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Old 08-09-2006, 04:42 PM   #11
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From what I've gathered, any change in angle greater than ~15 degrees will result in seperation and a low pressure area. Underneath the car, the flow is very turbulent, so on a normal car, this flow is more likely to be pulled into the low pressure zone behind the vehicle compared to the relatively smooth flow over and around the vehicle, which is what's creating the pressure drop behind the vehicle. By filling this low pressure zone with air, the greatest change we see should be around the bottom.
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