Abstract: A transducer assembly for mounting to an interior surface of a hull includes a base for securing the assembly to the interior surface of the hull. A mounting member for mounting to the base is rotatably positionable relative to the base about a rotational axis. A transducer element is secured to the mounting member for generating soundwaves that travel in an acute angular direction relative to the rotational axis. Rotation of the mounting member relative to the base about the rotational axis changes the direction of travel of the soundwaves. A retaining device locks the mounting member in place relative to the base.

Abstract: A through-hull speed sensor of the magnetized paddlewheel sensor type wherein a paddlewheel is rotatably supported in a cavity adjacent a magnetic sensing device which generates electrical pulses corresponding to paddlewheel speed as the wheel rotates when the vessel moves through water. The sensor has improved linearity provided by a flow channel recessed in a downstream surface of a sensor mounting member. The recessed flow channel raises the trailing edge above the leading edge, thereby reducing pressure on a back wall of the cavity where the pressure is due to fluid flow through the paddlewheel.

Abstract: A low cost phased array sonic transducer is described in which an array of transducer elements separated by spacers are held within a frame which applies a compressive force transverse the length of the elements.