The development programme moved to the University of Exeter in 1982, where the C1 chassis was fitted with fibreglass shells and tested in a wind tunnel. It was recognised at an early stage that the vehicle would have to be aerodynamic; although it was only ever intended to be small and relatively slow, reducing wind resistance was seen as essential for the vehicle's efficiency.[1] By March 1982, the basic design of the C1 had been established.[2] Sinclair then turned to an established motor design company, Ogle Design of Letchworth, to provide professional styling assistance and production engineering.