A powertrain for a marine vessel, comprising an internal combustion engine, a transmission, a first drive unit having a first propeller and a second drive unit having a second propeller, a first electric motor and a second electric motor, where the internal combustion engine is drivingly connected to the first drive unit and the second drive unit through the transmission, that the first electric motor is drivingly connected directly to the first drive unit and that the second electric motor is drivingly connected directly to the second drive unit.

A powertrain for a marine vessel, comprising an internal combustion engine, a transmission, a first drive unit having a first propeller and a second drive unit having a second propeller, a first electric motor and a second electric motor, where the internal combustion engine is drivingly connected to the first drive unit and the second drive unit through the transmission, that the first electric motor is drivingly connected directly to the first drive unit and that the second electric motor is drivingly connected directly to the second drive unit.

A watercraft maneuvering system includes an overboard sensor to detect an operator overboard event when a watercraft operator falls overboard from a watercraft, and a controller provided on the watercraft and configured or programmed to control a propulsion system of the watercraft. The controller is configured or programmed to perform a fixed point holding control operation to control the propulsion system to maintain a fixed position of the watercraft when the overboard sensor detects the operator overboard event. The overboard sensor is provided on the watercraft, and includes a communicator that wirelessly communicates with an operator fob to be carried by the operator. The operator sensor may detect the operator overboard event based on a state of communication between the operator fob and the communicator.

A watercraft maneuvering system includes an overboard sensor to detect an operator overboard event when a watercraft operator falls overboard from a watercraft, and a controller provided on the watercraft and configured or programmed to control a propulsion system of the watercraft. The controller is configured or programmed to perform a fixed point holding control operation to control the propulsion system to maintain a fixed position of the watercraft when the overboard sensor detects the operator overboard event. The overboard sensor is provided on the watercraft, and includes a communicator that wirelessly communicates with an operator fob to be carried by the operator. The operator sensor may detect the operator overboard event based on a state of communication between the operator fob and the communicator.

An internal combustion engine (1) for a vehicle is equipped with a variable compression ratio mechanism (2) capable of changing the mechanical compression ratio. An idle stop, which is for automatically stopping the internal combustion engine (1) when the vehicle stops, and a sailing stop, which is for stopping the internal combustion engine (1) in conjunction with the release of a forward clutch (8) during inertial travel, are carried out. A target compression ratio during normal travel is set on the basis of the load and rotation speed of the internal combustion engine (1). During an idle stop the target compression ratio is set to an idle stop restart compression ratio (εis). During a sailing stop the target compression ratio is set to a sailing stop restart compression ratio (εss). The sailing stop restart compression ratio (εss) is lower than the idle stop restart compression ratio (εis).

An internal combustion engine (1) for a vehicle is equipped with a variable compression ratio mechanism (2) capable of changing the mechanical compression ratio. An idle stop, which is for automatically stopping the internal combustion engine (1) when the vehicle stops, and a sailing stop, which is for stopping the internal combustion engine (1) in conjunction with the release of a forward clutch (8) during inertial travel, are carried out. A target compression ratio during normal travel is set on the basis of the load and rotation speed of the internal combustion engine (1). During an idle stop the target compression ratio is set to an idle stop restart compression ratio (εis). During a sailing stop the target compression ratio is set to a sailing stop restart compression ratio (εss). The sailing stop restart compression ratio (εss) is lower than the idle stop restart compression ratio (εis).

A power train for an amphibian operable in land and marine modes includes a prime mover having an integral speed change transmission, at least a first land propulsion unit, at least a first marine propulsion unit, and a power transmission unit including a drive member configured to couple the prime mover to the at least first marine propulsion unit, wherein the prime mover is arranged to drive the at least first land propulsion unit through/via the integral speed change transmission in the land mode, and the prime mover is arranged to drive the at least first marine propulsion unit through/via the power transmission unit in both the marine mode and the land mode.

A power train for an amphibian operable in land and marine modes includes a prime mover having an integral speed change transmission, at least a first land propulsion unit, at least a first marine propulsion unit, and a power transmission unit including a drive member configured to couple the prime mover to the at least first marine propulsion unit, wherein the prime mover is arranged to drive the at least first land propulsion unit through/via the integral speed change transmission in the land mode, and the prime mover is arranged to drive the at least first marine propulsion unit through/via the power transmission unit in both the marine mode and the land mode.

A multi-plate clutch transmission includes an arrangement for selectively engaging the clutch by moving the sleeve to cause one or more friction disks on a sleeve connected to a shaft to move into contact with one or more friction disks on a clutch basket connected to a gear driven by another gear and another shaft driven by a prime mover. An arrangement for selectively disengaging the clutch is provided that uses prime mover torque to move the one or more friction disks on the sleeve out of contact with the one or more.friction disks on the clutch basket.

A multi-plate clutch transmission includes an arrangement for selectively engaging the clutch by moving the sleeve to cause one or more friction disks on a sleeve connected to a shaft to move into contact with one or more friction disks on a clutch basket connected to a gear driven by another gear and another shaft driven by a prime mover. An arrangement for selectively disengaging the clutch is provided that uses prime mover torque to move the one or more friction disks on the sleeve out of contact with the one or more.friction disks on the clutch basket.