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A comment on A cargo ship's 'WindWing' sails saved it up to 12 tons of fuel per day. Parent comment
There appears to be at least one company working on this: https://www.cnn.com/2023/06/30/travel/airseas-giant-kites-sh...
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There appears to be at least one company working on this: https://www.cnn.com/2023/06/30/travel/airseas-giant-kites-sh...