Home-built flying wing originally designed as foot-launched hang glider. Initially classified as ultra-light, evolved into experimental home- built as power, enclosed cockpit, landing gear, and etc., added. Airframe consists of wood, foam, fiberglass, and 4130 steel tube around the cockpit. Covered with Ceconite 7600 and weighs 335 pounds, including a70-lb engine. Donors report that airplane handled well except on landing when lack of low- speed control and inadequate control harmonics (elevator sensitive, aileron and tip drag rudders ineffective 30 mph flare speed) caused hard, off-course landings on several flights. Total flight time 7 hr 50 min.