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Those are good thoughts. It would be useful to have access to testing data on how the air does flow under a car. I cannot imagine. My car has deep cross members that stick down. Does static air just hang up there or does it flow up into and out of those spaces?
There are several types of vortex generators. The most common ones are showing up just above the rear window on the roofs of most BMW sedans. I will do a search and find others and post them. Somehow or other they make the air flow more smoothly down the rear window without creating eddies and separation.
Sam
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