Abstract: A core replacement system for a dispenser of rolled sheet material, having a core for supporting said rolled sheet material and a part insertable in the core, wherein the core is complementary to and engagable with the part such that it rotates with the core. The core is preferably made of extruded plastic, although injection molded plastic, metal or would also work. The core replacement system enables manufacturers to control which types or brands of paper are used with specified dispensers.

Abstract: An adjustable propeller system includes an outboard drive portion having a propeller. At least one linearly extendable and retractable trim arm is mounted between an outboard plate and the propeller to adjust the trim angle between the outboard plate and the propeller. An upper arm and a lower arm are each pivotally mounted to a transom mounting plate and pivotally mounted to the outboard mounting plate. The upper and lower arm are linearly extendable and retractable to adjust the depth of the outboard drive portion.

Abstract: A boat hull is constructed of inner and outer aluminum skin layers. A foam material and a plurality of spaced frame members are sandwiched between the two skin layers. The skin layers are directly welded to the spaced frame members, which preferably are spaced apart at close intervals, to ensure structural integrity and product performance. A preferred method of constructing a boat hull designed according to this invention includes providing a temporary support structure that is connected to longitudinal beams of the boat hull frame. After spaced frame members are connected to the longitudinal beams a first skin layer is attached. The temporary support structure is then removed and the aluminum skin layers are attached to the spaced frame members. A liquid, curable, closed cell foam preferably is injected into the spacing between the skin layers and the spaced frame members.