Flettner rotor sail technology was invented more than 100 years ago. Modern need for fuel efficiency is bringing it back.
13
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Wind propulsion now a force to be reckoned with in transport
9 votes -
‘Dolphin skin’ propeller boosts fuel efficiency of cargo ships
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Japan's mini kei truck sales surge in US despite safety concerns
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Car safety and fuel efficiency improvements aren't driving up the cost of cars
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