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One approach is using expanded metal as a pan from body edge inwards to frame. Leave center open.
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Expanded metal as in grating? I have this theory that semipermeable panels would guide the underbody air mass while allowing the pressure above the panel to equalize at lower velocity. Sort of a Fresnel effect for molecules. But I'd go with perforated rather than expanded.
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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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