sentences:  On an aircraft, flaps increase the camber or curvature of the wing, raising the maximum lift coefficient—the lift a wing can generate—at lower air speeds (speed of the air passing over it).A wingsail has the same need for camber adjustment, as windspeed changes—a straighter camber curvature as windspeed increases, more curved as it decreases.Mechanisms for camber adjustment are similar for soft and hard wingsails.