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Believe me, I agree with most of what you are saying.
First of all though, I'd like to take a picture (and I'll work on this) of the type I'm talking about. I've only seen it on fairly new vehicles. It follows a similar idea to the shape that I'm giving a try.
As far as Abbot, yes I agree that airfoils don't act very similar with a 10% angle of attack difference from a reference. I'd guess though that something this close to the top of a car will not often see that much range.
It is a horizontal "slot", if that is what you are talking about.
Another word about Abbot, and also about NASA and NACA data. Most of that data (and most of which is from the '60s or earlier) was simply obtained by many many many hours of testing and by trial and error.
I simply couldn't find proof of anyone building a structure like this one on the back of a square van. So talk all you want, I'm trying it out. It very likely won't do alot of good, maybe it will need some refining, maybe it will do some good. It cost me very little to prototype, and I'm here to post results on what happens.
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