The wind tunnel testing was carried out in the University of Auckland’s Twisted Flow
Wind Tunnel, with the twisting vanes removed, and the walls contoured into a contraction to
form an open jet of size 3.5 x 3.5 m2. In addition, a moving belt 1.6m wide and 3m long
driven by an electric motor was used to provide the correct boundary condition at the ground
by being driven at the same speed as the onset air flow. A half-scale model made of carbon
fibre was used for the testing. It was attached to the under-floor wind tunnel balance. The car
wheels were not attached to the car model, but were positioned accurately and spun by the
belt action. A photograph of the model mounted above the belt is given in Fig. (2). The flow
quality above the belt was examined by performing many velocity profiles. There is not
space in this abstract to include those profiles