Abstract: A fluid jacket for a vessel includes a plurality of strips of relatively thin sheet material provided in spaced relation about the exterior surface thereof for defining the exterior surface of the fluid jacket. Each of the strips includes relatively small deformed portions spaced about the surface thereof and extending generally radially inward toward the exterior surface of the vessel. The inner end of each deformed surface is in contact with and affixed to the exterior surface of the vessel. The interior surface of the strips of material and the exterior surface of the vessel define therebetween at least one fluid flow channel for the fluid jacket.

Abstract: A propulsion unit for a vessel of the type having a compartment watertightly sealed from the remainder of the vessel. The propulsion unit includes a cylindrical housing vertically supported within the compartment. A pump having a drive shaft is supported within the housing, the drive shaft extending into the housing coaxial therewith. A deflector is rotatably supported at the outlet of the housing about an axis coaxial with the axis of the drive shaft.