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Old 04-24-2019, 05:51 PM   #11 (permalink)
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One approach is using expanded metal as a pan from body edge inwards to frame. Leave center open.
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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