sentences:  The S-3D, produced between 1970 and 1997, was a twin-seat, four-wheeled cyclecar, in length, but rather heavy (≈500 kg) due to all-steel body.It was powered by IZH-P3 air-cooled two-stroke engine (18 DIN hp).In the USSR the model was commonly known as a "motor-wheelchair" (, "invalidka") because they were only leased via social care system to disabled people for five years without permission to sell (in a similar way to the British Invacars, made by AC, Thundersley and Tippen).