I know in the Darko wind tunnel they put a metal mesh upstream that affected the attachment through the throat.
![](https://ecomodder.com/forum/member-freebeard-albums-aero+technical-picture8016-100-1191.jpg)
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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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