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Old 09-01-2008, 09:33 PM   #2 (permalink)
mwpiper
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Join Date: Jun 2008
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Tear drop shape works well in free air. Air is not free under car. Creating teardrop shape would produce a venturi that would cause the air to speed up relative to the car. Can't think of the space under a car same as space over it. Think in terms of a more effective duct shape. I.e. minimum surface air for the area of the duct and no sharp edges.
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