While they look similar, Turbo sails are not Flettner rotors. Turbo sails use an internal fan to draw air into the tubes, and vents are used to control where t

While they look similar, Turbo sails are not Flettner rotors. Turbo sails use an internal fan to draw air into the tubes, and vents are used to control where the air pressure drops. They do not rotate at all.