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.

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.

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