Abstract: A system and method for a stand up paddle board that utilizes a vertical hollow protrusion through the paddle board that supports the propulsion system and is comprised of two assemblies; a motor and propeller assembly, and a battery and control assembly, the location of the hollow protrusion mitigating the negative aspects of propelling the board with a propeller and the extra weight of the motorized system on the board's balance and maneuverability characteristics.

Abstract: A system and method for a stand up paddle board that utilizes a vertical hollow protrusion through the paddle board that supports the propulsion system and is comprised of two assemblies; a motor and propeller assembly, and a battery and control assembly, the location of the hollow protrusion mitigating the negative aspects of propelling the board with a propeller and the extra weight of the motorized system on the board's balance and maneuverability characteristics.

Abstract: Conversion of a stand up paddle (SUP) board or similar personal watercraft to enable it to be powered by a battery and an electric motor and propeller apparatus requires a practical and performance oriented configuration to be successful. This patent describes an optimal configuration that utilizes a vertical hollow protrusion through the stand up paddle board that supports the propulsion system and is comprised of two assemblies; a motor and propeller assembly, and a battery and control assembly. The location of the hollow protrusion on the board is a critical feature of this invention. Placing the hollow protrusion in a central location on the board mitigates, to the greatest extent possible, the negative aspects of propelling the board with a propeller and the extra weight of the motorized system on the board's balance and maneuverability characteristics. This is accomplished by locating the hollow protrusion and equipment associated with the motorized system relatively close to, and forward of the rider.

Abstract: A rock drill bit for continuous drilling through overburden and rock has a body with end and side surfaces. The drill bit is constructed for rotation in a predetermined direction. The body defines a conduit for compressed air which terminates at a port in the side surface of the body. The port is disposed to open in a direction facing generally away from the predetermined direction of rotation of the drill bit.