The principle on which the Auxiliary Wind Propulsion - Rotor Sail operates is known as the Magnus effect. When wind meets the spinning Rotor Sail, the air flow accelerates on one side of the Rotor Sail and decelerates on the opposite side of the Rotor Sail. The difference in the speed of the air flow results into a pressure difference, which creates a lift force that is perpendicular to the wind flow direction. The same principle applies to rotating spheres and cylinders. This can also be observed for example in golf, tennis or football, where spinning balls curve in flight.



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