George A. Spratt

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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.[1]

Dr. George A. Spratt towed his hang glider on floats using a motorboat demonstrating cable-stayed triangle control frame (TCF) or A-frame for use in pilot-pendulumed weight-shift control of hang gliders, trikes, ultralights.United States, 1929.[2][3]

Triangle control frame [1][4]


  1. ^ a b Biography, George Spratt
  2. ^ Early Spratt Aircraft at the Wayback Machine (archived January 16, 2007)
  3. ^ More on George A. Spratt at the Wayback Machine (archived January 17, 2007)
  4. ^ George Spratt