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A comment on Wind-powered ships are making a comeback. Parent comment

Re:Wind-powered ships are making a comeback by ansible on Sunday October 07, 2018 @07:53PM (#18163265)
Without running the numbers, just looking at the mass of the sail vs. the mass of the ship, is say the effect is neglible.
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Re:Wind-powered ships are making a comeback by marmadukester39 on Sunday October 07, 2018 @08:41PM (#18163410)
I know of a company that makes these as retractable spinning cylinders
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