The aircraft was designed to comply with the US FAR Part 103 Ultralight Vehicles rules as well as the German 120 kg class (called the Solo 120) and deregulated 115 kg class in the United Kingdom. It features a strut-braced high wing, a single-seat open cockpit, tricycle landing gear and a single engine in tractor configuration. The aircraft is built with a composite fuselage and an aluminum wing. Its 8.97 m (29.4 ft) span wing has flaperons and employs a single strut on each side supported by an optional jury strut. The standard engines used when the type was introduced were the 28 hp (21 kW) Hirth F33 and the 50 hp (37 kW) Hirth F23 two-stroke powerplants. The design offers combinations of three types of wings, three types of engines and four types of wheels. Starting in 2015 the company began using engines from Polini of Italy. The DAR Solo UL and on DAR Solo UL 120 were fitted with the two stroke, liquid-cooled 36.5 hp (27 kW) Polini Thor 250 DS. DAR Solo UL receive its type certificate from German DULV in 15 November 2015.[circular reference] The DAR Solo 120 received its DULV type certificate in 22 December 2017. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.
