A cone-shaped wing allows constant propulsion for pulling and lifting various loads. Sails in the shape of a flattened cone with an axis offset downward, whose base is connected to the leading edge in the shape of an oval with a rectilinear and horizontal base and the opposite side that is cut out in the form of a water droplet delimits the trailing edge, offer ranges whose aerodynamic force resultants are opposite one another. Two upper and two lower control lines are distributed around the leading edge and are connected at the other end to a control system designed to keep the two left lines separated from the two right lines and varying the length of the upper lines relative to that of the lower lines. The wing continuously delivers its power in the direction of the wind or on the side while being immobile when the user is stopped.