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Stan - I know there are rarely simple answers in aerodynamics, but can you say whether skirts in racing are primarily meant to reduce overall drag, or are they there to retain a pressure differential between ambient, and the lower pressure underneath the vehicle (for more downforce)?
I haven't seen much written about skirt use on road cars, specifically for drag reduction - except a suggestion that in a crosswind situation, skirts will increase projected area in the "apparent" direction of travel through the wind.
Darin
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