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Old 04-28-2015, 07:57 PM   #2 (permalink)
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If you have a complete and well executed belly on the car,the region aft of the rear axle can be made to form a diffuser of 2.5-degrees,to 4-degrees up-slope,depending on where the origin of the diffuser begins.
2.5-degrees is preferred for low drag.But you need to honor ramp and departure angles which can create a ground strike on driveway ramps,etc..
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