Sky Sail and Helicopter in 'Near Miss': A Danger to Aircraft?![]() Science & Tech Daphna - 62 days ago - treehugger.com It's been a while since we heard about Sky Sails kite propulsion system, which was promising that its retrofitted system could save anywhere between 20-40% on fuel costs on your average ship. (You can check out video of Sky Sails in action too.) While pro
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