Flettner rotors sit atop a trimaran boat as it sits in the Riverside Marina in Fort Pierce, Florida. The boat was designed by John Marples for the Save the Planet on Discovery Channel - Shiny Clouds episode. Thrust is created by rotating the two large rotors, forcing air to speed up on one side and slow down on the other. ..Stephen Salter envisages a flotilla of carbon neutral, fully automated boats, similar to this one, sailing the oceans. He believes he has designed such a vessel employing technology first used and then discarded in the 1920?s.
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