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But what about the aero penalty?
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What about it? It needs A-B-A testing.
Of course it only works with approx. vertical windshields. The Beetles max camber is at the B-pillar so it's in a positive pressure gradient. It's a wing not a pocket.
With a properly sized and located gap, you'd have a Coanda nozzle/air curtain; it might improve the aero.