1443Roof and side panel cambering

(Figs 14.29(a and b) and 14.30(a and b)) Cambering the roof (see Fig. 14.29(a and b)) and the side panels (see Fig. 14.30(a and b)) reduces the drag coefficient. However, if the roof camber curvature becomes excessive the drag coefficient commences to rise again (see Fig. 14.29(b)), whereas the reduction in drag coefficient with small amounts of side-panel cambering is marked (see Fig. 14.30(b)), but with excessive camber the reduction in the drag coefficient becomes only marginal. Both roof and side panel camber should not be increased at the expense of enlarging the frontal area of the car as this would in itself be counter-productive and would increase the drag coefficient.

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