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12%
I read everybody's post.It could be,that this grille performed at a 12% drag reduction only on this experimental Ford Capri.In my earlier post,before I got the image online,I mentioned that the production cars which used this "style" of grille,did not realize drag reductions of a scale even remotely close as to that of the experimental car.I can't explain the grilles behavior.It's the only article I've seen which addresses the original inquiry about a self-regulating passive device.All I can intuit,is that these airfoil sections experience a turbulent boundary layer buildup as the car exceeds about 20-mph,and the vorticity associated with this region inhibits passage of air from the stagnation point,spilling over and around the grille.
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