Gustav Brunner
The D1 was designed by John Gentry and Gustav Brunner. Designed as a wing-car, the D1 utilised an aluminium monocoque and was powered by a Cosworth DFV V8. It was intended to be a replacement for the team's poorly performing HS1 car (a modified Penske PC4 chassis) with which it had started the 1978 Formula One season.