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louvers
The louvers themselves will be high-drag, suffering the vena-contracta entry losses.
I'd stay with Walter Korff's frontal stagnation point, single, bell-mouthed opening.
https://ecomodder.com/forum/member-a...speed-aero.jpg
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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