Quote:
Originally Posted by chefdave
Looks bit like a mini kamm back. If set up right and sides filled should work very well.
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The difference being that the leading each is up in the airstream, forcing high speed air down into the car's wake.
I'm far from an aeronautical engineer, but I'm generally under the impression that anything that creates turbulence is going to have an energy toll, and although you're directing air downward into a turbulent low pressure zone, you're using energy to do it. So, the extra energy your inverted airfoil is using may or may not have a positive effect.