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Grumman JF Duck
The Grumman JF "Duck" was a single-engine amphibious biplane, built by Grumman for the United States Navy during the 1930s.
==Design and development==
The Grumman JF Duck was manufactured from 1934 until 1936, when production switched to the J2F Duck and later variants.〔Jordan, Corey C. ("Grumman's Ascendency: Chapter Two." ) ''Planes and Pilots Of World War Two,'' 2000. Retrieved: 22 July 2011.〕 The more obvious external appearance clue to distinguish a JF from an early J2F is the deletion of the inter-aileron strut between the wings on the J2F; less noticeable perhaps is the J2F's slightly longer rear fuselage/float joining fillet beneath the tail.〔
The Duck's main pontoon was part of the fuselage, almost making it a flying boat, though it appears more like a standard aircraft with an added float. This general configuration was shared with the earlier Loening OL. The XJF-1 prototype first flew on 24 April 1933 piloted by Grumman test pilot Paul Hovgard.
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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