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Centrifical or centripedal force has been used in bathroom fans and vacuum cleaners for ages. Just straight vanes and a collection point. You wouldn't need the collection point.
Unsure about the drag association of vaned rims pumping air from underneath, suspect it's horrendous
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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