The Spitfire 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 tractor configuration.
[2][3] The aircraft is made from bolted-together aluminum tubing, with the flying surfaces covered in Dacron sailcloth.
The Spitfire differs from the X1 in having flaps, struts in place of cable-bracing, a centre stick and a cog-belt reduction drive.
[2][3] The design pushes the empty weight limits set by FAR 103 and thus has to be built carefully and cannot be fitted with options if it is to be legally flown in this category.