C30-C30 S (1937-1938)
Launched in the company's twilight years, the C30 is often seen as not a 'proper' Voisin, mainly because of being equipped with (shock horror!) an American engine.

The truth is, however, every other element of the C30 was personally designed by Gabriel Voisin. Its advanced platform chassis was heavily flocked for acoustic insulation and bore a sober body with well-centred weight distribution and no superfluous decoration.

Excepting the rather heavy-handedly bulbous radiator grille treatment and restricted visibility (on the cabriolet at least), the general concept was entirely consistent with Voisin's long-held principles. And the chassis itself can't have been that mediocre, since it in some respects presaged the Citroen DS.
The engine of course was a different matter altogether. Sleeve valve engines are notoriously expensive to manufacture, and the factory was virtually bankrupt yet again. A 3,560 cc Graham flathead six was therefore decided upon, which at least shared some of the smoothness, flexibility and mechanical silence for which Voisin engines were renowned. Somewhat underpowered for a car of its weight, the normally aspirated unit was later available with a centrifugal supercharger which raised the output to 110 bhp (as opposed to 80 for the standard car).
Two body styles were offered on the C30 chassis: the Frégate factory-bodied saloon and a more fashionable 4-seater Goelette cabriolet built by Dubos. Sales, however, were disappointing, with only 60 C30s built.

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