[1][2][3] The earliest Rallys were derived from hang gliders and comply with the US FAR 103 Ultralight Vehicles rules, including the category's maximum empty weight of 254 lb (115 kg).

The series all feature a cable-braced high-wing, a single-seat, open cockpit, conventional landing gear and a single engine in pusher configuration.

The series was highly successful due to its low price and solid engineering.

[1][2] The aircraft is made from aluminum tubing, with the flying surfaces covered in Dacron sailcloth.

[1][2] The first Rallys were simple powered hang gliders and grew in sophistication as the model numbers increased.