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The Return of Sail Power: Cargo Ships Are Turning Back to the Wind

193 points · 136 comments · gumby

  1. WalterBright · · focus · HN ↗
    This seems to happen once every 20 years.
    1. TeMPOraL · · focus · HN ↗
      You mean once every 20 months. I've seen this article several times already. I first learned about Flettners from one - fascinating devices, btw. - which is why I notice when it resurfaces again, every year or two.
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