[1][2] The Mono-Fly was designed to comply with the US FAR 103 Ultralight Vehicles rules, including the category's maximum empty weight of 254 lb (115 kg).
It features a strut-braced high-wing, a single-seat, open cockpit, tricycle landing gear and a single engine in pusher configuration.
[1][2][3] Early kit-built examples came out with empty weights too high for the FAR Part 103 limit, so the factory stopped supplying kits and produced completed aircraft instead.
These factory-built examples have empty weights under 254 lb (115 kg), even when equipped with a Rotax 503 engine of 50 hp (37 kW).
An Onan 18 hp (13 kW) four stroke industrial engine was also used, although this limited the rate of climb to 400 ft/min (2.0 m/s).