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It reminds me of the deflectors we used to see on station wagons and SUVs that directed air down across the back window to try to keep it from getting so dusty. Those are known to increase drag...
Their image purporting to show the "before and after" flow shows, as expected, the same size trailing wake area on the trailer; while they claim the length of the turbulent zone that trails behind is halved. I'm not sure what to make of that; color me skeptical hippo too.
Last edited by Frank Lee; 11-06-2011 at 08:28 PM..
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