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Eroding clay method
Looking at the closeup photos, something came to mind.
It appears that the clay introduces an artificial roughness which by itself would alter Reynolds number, directly effecting the point of separation, as with VGs.
Not only the performance of the wing ( turning vane), but also any of the Insight's body covered or behind it.
Technically, this would have to be sorted out.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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