A marine propulsion device for propelling a boat is provided The marine propulsion device includes a motor including an output shaft, a drive shaft configured to rotate upon receiving a rotation of the output shaft, a propeller shaft provided with a propeller and configured to be rotated upon receiving a rotation of the drive shaft, and a cooling device. The cooling device includes a cooling mechanism configured to cool the motor, and a water pump configured to send water outside the marine propulsion device to the cooling mechanism. An impeller of the water pump is connected via a one-way clutch to the output shaft, the drive shaft, or a rotation transmission member other than the drive shaft provided in the marine propulsion device and configured to rotate by the rotation of the output shaft.

A steering system for a vehicle includes a hydraulic steering system configured to, in response to a steering input provided at a steering mechanism of the vehicle, control a pump to control a steering device to steer the vehicle, a sensor configured to sense an angle or position associated with the steering input provided at the steering mechanism, an electric power steering system configured to receive a signal from the sensor and provide powered steering assistance to the hydraulic steering system based on the signal and a pump-slip offset associated with the pump, and a controller configured to determine the pump-slip offset. The pump-slip offset corresponds to a difference between the angle or position associated with the steering input and an actual position of the steering device achieved by the pump.

A steering system for a vehicle includes a hydraulic steering system configured to, in response to a steering input provided at a steering mechanism of the vehicle, control a pump to control a steering device to steer the vehicle, a sensor configured to sense an angle or position associated with the steering input provided at the steering mechanism, an electric power steering system configured to receive a signal from the sensor and provide powered steering assistance to the hydraulic steering system based on the signal and a pump-slip offset associated with the pump, and a controller configured to determine the pump-slip offset. The pump-slip offset corresponds to a difference between the angle or position associated with the steering input and an actual position of the steering device achieved by the pump.

A device for the roll-stabilization of a watercraft in motion, at anchor, or at zero speed, and/or for influencing the course of the watercraft, includes a fin-carrying shaft on which a guide fin is disposed. For changing an actual angle of attack of the guide fin in the water, the fin-carrying shaft is drivable by an electromechanical drive unit, and the drive unit is disposed on the hull using a base. An electromechanical drive unit is configured with a synchronous motor that drives the fin-carrying shaft using a reducing eccentric transmission. The device thereby has a significantly reduced installation space requirement, causes only slight operating noises, and is also optimally electronically regulable.

A device for the roll-stabilization of a watercraft in motion, at anchor, or at zero speed, and/or for influencing the course of the watercraft, includes a fin-carrying shaft on which a guide fin is disposed. For changing an actual angle of attack of the guide fin in the water, the fin-carrying shaft is drivable by an electromechanical drive unit, and the drive unit is disposed on the hull using a base. An electromechanical drive unit is configured with a synchronous motor that drives the fin-carrying shaft using a reducing eccentric transmission. The device thereby has a significantly reduced installation space requirement, causes only slight operating noises, and is also optimally electronically regulable.