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Old 01-19-2010, 01:26 AM   #2 (permalink)
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The wheel are still "churning" air inside the wheel well -- the Hucho aerodynamic book talks about having close fitting inner fenders to reduce drag of the overall vehicle.

So, with solid covers, the air cannot pass through the wheel, and so the air gets churned less behind the skirt. And the part of the wheel that protrudes below the skirt is also helped.
Sincerely, Neil
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