A flexible coupling mechanism may be used to suspend a structural component, such as a propulsion pod, from a support member, such as a strut of a hydrofoil watercraft. The flexible coupling mechanism may include multiple vibration isolating mounts configured to extend through the support member to suspend the structural component. The vibration isolating mounts may include a plurality of elastomeric bushings configured to prevent direct contact between a component rigidly coupled to the support member and a component rigidly coupled to the structural component. The elastomeric bushings may include a tapered outer profile configured to provide a nonlinear force feedback profile in response to rotation of the support member relative to the structural component.

A floating vessel with gearless pod propulsor and counter rotating propellers is secured to a hull, each pod having a lead propeller and a trailing propeller, each propeller connected to a shaft connected to either a stator and rotor or a hydraulic motor. A lead propeller turns in a first direction and a trailing propeller turns in an opposite direction simultaneously, generating thrust for the floating vessel along a thrust vector using the counter rotation of the trailing propeller to recover swirling energy from the lead propeller improving propulsive efficiency of the floating vessel. The pod is positioned below a water line of the floating vessel providing propulsion for the floating vessel without gears.

A marine vessel has a hull with a bottom, a bow, a stern, and a propulsion arrangement including at least three propulsion units arranged at the stern of the marine vessel. The marine vessel has a base line and a centerline. The at least three propulsion units include a fixed centerline shaft propulsion unit with a shaft line and a propeller, and two turnable propulsion units with respective propellers and arranged at opposite sides of the fixed centerline shaft propulsion unit for steering of the marine vessel. For improving thrust efficiency, while maintaining optimal steering capability, the propeller of the fixed centerline shaft propulsion unit is arranged at a given distance aft of the stern of the marine vessel.

Retractable thruster system for moving a thruster (1) on a vessel between an extended position, in which the thruster (1) is extended below a hull's bottom, and at least one retracted position, in which the thruster is located above the hull's bottom, the system comprising a canister (2) to which a thruster is mountable, wherein the canister is configured to be movable in a trunk (3) in a vessel's hull structure between said extended position and said at least one retracted position, and in which a rack-and-pinion lifting system is arranged to move the canister (3) in said trunk (3) between said extended position and said at least one retracted position, the lifting system including at least one rack (6) being fixedly connected to the vessel, and a pinion drive (7) including at least one pinion (8) arranged to cooperate with said at least one rack (6), said pinion drive being connected to the canister (2).

A board can have an upward-facing side arranged to enable a person to stand on the board while surfing. A motor can be attached to a downward-facing side of the board to propel the board. A computer system can use data from sensors and a steering system to actively respond to actions from the person riding on the board.

Controlling marine vessel: obtaining motion data related to the marine vessel; obtaining an operation state related to one or more apparatuses exerting force from the marine vessel to ambient water; detecting a disturbance in one or more degrees of freedom affecting the marine vessel based on the motion data; and determining control data for the one or more apparatuses exerting force to attenuate the detected disturbance.

[Problem to be solved] An object of the present invention is to provide a zero emission power generation sailing ship, wherein generated electric power is consumed for electric demand in the ship or consumed for electric demand in the ship and for driving the ship in response to wind condition, thereby realizing zero emission navigation.

[Means for solving the problem] A zero emission power generation sailing ship comprises a sail provided on a deck, a water turbine-propeller, a power generator-motor which is driven by the water turbine-propeller operating as a water turbine and drives the water turbine-propeller operating as a propeller, and an energy storage device for directly storing electric energy generated by the power generator-motor or converting the electric energy into energy of a substance and storing the substance, wherein the water turbine-propeller operates as a water turbine and the power generator-motor operates as a power generator so as to generate electric power and a part of the generated electric power is consumed for electric demand in the ship and residual part of the generated electric power is stored in the energy storage device when the wind is strong, while the power generator-motor operates as a motor and the water turbine-propeller operates as a propeller and a part of the electric power drawn from the energy storage device is consumed for electric demand in the ship and residual part of the electric power is consumed for driving the power generator-motor operating as a motor when the wind is light, and further comprises a course selecting device provided with a computer program for selecting course based on ocean wind forecasting data so as to prevent exhaustion of the electric power stored in the energy storage device.

The present invention is directed to a modular azimuth thruster for propelling a vessel, having a thruster housing around which water flows, and comprising: a standardized core unit having a core unit housing forming part of the thruster housing, a transmission line arranged within in the core unit housing, comprising a propeller shaft extending in a longitudinal direction of the thruster housing, and a propeller arranged outside the thruster housing and being operationally connected to the propeller shaft. The present invention further relates to a vessel comprising an azimuth thruster and a method of configuring an azimuth thruster.

A floating vessel with gearless pod propulsor and counter rotating propellers is secured to a hull, each pod having a lead propeller and a trailing propeller, each propeller connected to a shaft connected to either a stator and rotor or a hydraulic motor. A lead propeller turns in a first direction and a trailing propeller turns in an opposite direction simultaneously, generating thrust for the floating vessel along a thrust vector using the counter rotation of the trailing propeller to recover swirling energy from the lead propeller improving propulsive efficiency of the floating vessel. The pod is positioned below a water line of the floating vessel providing propulsion for the floating vessel without gears.

A tugboat having azimuthal propelling units, comprising at least two juxtaposed azimuthal propelling units, characterized in that each of the juxtaposed propelling units has a main shaft with a main axis extending at an angle relative to at least one of a main plane of symmetry or a transverse center plane of the tugboat.