Received PM from aerohead, pasted below:
[EDIT] This is ref. post #63 above. [/EDIT]
Quote:
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Originally Posted by aerohead
Bruce, this is exactly what I would do. The air will be directed along a path which mimics the start of the Kamm roofline, and when it separates it will have some momentum to help it stay on that path, capturing the vortex underneath, then re-attaching before it leaves the new trailing edge. This worked very well on the CRX.
The upper line would be preferred, as there'd be no additional vorticity, but a straight shelf would still 'force' the air to follow a more favorable path, with a small penalty paid to the vortex which would be present above it.
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Now I just need the time to build it (see signature, Oct. 2011) - - - the latest version of the rear spoiler design is currently off the car, stored safely where I can get it immediately.