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They're flying in loose formation. Agreed that interference drag is as/more important than skin friction, but if the gap is treated as a converging/diverging duct it could be minimal.
Given the lesser frontal area, the competing theories deserve testing.
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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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