Same as with golf ball dimples, they have no effect in most areas. With a golf ball it's at ~115° to the direction of flight.
If I had the time I'd dredge up a link to using serpentine strips.
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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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