Abstract: A marine engine coupler for connecting a sterndrive input shaft to an engine flywheel. A splined central shaft connects the sterndrive input shaft to the coupling. Polyurethane dampers interface between the engine to the sterndrive to reduce vibration. There is a visual indicator on the coupler to allow the user to assess the integrity of the dampening material and give the user an indication that the dampening materials needs to be replaced.

Abstract: A method and apparatus for limiting the torque from an engine to the drive train of a watercraft. A torque limiting clutch is mounted to the flywheel of the engine. The output of the clutch is connected to the drive train of the watercraft. The clutch allows all of the engine's torque to be delivered to the drive train during normal conditions and less than all of the engine's torque to be delivered to the drive train during conditions in which the drive train experiences periods of excessive force. When normal conditions return, the apparatus automatically delivers all of the engine's torque to the drive train.

Abstract: A water pickup device for providing cooling water to a cooling system for an internal combustion engine in a boat by drawing cooling water from the surrounding water in which the boat is floating. A moveable water intake tube is mounted in a housing mounted to the hull of the boat. The intake tube provides a fluid passageway from the surrounding water to the engine cooling system. The intake tube automatically moves up or down in response to the speed of the boat moving through the water. This provides constant water pressure to the cooling system while providing minimum drag on the boat at high speeds.

Abstract: A unique method for automatically monitoring, trimming, and adjusting or synchronizing multi-propeller drives of a boat to remain aligned with each other in the desired trim positions during operation. In each instance that a driver or operator activates all of the stern drives at the same time to adjust or synchronize the trim, the position of each of the propeller drives is monitored by the system. If any of the propeller drives are found not to be in alignment or out of synchronization with one another, the system will automatically make the appropriate adjustments in the necessary propeller drive(s) to synchronize all of the stern drive into the same desired trim positions. An automatic calibration process is also provided to ensure that the system has, and is using, accurate position data.

Abstract: A method and apparatus for limiting the torque from an engine to the drive train of a watercraft. A torque limiting clutch is mounted to the flywheel of the engine. The output of the clutch is connected to the drive train of the watercraft. The clutch allows all of the engine's torque to be delivered to the drive train during normal conditions and less than all of the engine's torque to be delivered to the drive train during conditions in which the drive train experiences periods of excessive force. When normal conditions return, the apparatus automatically delivers all of the engine's torque to the drive train.

Abstract: A method and apparatus for limiting the torque from an engine to the drive train of a watercraft. A torque limiting clutch is mounted to the flywheel of the engine. The output of the clutch is connected to the drive train of the watercraft. The clutch allows all of the engine's torque to be delivered to the drive train during normal conditions and less than all of the engine's torque to be delivered to the drive train during conditions in which the drive train experiences periods of excessive force. When normal conditions return, the apparatus automatically delivers all of the engine's torque to the drive train.