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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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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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