 It was powered by a West Bend engine and mounted on top of a Rogallo-type flexible wing hang glider; the propeller was in diameter and was made of balsa wood, covered with fiberglass and mounted in pusher configuration.However, the engine was quite underpowered and the craft could not achieve flight.It is now estimated that a modern flexible Rogallo wing hang glider requires at least at the prop shaft and about 45 lbf (200 N) of thrust just to maintain level flight.