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020 3727 6900


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[email protected]


Head office:
Anemoi Marine Technologies Limited
6th Floor Marlow House
1A Lloyds Avenue, London
EC3N 3AA, United Kingdom

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Fuel & Emission Savings:
If you’d like us to carry out a fuel and emission saving assessment on your vessel/fleet, please complete and submit the detailed vessel information form found here.

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      We operate globally

      Anemoi’s head office is in London, but we operate globally and can supply the technology to ports in Europe and Asia.

      Frequently Asked Questions

      Which wind angles do Anemoi Rotor Sails work best in and do they cause additional air drag?

      Anemoi Rotors are automatically controlled to make the most of all wind conditions. Maximum thrust is generated with strong apparent wind from just behind the beam. The Rotors do not generate thrust when wind is within around 10degrees of the bow, in these conditions the Control System ensures that the Rotors add minimal additional drag to the vessel.
      Anemoi’s largest Rotor can generate a maximum of 30kN which at 15 knots vessel speed is equivalent to 2.9MW of propulsion power.

      How much do the Rotor Sails weigh?

      The mass of the Anemoi Rotor Sails is kept to a minimum through intelligent design and the use of advanced materials. The rotating part, the ‘Rotor’, is made from high-tech, lightweight composite materials leading to improved performance and lower weight Tower and supporting structures.

      Including the Rotor, Tower and Foundation, the mass of a medium sized 4 x 28m Anemoi Rotor Sail is 30 tonnes.
      The optimum number of Rotor Sails for any particular vessel is assessed during the Technical Feasibility stage, this takes into account the mass of the installation and any effects on vessel stability.

      How much electricity do the Rotor Sails use?

      Rotor Sails require energy to rotate, this is provided by an electric motor which, in turn, is powered by the vessel generators. Efficient Rotor, Bearing and Drive System design ensures minimum power requirement.

      In favourable wind conditions the propulsion power provided by a Rotor Sail can be over 10 times the input power.

      The Anemoi Control System is integrated with the vessel power management system and is continually making decisions to maximise the overall efficiency of the vessel and ensure that the on-board generator(s) are operated in a safe and efficient manner.

      Are there any safety considerations/implications? Do Rotor Sails impact visibility?

      Crew and vessel safety are at the core of Anemoi’s design. The Control System employs the latest in machine control and monitoring techniques to ensure minimal crew intervention and safely control the Rotor Sails in all conditions.

      All designs are certified and approved by major classification societies to ensure compliance with the latest standards and rules in all conditions. Important SOLAS (safety of life at sea) regulations such as visibility, navigation lights and radar sectors are considered for each vessel during the technical feasibility stage.

      Can the Rotor Sails be used to generate electricity?

      No, the Rotor Sails cannot be used to generate electricity, although this is one common misconception. The Rotor Sails require external electrical power to rotate them in order to utilise the Magnus Effect and produce useful thrust. The Rotors are not rotated by the wind and therefore cannot generate electricity in this way.