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Originally Posted by Gerrelt
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Or go to my site and go to Aerodynamics -> Aero Wool Tuft Testing.
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From page 3:
Without spoiler - Page 3
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Look at the top tufts, they follow the shape of the rear window rubber. They are pressed against it, forcing it to follow the shape.
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This is not at all what I expected. The wind tunnel smoke images I posted off of your site show the air leaving the surface at the top of the window trim. Air at the middle of the window without the roof spoiler is still attached to at least the middle of the rear window.
100 kph is equal to 62 mph, a more common highway speed in the USA is 72 mph (at least for me). Would the extra 10 mph dramatically alter the tuft results?
EDIT: at the beginning of "
vw beetle wool tuft test 2" video, the tufts in the middle of the window seem to wiggle a bit, but are still flat against the glass.
Gerrelt, what level of turbulence if any is this considered?