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Interesting discussion - I would think the slot just ahead of the moving "roadway" belt would be supplying air to make the relative motion of the roadway and the boundary layer of air be stationary relative to each other.
With the "extra" air flow introduced at the front of the belt - the belt's motion would possible accelerated the already moving air. By the way, what affect would the texture of the belt / roadway have on things?
By vacuuming some air away from in front of the belt would seem to INCREASE the motion of the air relative to the moving belt, and thereby make the effect of the moving belt, and therefore lowering air pressure under the car - which makes it LESS "realistic"; not more.
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