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The Martin XB-16, company designation Model 145, was a projected heavy bomber designed in the United States (US) during the 1930s. ==Design and development== The XB-16 was designed to meet the United States Army Air Corps (USAAC) request for a bomber that could carry of bombs . The XB-16 (Model 145A) was to use four Allison V-1710 liquid-cooled inline engines; contemporary American aircraft used air-cooled radial engines. In 1935, Martin revised the XB-16 design as the Model 145B. The wingspan was increased from to , and a set of V-1710 engines added to the trailing edge. This version had a wingspan 20% greater than that of the B-29 Superfortress, the first operational bomber that would fill the role intended for the XB-16. The XB-16 was cancelled for essentially the same reason the B-15 project was: it wasn't fast enough to meet the requirements set by the Army. Since both were cancelled around the same time, Martin did not have time to produce an XB-16. 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「Martin XB-16」の詳細全文を読む スポンサード リンク
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