Maersk is testing a giant spinning cylinder to cut fuel use on cargo ships

Each 115-foot-tall rotor sail could help vessels save hundreds of thousands of dollars a year on fuel costs—and significantly reduce emissions.

[Image: Anemoi/Maersk]

On a cargo ship packed with 8,700 shipping containers, there isn’t much room for anything else. But in a new test aboard one of its vessels, Maersk is making an exception for a giant rotor sail—a spinning cylinder 10 to 12 stories tall that harnesses wind to help reduce fuel use.

The test comes as shipping fuel costs continue to soar. In some areas, the price has risen as........

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