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They're at the stagnation point. Their function is to divide the air flow between external and internal. The effect on the external flow will be minimal. If there is a difference internally, it will be minimal compared to a grille block.
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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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