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Interesting. Could the ring duct be reduced to upturned winglets at the tips similar to what they use on airliners to reduce vortexes forming at the wingtips?
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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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