I've got an idea for you. What if we copied the Chapparal 2J/Brabham "fan car" concept instead! Seal off the bottom of the car and mount one of those small Radio Shack fans
(that many use to cool their motors and batteries) on the back of the car facing to the rear so that it sucks the air out from underneath the car, thus creating a perfect vaccume that works at ALL speeds!!! You could couple the fan with a rear diffuser so that you are not only sucking the air out from under, but also creating the venturi effect by accelerating the low pressure air
through the curve of the diffuser. Should work great!!!
