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- Rotor sail helps Finnish ferry Viking Grace reduce fuel consumption | Metropolitan.fi https://metropolitan.fi/entry/rotor-sail-helps-finnish-ferry-viking-grace-reduce-fuel-consumption 68 comments
- 'Spinning sail' rebooted to cut fuel and make ocean tankers greener | Renewable energy | The Guardian https://www.theguardian.com/environment/2017/mar/14/spinning-sail-reboot-cut-fuel-make-ocean-tankers-greener 17 comments
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