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George A. Spratt
George A. Spratt (1870–1934) was an inventor, aircraft patentee, and the father of George G. Spratt who was also an aircraft designer. Dr. George A. Spratt demonstrated the cable-stayed triangle control frame (TCF) for use in mass-shifting the pilot and pilot holding to control the attitude of a lifting wing for any type of aircraft that could benefit from such arrangement; this arrangement ended up being the sub-assembly most used in these aircraft in the following decades up to contemporary times: hang gliders, powered hang gliders, trikes, and ultralights.〔(Biography, George Spratt )〕
Triangle control frame 〔〔(George Spratt )〕
==References==
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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