SDB was an enterprise of the Moscow State Technical University of Civil Aviation. The SDB website has been removed from the internet and the enterprise seems to have gone out of business, ending production of the Karat.[2]
The Karat is a nanotrike that was designed to comply with the US FAR 103 Ultralight Vehicles rules, including the category's maximum empty weight of 2540NaN0. The aircraft has a standard empty weight of 2010NaN0. It features a cable-braced hang glider-style high-wing, weight-shift controls, a single-seat open cockpit without a cockpit fairing, tricycle landing gear and a single engine in pusher configuration.
The aircraft is made from bolted-together aluminum tubing, with its single or double surface wing covered in Dacron sailcloth. It was designed to be light enough to accept any hang glider wing with a high enough gross weight. A typical wing used would have a 9.81NaN1 span, be supported by a single tube-type kingpost and use an "A" frame weight-shift control bar. The standard powerplant is a single cylinder, air-cooled, two-stroke, 280NaN0 Hirth F33 engine. The aircraft has an empty weight of 910NaN0 and a gross weight of 2200NaN0, giving a useful load of 1290NaN0. With full fuel of the payload is 1070NaN0.
When it was available the trike was sold as a fuselage frame and engine, with the customer providing the hang glider wing.
