔Reuter 2000, p. 38.〕 nose and dorsal turrets, in addition to manually operated weapons installed in waist and ventral positions.〔 Up to of bombs could be carried in an internal bomb bay, with of bombs being able to be carried over a range of .〔 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「North American XB-21」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.