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North American XB-28 Dragon
The North American XB-28 (NA-63) Dragon was an aircraft proposed by the North American Aviation to fill a strong need in the United States Army Air Corps for a high-altitude medium bomber. It never entered into full production, with only two prototypes being built.
==Design and development==
The order for a high-altitude medium bomber was put out on 13 February 1940; the XB-28 first flew on 26 April 1942. The XB-28 was based on North American Aviation's highly successful B-25 Mitchell, but as it evolved it became a completely new design, much more reminiscent of the Martin B-26 Marauder. The overall configuration of the B-25 and XB-28 were fairly similar; the most important distinction was that the twin tail of the B-25 was changed to a single tail on the XB-28. It was among the first combat aircraft with a pressurized cabin.
The XB-28 proved an excellent design, with significantly better performance than the B-25, but it was never put into production. High-altitude bombing was hampered significantly by factors such as clouds and wind, which were frequent occurrences in the Pacific. At the same time, medium bombers were becoming much more able at lower altitudes. The gains in aircraft performance that came with high-altitude flight were not significant enough to justify switching from low-altitude bombing.
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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