A marine propulsion system includes a marine propulsion unit, a first battery for a starter of an engine, a second battery for an electric motor, a third battery for at least one of a plurality of devices in or on a marine vessel excluding the starter and the electric motor, and a charge amount acquisition controller configured or programmed to perform a control to acquire a charge amount of at least one of the first battery, the second battery, or the third battery based on a first power supplied from a power source to the first battery, the second battery, and the third battery, and a second power supplied from the first battery, the second battery, and the third battery to devices in or on the marine vessel.

A marine propulsion system includes a marine propulsion unit, a first battery for a starter of an engine, a second battery for an electric motor, a third battery for at least one of a plurality of devices in or on a marine vessel excluding the starter and the electric motor, and a charge amount acquisition controller configured or programmed to perform a control to acquire a charge amount of at least one of the first battery, the second battery, or the third battery based on a first power supplied from a power source to the first battery, the second battery, and the third battery, and a second power supplied from the first battery, the second battery, and the third battery to devices in or on the marine vessel.

This disclosure describes flanking rudders, including asymmetrically shaped flanking rudders and methods of manufacturing and using asymmetrically shaped flanking rudders. An exemplary asymmetrically shaped flanking rudder includes an exterior surface having a first shape and an exterior surface having second shape different from the first shape.

This disclosure describes flanking rudders, including asymmetrically shaped flanking rudders and methods of manufacturing and using asymmetrically shaped flanking rudders. An exemplary asymmetrically shaped flanking rudder includes an exterior surface having a first shape and an exterior surface having second shape different from the first shape.

A set of parts for marine vessel propulsion assemblies is provided A propulsion unit includes a driveshaft, and a first connection module comprising one or more input shafts, wherein the propulsion unit and the first connection module may form at least a portion of a first propulsion assembly. A second connection module comprising one or more input shafts, wherein the propulsion unit and the second connection module may form at least a portion of a second propulsion assembly. The positions, in relation to the propulsion unit, of output shafts of the first and second connection modules, when the first and second connection modules are mounted to the propulsion unit, are the same. The first propulsion assembly may differ from the second propulsion assembly in that the position, in relation to the propulsion unit, of one or more of the one or more input shafts of the first connection module differs from the position, in relation to the propulsion unit, of any of the one or more input shafts of the second connection module.

A set of parts for marine vessel propulsion assemblies is provided A propulsion unit includes a driveshaft, and a first connection module comprising one or more input shafts, wherein the propulsion unit and the first connection module may form at least a portion of a first propulsion assembly. A second connection module comprising one or more input shafts, wherein the propulsion unit and the second connection module may form at least a portion of a second propulsion assembly. The positions, in relation to the propulsion unit, of output shafts of the first and second connection modules, when the first and second connection modules are mounted to the propulsion unit, are the same. The first propulsion assembly may differ from the second propulsion assembly in that the position, in relation to the propulsion unit, of one or more of the one or more input shafts of the first connection module differs from the position, in relation to the propulsion unit, of any of the one or more input shafts of the second connection module.

A method for controlling a speed of a propeller of a marine propulsion device during launch of a marine vessel comprises receiving a command to initiate an enhanced launch feature of the marine vessel. The method includes increasing a speed of an engine of the marine propulsion device in response to the enhanced launch feature command. While the engine speed increases, the method includes commanding a first amount of engagement of a forward gear controlling torque transfer from an output shaft of the engine to an input shaft of the propeller. After the engine speed reaches a predetermined threshold, the method includes commanding a second, greater amount of engagement of the forward gear controlling torque transfer from the engine output shaft to the propeller input shaft.

A method for controlling a speed of a propeller of a marine propulsion device during launch of a marine vessel comprises receiving a command to initiate an enhanced launch feature of the marine vessel. The method includes increasing a speed of an engine of the marine propulsion device in response to the enhanced launch feature command. While the engine speed increases, the method includes commanding a first amount of engagement of a forward gear controlling torque transfer from an output shaft of the engine to an input shaft of the propeller. After the engine speed reaches a predetermined threshold, the method includes commanding a second, greater amount of engagement of the forward gear controlling torque transfer from the engine output shaft to the propeller input shaft.

A marine power supply system includes a battery unit including a first battery to supply power to a starter that starts an engine, and a second battery to supply power to an electric motor, and a power distributor connected to the first battery and the second battery. The power distributor outputs a demand power amount of power required by the first battery to the first battery, and outputs at least a portion of surplus power to the second battery when a total demand power amount required by the battery unit includes the surplus power.

A marine power supply system includes a battery unit including a first battery to supply power to a starter that starts an engine, and a second battery to supply power to an electric motor, and a power distributor connected to the first battery and the second battery. The power distributor outputs a demand power amount of power required by the first battery to the first battery, and outputs at least a portion of surplus power to the second battery when a total demand power amount required by the battery unit includes the surplus power.