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wheels
The way I interpret the article,is that the wheel cover itself is responsible for minimizing the vortex of an open stamped steel wheel,and the holes,as Frank has mentioned,is simply a concession to brake cooling,not the cause of the vortex reduction.
In the Sticky on mod-data here at the Aero Forum you''l find some drag data for the GM Firebird Trans Am wheel drag wind tunnel research acquired by GM designer Larry Shinoda.
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