Anemoi Marine Technologies Ltd (“Anemoi”), a leader in wind-assisted propulsion systems, was awarded a Type Approval Design Certificate from classification society DNV for its Rotor Sail design measuring 5 meters in diameter and 35 meters in height.
“We are delighted to have received this important Type Approval from DNV, which is a testament to the rigorous design and engineering work undertaken by our team,” said Kim Diederichsen, CEO of Anemoi. “This certification provides shipowners and operators with the assurance they need to invest in our 5x35m Rotor Sail solution, which has already been selected for upcoming installations on several vessels.”
Rotor Sails, also referred to as “Flettner Rotors,” are vertical cylinders that, when driven to rotate, harness the renewable power of the wind to propel ships. These mechanical sails capitalize on the aerodynamic phenomenon known as the Magnus Effect to provide additional thrust to vessels. By leveraging wind energy, Berge Neblina will see increased efficiency by reducing the power required from the main engine while maintaining speed, therefore substantially reducing fuel consumption and resulting in less greenhouse gas emissions.
The type approval design certificate (TADC) was retrospectively presented to Anemoi during a special ceremony at SMM in Hamburg, Germany, September 5. The certificate validates that Anemoi’s 5x35m Rotor Sail design complies with DNV’s technical standard (ST-0511) for wind assisted propulsion systems (WAPS).
“We are very pleased to build on the excellent collaboration with Anemoi with the presentation of this certificate,” said Hasso Hoffmeister, Senior Principal Engineer at DNV Maritime. “Together we are continuing to develop the technical standards and class notations that will enable the momentum behind WAPS to continue to build and enhance shipping’s drive to greater sustainability.”
The technology is being increasingly embraced by ship owners, primarily in the bulker and tanker sectors, who are aiming to achieve net-zero shipping emissions. Rotor sails have emerged as a preferred technology to augment and enhance the energy performance of vessels. Rotor sails are a compact technology, which offer a large thrust force to propel ships with minimal impact on visibility, stability, and port operations, helping them comply with pivotal international emission reduction benchmarks such as the Carbon Intensity Indicator (CII) and EEDI/EEXI.
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