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Okay,now I'm pretty confused.I was addressing something in the back of a vehicle which would reduce drag,other than a boat tail or box-cavity.And Hucho says that such a thing does not exist.
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Imagine how I must feel.  I think I took the quote in too broad a context.
But... If wings are a [non-spanwise] 2D flow, why is the Prandtl-D so effective? Rudders not 2D?
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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