Possibly Sinclair's most famous product (albeit for quite the wrong reasons), the ill-conceived C5 "electric car" proved to be the point at which Sinclair Research's wheels finally fell off. Attracting controversy and derision in equal measure, the C5 fiasco ended up having a catastrophic effect on Sinclair's finances. Losses of up to £7 million ($12.5 million) eventually forced the company to sell its computer business to Amstrad.
The C5 was promoted by Sinclair as a revolutionary advance in personal transport with the potential to replace the car. The original intention was that it would be only the first in a whole series of electric vehicles - it would have been followed the never-released C10 and C15, each successively bigger and looking more like conventional vehicles. At only £399 ($700), the C5 was a fraction of the price of a conventional car. In fact, it was not a car at all but was instead a glorified electric tricycle, powered by an electric battery with a supplementary pedal drive. It did not inspire confidence that the C5 was assembled and serviced by Hoover, better known for its washing machines, which led to unkind comparisons being made between the two product lines.
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