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Thanks Donkey! I've never seen one up close, but it looks to me like Mr. Brock used a simple formed sheet of acrylic. If so, one would want the exit area to be a somewhat less than the inlet area, so that the flow inside of the vane would accelerate and have the energy to promote attached flow along the side of the green house. If you had too much inlet area, the flow outside the vane would detach and you might add drag. I think an airfoil shape with as much camber as the windshield to side window angle would be better, or at least forming the sheet into a 180 degree radius at the inlet would be better. That would give the stagnation line some flexibility as to where it lies. A fore and aft, and in and out adjustment could be used to tune the installation, along with some tuft testing.
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