How Planing Hulls Operate Displacement Mode: A planing hull, when operated at very slow speeds, will cut through the water like a displacement hull. Plowing Mode: As speed increases, a planing hull will have a raised bow, reducing the operator's vision and throwing a very large wake. Avoid maintaining a speed that puts your boat in plowing mode. Planing Mode: Your boat is in planing mode when enough power is applied so that the hull glides on top of the water. Different boats reach planing mode at different speeds.