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Old 11-07-2011, 09:10 PM   #3 (permalink)
NeilBlanchard
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You cannot slope the underside up as steeply as you slope the top and the sides. The reason is, the ground slows the air flow back in, and so you would create a low pressure wake. The underside has to be kept flatter so this doesn't happen.

Here's the template that includes the curve on the underside:

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Last edited by NeilBlanchard; 11-07-2011 at 09:17 PM..
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