Without running the numbers, just looking at the mass of the sail vs. the mass o... | Hacker News

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		ansible on Oct 7, 2018 \| parent \| context \| favorite \| on: Wind-powered ships are making a comeback Without running the numbers, just looking at the mass of the sail vs. the mass of the ship, is say the effect is neglible.

marmadukester39 on Oct 8, 2018 [–]

I know of a company that makes these as retractable spinning cylinders

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