Abstract: An underwater muzzle suppressor system for directing away from a user the blast pressure of a firearm has an interior cylinder with a rearward end and a forward end with primary axial slots formed in the interior cylinder adjacent to the rearward end. An exterior cylinder has a rearward end and a forward end with secondary axial slots formed in the exterior cylinder adjacent to the forward end. A cylindrical chamber is created between the interior cylinder and the exterior cylinder. A rearward disk is received over the rearward end of the interior cylinder. The rearward disk is coupled to the rearward end of the exterior cylinder. A forward disk receives the forward end of the interior cylinder. The forward disk is coupled to the forward end of the exterior cylinder. A plurality of axial holes are in the forward disk.

Abstract: A trailer the spring for boat trailers the spring being readily fabricated from corrosion resistant materials and in particular aluminum, stainless steel and polymeric materials. The trailer spring has a base which is secured to a frame component. An elongated beam is pivotly attached to one end of the base such that the other end of the beam can pivot in relation to the base in a vertical fashion. Positioned between the pivoting end of the beam and the base is a section of an elastomeric material which may be compressed between the pivoting end of the beam and the base. The section of elastomeric material may be retained in a holder. In the preferred embodiment the beam has a U shaped cross section which has upstanding sidewalls which project around the base and the horizontal frame component when the spring is compressed. The projection of the beam around the base and frame component tends to increase the transverse stability of the trailer. Integral with the subject trailer spring is the trailer axle.

Abstract: A solar heater control system is disclosed for use with a water reservoir and a solar collector. Forced circulation of water in the solar heater system is provided by a pump, and valve means provides direct control of water flow in various parts of the solar heater system. Both the pump and the valve means are collected by control means which accepts inputs in the form of temperatures sensed in the water reservoir and in the solar collector. The control means controls the pump and the valve means to cause circulation of water within the system when sensed conditions are suitable for heating, and automatic drainage of the solar collector is effected whenever freezing or over temperature conditions are sensed, or when a power failure occurs. When neither heating conditions nor drainage conditions are sensed, fluid communication between the solar collector and the remainder of the system is terminated by the valve means to isolate the water in the solar collector from the water in the remainder of the system.