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All I come up with is flaps ahead of the opening that create a variable bellmouth.
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Like that then. Technically, not speed holes but a semipermeable membrane.
One hinge in the middle of a split flap?
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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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