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RE Streamlined brick and roof carrier.
I have seen the diagram before. It shows a bricks with radius curves on both ends not true bricks. I also recall a quote from Hucho (I think) saying that a 4" radius (or more) was required to keep flow attached. I might assume that the 4" figure would vary depending on the size and speed.
I have found that the main body of air is detached from the roof about a foot back from the windshield on my MK 2 vw Jetta, all front radii on it are tighter than 4". a gradual slope on the front of a carrier might be better than blunt front in my example. Probably a gradual slope on both ends would be best.
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