Abstract: A boat hull having a bow, an underside and also including at least one transverse step extending at least partly across the hull underside. The boat hull is characterized in the provision of a venting tube which extends from the transverse step substantially adjacent or contiguous with the hull underside to form an outlet adjacent to the bow. Suitably the venting tube does not communicate with the interior part of the hull and also the venting tube defines at least partly the longitudinal axis of a keel of the boat hull.