[1][2] The Questar XLS was designed to comply with the US FAR 103 Ultralight Vehicles rules, including the category's maximum empty weight of 254 lb (115 kg).
[1] The aircraft features a strut-braced high-wing, a single-seat open cockpit without a windshield, fixed tricycle landing gear without wheel pants and a single engine in pusher configuration.
[1] The Questar XLS is made from bolted-together 6061-T6 aluminum tubing, with its flying surfaces covered in doped aircraft fabric.
With full fuel of 5 U.S. gallons (19 L; 4.2 imp gal) the payload for the pilot and baggage is 230 lb (100 kg).
[1] By 1998 the company reported that 70 sets of plans had been sold and that 10 aircraft were completed and flying.