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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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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