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The rounded back edge causes more drag than a sharp lip, which would help to establish a single large vortex instead of general turbulence in the wake. The slight taper in profile is beneficial, but could be increased considerably without causing flow separation, giving a smaller wake.
The 'roo bars on the front must be costing you a significant percentage, too.
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There is no excuse for a land vehicle to weigh more than its average payload.
Last edited by Bicycle Bob; 07-29-2008 at 07:25 PM..
Reason: Addendum
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