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Boeing XF6B
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The Boeing XF6B-1 / XBFB-1 was Boeing's last biplane design for the United States Navy. Only the one prototype, ''Model 236'', was ever built; although first flying in early 1933, it rammed into a crash barrier in 1936 and the design was not pursued further.
==Design and development==
Ordered by the U.S. Navy on 30 June 1931, the fighter aircraft was a derivative of the Boeing F4B; it was almost entirely of metal construction, with only the wings still fabric-covered. The aircraft was powered by a 625 hp Pratt & Whitney R-1535-44 Twin Wasp engine.〔
The intended role of this design turned out to be uncertain. While its rugged construction was capable of withstanding high ''g''-forces, it weighed in at 3,704 pounds (700 pounds more than the F4B), and did not have the maneuverability needed in a fighter aircraft. It was, however, suitable as a fighter-bomber, and in March 1934 the prototype was redesignated XBFB-1 in recognition of its qualities. Even so, various ideas were tried to improve its fighter qualifications, such as an improved engine cowling, streamlining around the landing gear, and even a three-bladed propeller (two-bladed props being standard).〔
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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