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Old 11-09-2011, 08:24 AM   #27 (permalink)
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I don't know what to really make of that last video.

Air with the tail gate all the way up is trapped in a pocket of turbulent flow, which flowing air travels over like a bubble.

Letting the tail gate down half way (45 degrees) releases this trapped pocket of air so that the tufts lay flat, but what of the main flow going over the truck? It is sucked downward, therefore reducing the overall drag?
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