Inspired by Jim Hall, Chapman was among those who helped introduce aerodynamics into Formula One car design. Lotus used the concept of positive aerodynamic downforce, through the addition of wings, at a Tasman Formula race in early 1968, although Ferrari and Brabham were the first to use them in a Formula One race at the 1968 Belgian Grand Prix. Early versions, in 1968 and 1969, were mounted or so above the car, to operate in 'clean air' (air that would not otherwise be disturbed by the passage of the car). The underdesigned wings and struts failed regularly, however, compelling the FIA to require the wing mounting hardware to be attached directly to the sprung chassis. Chapman also originated the movement of radiators away from the front of the car to the sides, to decrease frontal area (lowering aerodynamic drag) and centralising weight distribution. These concepts remain features of virtually all high performance racing cars today.