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Originally Posted by richlevy
I saw the vertical eggbeater versions in a demonstration in 1976. The company claimed they were more efficeint than the propeller design, but all I see are the propeller style windmills, so something must be driving the selection.
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IIRC, Popular Science showed a ship designed with several vertical eggbeaters powering the electric motor driven props. 
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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