Alot more to it than just dimples.... you have to bear in mind velocity and object shape....
A ball has no flat/square edges and air will take the shortest path which is easier on a smooth round object. A car has flat faces and areas of drag, this is part of the reason manufacturers state the Drag Coefficient of a car.
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1986 UR Quattro - (1982) Lombard RAC Group 4 recreation - #24 H.Demuth/J.Daniels
1981 VW mk1 golf GTi - now 5cylinder and RWD.
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