Abstract: A rotational molded boat or equivalent floatable marine structure has parallel hull walls interconnected by rows of spaced apart, molded V-shaped connectors. The connectors are formed in the rotational molding process. One of the mold sections has a mold surface for forming one of the hull walls, said surface having one or more rows of V-shaped indentations projecting toward an opposite mold surface. The V-shaped indentations have apexes that are spaced apart from the opposite mold surface by a distance that, during the molding process, will fill with molten material to form a molded connection between the finished hull walls. In another embodiment, a lattice structure is assembled to the mold and molded in between side wall components of the hull.

Abstract: A hot air slurry dryer having a cylindrical housing with a central shaft rotatably mounted in the housing. Material to be dried moves from an upstream end of the housing to an outlet at a downstream end. A hot air inlet is connected to the upstream end of the housing preferably at an upstream end wall. A material inlet is open to the side wall of the housing downstream of the hot air inlet. The shaft carries structure for breaking up the moist material introduced into the housing and mixing it with the hot air. In a preferred embodiment a drum is carried by the shaft at the inlet end of the cylindrical housing. The drum carries a plurality of agitator blades that pass close by the interior surface of the side wall of the housing.