Quote:
Originally Posted by NeilBlanchard
Right, and vacuuming it off has the effect of lowering the air pressure under the front of the car. Combining the vacuum slot and the moving belt, this could artificially give downforce on the front of the car.
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I was just thinking about this more--over the stationary floor, the velocity at the floor/boundary layer interface is 0, so all the kinetic energy of the airstream there is being converted to pressure. That could make the pressure under the front of the car overly positive if not corrected, and suctioning it off could address that.