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I think a ground effect is acting as an air dam. But just because the air is going upward, doesn't mean it doesn't take more energy than if there was a wedge shaped nose directing it upward gradually. I think the focus on attachment and smooth vs dirty flow causes people to ignore that it takes energy to move air out of the way.
Yes, of course air will flow around a completely flat nose. It HAS to. But that doesn't mean it's a good idea to design a vehicle that way.
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