A system comprises an elastic mount configured to support a propulsion device with respect to a marine vessel. The elastic mount contains an electromagnetic fluid. An electromagnet is configured so that increasing an amount of electricity applied to the electromagnet increases the shear strength of the electromagnetic fluid in the elastic mount and thereby decreases elasticity of the elastic mount, and so that decreasing the amount of electricity applied to the electromagnet decreases the shear strength of the electromagnetic fluid in the elastic mount and thereby increases the elasticity of the elastic mount. A controller automatically adapts the amount of electricity applied to the electromagnet based on one or more sensed conditions so as to improve performance and/or handling of the marine vessel.

There is disclosed a marine propulsion system for a shaft-driven boat. The system includes a recess formed in the hull of the boat, and a drive cassette. The drive cassette includes: a housing; a static tube extending rearwardly from the housing and fixed relative thereto; and at least one drive shaft extending through the static tube and into the housing. The drive shaft is supported for rotation within the static tube by at least one shaft bearing, and is rotatably supported within the housing by thrust bearings. The static tube, the drive shaft, the or each shaft bearing, and the thrust bearings are all coaxially aligned with one another. The housing and the recess are mutually configured such that the housing may be engaged within the recess to install the drive cassette within the drivetrain of the boat.

There is disclosed a marine propulsion system for a shaft-driven boat. The system includes a recess formed in the hull of the boat, and a drive cassette. The drive cassette includes: a housing; a static tube extending rearwardly from the housing and fixed relative thereto; and at least one drive shaft extending through the static tube and into the housing. The drive shaft is supported for rotation within the static tube by at least one shaft bearing, and is rotatably supported within the housing by thrust bearings. The static tube, the drive shaft, the or each shaft bearing, and the thrust bearings are all coaxially aligned with one another. The housing and the recess are mutually configured such that the housing may be engaged within the recess to install the drive cassette within the drivetrain of the boat.

An anti-theft apparatus for an outboard motor that can be mounted on a boat, comprising a comparison unit configured to compare a vibration of the outboard motor with a vibration of a portion of the boat other than the outboard motor, and a notification unit configured to make a predetermined notification based on a comparison result by the comparison unit.

An anti-theft apparatus for an outboard motor that can be mounted on a boat, comprising a comparison unit configured to compare a vibration of the outboard motor with a vibration of a portion of the boat other than the outboard motor, and a notification unit configured to make a predetermined notification based on a comparison result by the comparison unit.

There is disclosed a marine propulsion system for a shaft-driven boat. The system includes a recess formed in the hull of the boat, and a drive cassette. The drive cassette includes: a housing; a static tube extending rearwardly from the housing and fixed relative thereto; and at least one drive shaft extending through the static tube and into the housing. The drive shaft is supported for rotation within the static tube by at least one shaft bearing, and is rotatably supported within the housing by thrust bearings. The static tube, the drive shaft, the or each shaft bearing, and the thrust bearings are all coaxially aligned with one another. The housing and the recess are mutually configured such that the housing may be engaged within the recess to install the drive cassette within the drivetrain of the boat.

There is disclosed a marine propulsion system for a shaft-driven boat. The system includes a recess formed in the hull of the boat, and a drive cassette. The drive cassette includes: a housing; a static tube extending rearwardly from the housing and fixed relative thereto; and at least one drive shaft extending through the static tube and into the housing. The drive shaft is supported for rotation within the static tube by at least one shaft bearing, and is rotatably supported within the housing by thrust bearings. The static tube, the drive shaft, the or each shaft bearing, and the thrust bearings are all coaxially aligned with one another. The housing and the recess are mutually configured such that the housing may be engaged within the recess to install the drive cassette within the drivetrain of the boat.

A watercraft includes a hull structure, a deck structure, and a propulsion system. The hull structure includes at least one hull each defining an interior. The deck structure is mounted to the hull structure. The propulsion system is adapted for moving the watercraft within a body of water, and includes an electric motor and an energy storage device coupled to the electric motor. The electric motor and the energy storage device are positioned adjacent one another within an area including at least one of the interior of the at least one hull.

A watercraft includes a hull structure, a deck structure, and a propulsion system. The hull structure includes at least one hull each defining an interior. The deck structure is mounted to the hull structure. The propulsion system is adapted for moving the watercraft within a body of water, and includes an electric motor and an energy storage device coupled to the electric motor. The electric motor and the energy storage device are positioned adjacent one another within an area including at least one of the interior of the at least one hull.

An anti-theft apparatus for an outboard motor that can be mounted on a boat, comprising a comparison unit configured to compare a vibration of the outboard motor with a vibration of a portion of the boat other than the outboard motor, and a notification unit configured to make a predetermined notification based on a comparison result by the comparison unit.