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The Douglas O-38 was an observation airplane used by the United States Army Air Corps. Between 1931 and 1934, Douglas built 156 O-38s for the Air Corps, eight of which were O-38Fs. Some were still in service at the time of the Pearl Harbor Attack in 1941. ==Variants== ;O-38: derivative of the O-25 but with a 525-hp (391-kW) Pratt & Whitney R-1690-3 radial engine and Townend ring cowling; the National Guard received all 44 production aircraft ;O-38A: single unarmed O-38 staff liaison machine for the National Guard ;O-38B: derivative of the O-38 with an R-1690-5 engine; total production was 63, comprising 30 for USAAC observation squadrons and 33 for the National Guard ;O-38C: single aircraft similar to the O-38B for use by US Coast Guard ;O-38E: model with a wider and deeper fuselage on the lines of the private-venture O-38S, with a sliding canopy over the cockpits and a 625-hp (466-kW) R-1690-13 radial engine driving a metal propeller; could be operated on twin Edo floats; the National Guard took delivery of 37 such aircraft ;O-38F: eight unarmed staff liaison aircraft delivered to the National Guard in 1933 with an R-1690-9 engine and a revised, fully enclosed canopy ;O-38P: Almost identical to the E/F series. Six aircraft delivered to Perú in February 1933, fitted with Edo floats; Three took part in the conflict against Colombia, and took part in air combats against Colombian Curtiss F-11C Hawk IIs, one being lost as consequence of damage received during those clashes. Survivors were converted to wheels, and served as trainers until 1940. ;O-38S: private-venture development of the O-38 with a wider and deeper fuselage, crew canopy and a smooth-cowled Wright R-1820-E Cyclone radial engine; in effect was the prototype of the O-38E ;A-6: proposed use of the O-38 as a radio-controlled target drone (cancelled) 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「Douglas O-38」の詳細全文を読む スポンサード リンク
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