Flettner rotor

A Flettner rotor is a tall spinning vertical cylinder that generates forward thrust from a crosswind through the Magnus effect, the most commercially mature form of wind-assisted propulsion. Installed on tankers, bulkers, and ro-ros, rotors deliver fuel and CO2 savings that vary with route and wind, commonly 5 to 15 percent on favorable trades. The saved propulsion energy counts toward EEXI and CII through the innovative-technology provisions and the wind-propulsion correction factor in the EEDI framework. Maker examples include Norsepower and Anemoi.