If it were a more-or-less straight cylinder with an annular wickerbill, or Gurney flap, just abaft the edge of the mirror (Coanda nozzle) it would pull air 'around the corner' and reduce the wake size.
Or not.
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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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