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Stearman XA-21
The Stearman Model X-100 was a competitor in an United States Army Air Corps competition for a twin-engined attack aircraft which (after redesigns) led to the Douglas A-20 Havoc, Martin A-22 Maryland and North American B-25 Mitchell.
==Design and development==
The X-100, designated XA-21 following purchase by the Army Air Corps, was a twin-engined high-winged monoplane of all-metal construction.〔("Stearman XA-21 (Stepped Cockpit)." ) ''Museum of the United States Air Force''. Retrieved: 16 February 2011.〕 It featured an unusual cockpit arrangement, much like those on most German World War II bombers designed during the war years, with a streamlined greenhouse canopy enclosing both the pilot and bombardier stations.〔Bowers 1989, p. 273.〕
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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