Abstract: A watercraft including a hull; a deck; a battery and an electric motor; a cooling system including: a heat exchanger; a closed cooling path in thermal contact with the heat exchanger and the battery; and an open cooling path in thermal contact with a portion of the closed cooling path. Also a cooling system including: a heat exchanger including: a heat exchanger body, a first channel defined in the heat exchanger body, the first channel being in thermal contact with the outer surface for conducting heat therebetween, and a second channel defined in the heat exchanger body, the second channel being in thermal contact with the first channel, a first cooling path in thermal contact with the battery, a portion of the first cooling path being defined by the first channel; and a second cooling path defined by the second channel.

Abstract: A watercraft including a hull including a bottom surface, a channel being defined by the bottom surface; a deck disposed above the hull; a battery disposed in a rear portion of the watercraft below the deck; an electric motor disposed in a forward portion of the watercraft, the electric motor being disposed above the bottom surface of the hull and below the deck, the electric motor being electrically connected to the battery; a propulsion shaft operatively connected to the electric motor at a front end of the propulsion shaft, the propulsion shaft extending downward and rearward from the electric motor, the propulsion shafting passing through the bottom surface of the hull and extending into the channel; a propeller connected to a rear end portion of the propulsion shaft; and a rudder pivotally connected to at least one of the hull and the deck.

Abstract: A universal spark gap electrode with inner conductor formed as an elongate rod, an insulative sheath fit over the inner conductor, and an inner electrode tip soldered or brazed into the inner conductor. The inner conductor passes through an adapter and into an annular base with a spark gap cage and second electrode tip mounted thereon. The adapter is equipped with a molded annular jacket-type adapter mounted exteriorly thereon for engagement with the connecting receptacle of a lithotripsy machine. The annular base has a double-threaded collar that couples over the insulative sheath, and the adapter body screw-couples over the threaded collar of the annular base. This, the annular base, adapter body and insulative sheath are screw-coupled together in a coaxial configuration.

Abstract: A universal spark gap electrode with inner conductor formed as an elongate rod, an insulative sheath fit over the inner conductor, and an inner electrode tip soldered or brazed into the inner conductor. The inner conductor passes through an adapter and into an annular base with a spark gap cage and second electrode tip mounted thereon. The adapter is equipped with a molded annular jacket-type adapter mounted exteriorly thereon for engagement with the connecting receptacle of a lithotripsy machine. The annular base has a double-threaded collar that couples over the insulative sheath, and the adapter body screw-couples over the threaded collar of the annular base. This, the annular base, adapter body and insulative sheath are screw-coupled together in a coaxial configuration.