Last week, the Finnish marine engineering company, Norsepower Oy Ltd, was awarded €2.6M in funding to further its research and development of the Norsepower Rotor Sail Solution technology. The new models of the technology will include the world’s largest ever Flettner rotor. The funding provided jointly by the European Commission, and the Finnish Government’s funding agency for Innovation, Tekes, will be used to optimize the Norsepower Rotor Sail design.
A Flettner rotor is vertical spinning cylinder which acts as a motor powered sail. When wind blows across the rotating cylinder, lift is developed at 90 degrees to the wind flow by what is termed the Magnus effect. Installed on the deck of a ship, Flettner rotors develop thrust similar to conventional sails, except that they can achieve roughly ten times the thrust per surface area as compared to a traditional rig. Anton Flettner, the inventor of the rotors, sailed across the Atlantic in a two rotor ship in 1926. Flettner’s ship relied entirely on the wind for propulsion. Current designs are intended to be primarily motor ships with rotor sail auxiliary power to reduce fuel consumption, with targeted savings from 5 – 30%.