Thompson expanded his experiment in powering a boxkite with a model airplane engine into full-size reality with twin vinyl-covered aluminum-tube frames and a 55hp snowmobile motor and a prop in 1972. A two-place tandem "flying box-kite” a test flight, reported in his own words, "Great stability. I was 35 feet off the ground before I realized I had taken off!"

 

FAA registration N64492 was issued on 30 March 1973, seen as still valid in mid-2007. Marketed plans for $75.