Our Flettner Rotors
We Are Anemoi – Taking from History to Define the Future
Anton Flettner, a German inventor, first installed his Roto Sails onboard a vessel in 1921, pioneering this form of Wind Assisted Ship Propulsion. Since then, there have been several Flettner rotor designs that have demonstrated the fuel saving potential of the technology – but none have achieved commercial success.
Flettner rotors capitalize on the Magnus Effect. Comprising vertical cylinders, which are driven to rotate, they exploit the wind to radically assist propulsion of a ship. Sometimes called ‘rotor sails’, we think of them as very efficient ‘mechanical sails’.
Now, Anemoi have confronted the various barriers that prevent adoption of this green technology and are leading the effort to roll-out Flettner Rotors.
- Power generated on board is used to rotate the rotors,
- Rotors harness energy in the wind,
- Propulsive force is generated,
- Load on the main engine is reduced, (or vessel speed is increased)
- Main engine fuel consumption is lowered, (for a given speed)
- Net fuel saving is delivered.
Our Flettner Rotors use composite materials and are designed, manufactured and finished to high quality standards in the UK. Material selection and qualification is driven by the need to achieve a long design life in the harsh marine environment and onerous operating and survival conditions.
Our innovative production and assembly methods are under continuous development and we are moving towards an advanced design, optimised for high production volumes.
The entire machine (we call it a ‘Wind Engine’) is comprised of a steel structure, mechanical, electrical, control and access systems in addition to the composite rotor.
Anemoi’s approach of installing multiple FR’s onboard large vessels offers many advantages with regard to cost effectiveness, risk, reliability, redundancy and strengthening requirements. Central to Anemoi’s approach is a Wind Engine and Rotor design that is common across a wide range of installation applications on different types of vessels.