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).