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Same going forward as backwards, uplift of air in a rolling vortex in each configuration.
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However going forward the vortexes push down on the body (downforce), going backwards uplift is the result.
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Once that is sorted we can get back to how to mitigate the effect. Extrude the pyramidal cap adds 4 vertexes. Beveling the problematic edge makes each vertex four, so adds twelve, but blunts the corners. 4% of the gross width is a good target.
Wait a minute — this is the UN-aerodynamic thread. It's perfect.