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As far as vortexes go, my reading is that the square edges is where they are created, so image 3 would be the worst for that.
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Mine is that vortexes are caused by a pressure imbalance between the top and sides causing air to move up instead of back, so a square section wouldn't shed vortexes. The middle shape is based on a superellipse—half-way between a circle and a square. I see it as reasonable stand-in for the vehicle actual cross section with some height/width adjustment.
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Definately want some answers on the contradictions of top taper, side taper and the 22*rule.
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Here's two answers
•Boxfish
•Tromphenwagen
