A sealing system for sealing a shaft located under water includes a bush mountable on the shaft and fixed to the shaft, a housing fixed with respect to the bush and surrounding a first portion of the bush, a lubricant chamber and an air chamber in the housing and open to the bush, the lubricant chamber being sealed with respect to the air chamber by a seal ring, a mechanical seal outside the housing and surrounding a second portion of the bush, an air supply line and an air discharge line connected to the air chamber, and a quantity of lubricating oil in the lubricant chamber, the lubricating oil being in fluid communication with a lubricant tank via at least one oil line, wherein an air pressure in the air chamber is greater than an oil pressure in the lubricant chamber.

A watercraft and associated pedal drive system are provided. The pedal drive system allows for unassisted manual pedaling to provide thrust to the watercraft. The pedal drive system also provides on demand pedal assistance of varying levels via an assist drive train having an electric motor to supplement the manual pedal force input provided by a user at the pedals of pedal drive system.

A propulsion device for rotating a propulsor to propel a marine vessel. The propulsion device includes a drive housing having a cavity that extends along a first central axis. A motor is positioned within the cavity. The motor rotates a shaft extending along a second central axis that is non-coaxial with the first central axis. The shaft is configured to rotate the propulsor to propel the marine vessel.

A ship comprising a hull having a transom and a bottom, and an azimuthing propulsion unit arranged to the bottom of the ship hull, which azimuthing propulsion unit comprises a propeller. The azimuthing propulsion unit comprises an exposed operation mode in which the propeller sets, behind the transom of the hull and that the azimuthing propulsion unit is rotatable and comprises a protected position mode in which the azimuthing propulsion unit stays below the hull of the ship.

A method and system for providing a watercraft device are disclosed. The watercraft device comprises a board, a throttle coupled to a top surface of the board, a hydrofoil coupled to a bottom surface of the board, and an electric propeller system coupled to the hydrofoil. The electric propeller system powers the watercraft device using information generated from the throttle. A center of buoyancy in a non-foiling mode of the watercraft device and a center of lift in a foiling mode of the watercraft device are aligned.

A ship comprising a hull having a transom and a bottom, and an azimuthing propulsion unit arranged to the bottom of the ship hull, which azimuthing propulsion unit comprises a propeller. The azimuthing propulsion unit comprises an exposed operation mode in which the propeller sets, behind the transom of the hull and that the azimuthing propulsion unit is rotatable and comprises a protected position mode in which the azimuthing propulsion unit stays below the hull of the ship.

A watercraft and associated pedal drive system are provided. The pedal drive system allows for unassisted manual pedaling to provide thrust to the watercraft. The pedal drive system also provides on demand pedal assistance of varying levels via an assist drive train having an electric motor to supplement the manual pedal force input provided by a user at the pedals of pedal drive system.

A thruster assembly that in addition to propulsion provides water flow to/from compartments and systems on board a vessel. In a first position, the thruster assembly provides propulsion/steering. Pivoted to a second position, operation of the thruster in a first direction draws a flow into the vessel and in a second direction draws a flow out of the vessel. The flows may be conveyed to/from compartments/systems on board the vessel via conduits in communication with a chamber having an opening through which the thruster drives the flows. The flows may be used to submerge/surface the vessel, or to provide systems cooling or serve other functions. Pivoted to a third position the thruster assembly is retracted and enclosed within the chamber to form a hydrodynamically clean exterior.

A twin hull foldout watercraft that quickly and easily deploys from a small mobile and portable size unit that will fit into a vehicle or stow in a closet, camper or larger boat to a dry stable watercraft that could be used with small motor, paddles, ores, stand up paddles, push poles or sail and which has all parts and accessories attached thereto. The twin hull foldout watercraft comprises a central deck, two side mounted hull flaps hingedly attached to the opposing side edges of the central deck and positionable in a vertical or horizontal position, a fore deck extension member hingedly attached to the front edge of the central deck and positionable in a vertical or horizontal position, and an aft deck extension member hingedly attached to the rear edge and which can be extended out from the rear of the central deck.

There is provided systems and methods for stabilising a vessel against a stationary structure. Embodiments of the system include a sensor system, a processor, and a vessel control system. The processor is configured to determine a change in the position and/or motion of the waterborne vessel relative to the stationary structure based on sensor data, and to determine a minimum corrective force required to oppose the change. The minimum corrective force is then delivered by the vessel control system operable to stabilise the waterborne vessel relative to the stationary structure.