The idea of the Flettner rotor was first devised by Finnish inventor and architect Sigurd Savonius within the 1920s, concurrently with German aviation engineer Anton Flettner. The idea was based mostly on the Magnus impact.
The Magnus impact is an observable phenomenon that’s generally related to a spinning object shifting by air or one other fluid. The path of the spinning object is deflected in a fashion that isn’t current when the article will not be spinning. The deflection will be defined by the distinction in stress of the fluid on reverse sides of the spinning object. The Magnus Effect depends upon the pace of rotation.
The German physicist Heinrich Gustav Magnus described the impact in 1852.
On the early 1920’s Flettner put in two vertical cylinders 15 meters excessive and a couple of.75 meters in diameter on a 52 m dismasted sailboat, the Buckau. The cylinders have been pushed in rotation by a small engine. The expertise was conclusive because the ship moved quicker than earlier than underneath sail. In 1926, Flettner launched into the Hamburg-New York crossing by way of The Canaries, together with his then renamed Baden-Baden. Left on April 2, he arrived on May 9.
The rotating sails supplied a internet vitality acquire, however earlier than they might be extensively adopted the Great Depression struck, adopted by World War II. The Flettner rotor could be deserted for nearly a century in favor of burning fossil gas.
The Hamburg Amerika Line then positioned an order for ten rotor ships. But just one copy was constructed. 92 m lengthy and outfitted with three rotors. The Barbara was positioned on the Hamburg-Italy line, carrying three,000 tonnes of products. After six years of use, the cylinders have been dismantled and the ship, fitted with typical propulsion.
In 1980, the Japanese launched the small tanker Shin Aitoku Maru. It has two masts carrying a inflexible sail, adjustable and hydraulically orientable. The system seemed promising and it was a plan to equip17 different vessels.
The small British bulk service Ashington was fitted in 1988 with an auxiliary propulsion system, a inflexible wing mounted on a turntable on the prime of its chimney. The total look, ugly, was computer-controlled and saved 10% when it comes to the maintain.
Almost 100 years after the unique mission of Anton Flettner, the Finish entrepreneur Tuomas Riski began to seek for a brand new potential cleantech idea. He occurred to satisfy the well-known naval architect, Professor, Dr. H.C Kai Levander from Finland, who had an concept of bringing a modernized Flettner rotor to the market. From this union of well-known rules and new innovation, Rotor Sail expertise was born. The firm Norsepower was based in late 2012 with headquarters in Helsinki, Finland.
Norsepower Rotor Sails are modernized variations of Flettner rotors based mostly on the Magnus impact. The authentic primary engineering resolution had a restricted diploma of sophistication, however Norsepower has created numerous new enhancements for which a number of patents have been granted. The Norsepower Rotor Sail expertise is round ten occasions extra environment friendly than a standard sail, as a result of extra carry is produced with a a lot smaller sail space. Due to its simplicity, it requires no reefing or crew consideration when in operation. It is “push-button wind propulsion” from the bridge.
Tuomas Riski, CEO and accomplice of Norsepower, stated: “Our imaginative and prescient is to set the usual in bringing sails again to ocean transportation, and empower delivery in direction of reaching the objective of zero carbon emission. Our complete staff is strongly motivated by our mission to scale back the environmental affect of delivery with our Rotor Sails.”
Today the tanker Maersk Pelican, the ferry Viking Grace, the MV Estraden and MV Copenhagen are outfitted with Norsepower rotol sails. The SC Connector would be the subsequent to make use of the Norsepower expertise.
London based mostly, Anemoi Marine applied sciences can be creating rotor sails. In November 2020, the corporate signed a joint growth mission with…

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