I thought a Gurney flap causes the air to wrap around the edge. I may be wrong.
OTOH it may act more like a bug deflector. 
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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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