 During 1967, Barry Palmer built what is likely the first weight-shift powered trike aircraft.On March 15, 1975, John Moody successfully added a West Bend engine with a 71 cm (28 in) propeller to an UFM Easy Riser biplane hang glider designed by Larry Mauro.Moody opened the throttle and ran until he lifted from the frozen surface of a lake west of Racine, Wisconsin, and he flew for 30 minutes.