[1][2][3] The Marathon was designed to comply with the US FAR 103 Ultralight Vehicles two-seat trainer rules and today is marketed as a light-sport aircraft.
It features a parachute-style high-wing, two-seats-in-tandem accommodation, tricycle landing gear and originally a single 50 hp (37 kW) Rotax 503 engine in pusher configuration.
[1][4] The aircraft is built from a combination of bolted dural aluminium and stainless steel tubing.
In flight steering is accomplished via foot pedals, or optionally a control stick, that actuate the canopy brakes, creating roll and yaw.
The aircraft is factory supplied in the form of an assembly kit that requires 30–50 hours to complete.