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Neat News 2021-57 (added 2021-02-26)

Better propellers to reduce noise

ocean.jpg

The noise produced by ships can harm sea animals. As a study of a propeller upgrade of five ships found, the noise can be reduced by 75 percent (or 6 to 8 decibels).

related: #propeller #noise_reduction

News seen at: Scientific American - Sustainability

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