1) There is a two-view on the linked website but it won't copy.
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Separating the battery would eliminate the portability of the unit.
A toroidal propeller would be more efficient.
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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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