Needs more pictures.
https://external-content.duckduckgo....3d4&ipo=images
The one in the lower left? Are they directional (lefts and rights)?
Nothing beats a full boat tail. Practically, a boxed cavity comes close. The ideal:
The real:
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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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