Patent ID: 8201513

Claim:
A boat hull, comprising: a boat hull having an exterior surface, with at least one step surface portion defined therein which changes the configuration of a lower surface of the hull; a support system comprising a channel or flange support assembly which are fixed and extend substantially parallel longitudinally of the hull a selected distance from a start point which is located toward the bow of the boat; and a member positionable in the support system, wherein the member is movable along the support system wherein the channel or flange support system are open at an aft end thereof, wherein the member is supported to be movable along the support assembly approximately parallel to the hull of the boat and wherein a stern end of the member forms a step surface portion and can be fixed at selected locations along the hull, including beyond the aft end of the open support system or flange support assembly, thereby changing the position of a stern end of the movable member and hence the position of a step surface in the hull surface.