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.[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". Archived from the original on January 16, 2007. Retrieved 2007-01-16.CS1 maint: BOT: original-url status unknown (link)
  3. ^ "More on George A. Spratt". Archived from the original on January 17, 2007. Retrieved 2007-01-17.CS1 maint: BOT: original-url status unknown (link)
  4. ^ George Spratt Archived 2008-04-04 at the Wayback Machine