been flown on many long flights. John D. (Jack) Peterson, Jr. completed a flight in a Pfledge from Long Beach, California to Hilton Head, South Carolina over a period of 29 days between July 9 and August 6, 1979, with ground support. He flew the distance by flying distances of a maximum of 120 miles (194 km) in a single flight. This feat was the first time that an ultralight airplane had been flown across the US from coast to coast. Peterson's aircraft is on display in the Smithsonian Museum's Steven F. Udvar-Hazy Center. McCornack and Nicely's 1979 flight from Monterey, California, to Oshkosh, Wisconsin, and on to the Atlantic coast was the second transcontinental flight by this aircraft type and was done mostly without ground support. Variants Pfledge The first Pfledges (also referred to as Fledges, and Fledglings) were tailless flying wings powered by a two-stroke Xenoah engine driving a 36-inch propeller. Some were also powered by a 136 cc Chrysler two stroke engine. Pfledge X The Pfledge X featured a Xenoah 242 powerplant that produced . Pfledge OR The "Oshkosh Replica" was the production version of the two aircraft that were flown coast to coast in 1979. It was powered by a German Sachs SA-340 direct drive engine with a 336 cc displacement. This model sold for USD$2,850 in 1980. Pfledge 430D The Pfledge 430D was announced late in 1979. This model featured a Cuyuna 430D engine which McCornack helped design. The engine was a two cylinder, two stroke engine with a displacement of 429 cc and a power output of . It weighed . The "D" indicated that the engine was direct drive and not connected to the propeller through a reduction drive system. The Pfledge 430D also replaced the twist grips with a conventional stick for roll control, originally developed by Paul Yarnell, while pitch remained via weight shift. The Pfledge 430D cost USD$3600 in 1980. NFL Before the introduction of its FAR 103 ultralight regulations in 1982 the FAA did not regulate ultralights as long as they were foot-launchable. The demand from conventional aircraft pilots for a version of the Pfledge that had aerodynamic pitch control instead of weight-shift led McCornack to add an elevator to the back of the aircraft, mounted on twin booms behind the pusher propeller. Because this design was "Not Foot Launchable" it was called the NFL (pronounced "Niffle"). The design