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inward
If the roof inclination is too 'fast' the downwash will be held down the center by a macro version of the effect created by VGs,except the vortices are large and can contribute significantly to drag.
The tufts are pointing into a lower pressure/faster flow.
If the contour is like the 'Template',all the tufts will blow straight back,vortice free.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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