The present application relates generally to a control arrangement for controlling at least two azimuthing propulsion units of a ship. The control arrangement comprises a crash stop activation member for activating a crash stop procedure, after which the crash stop procedure is executed in which the orientation and propulsion speed of the azimuthing propulsion units are controlled until the propagation speed of the ship has at least been reduced from the moment when the crash stop procedure was activated.

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.

External External loading test apparatus comprising: a structure with at least three pillars supporting a platform, the platform being configured to receive a podded electric propulsion motor in a hanging position while allowing operation of said pod, at least a test subsystem, for applying a force on the pod to simulate full scale external loading.

A hybrid marine drive unit mounted to a transom. The drive unit includes a drive housing mounted on the transom, a propelling unit rotatable about a vertical axis and mounted to a lower surface of the drive housing, and a transmission with at least a vertical drive shaft located in the drive housing and extending into the propelling unit. The vertical drive shaft is arranged transmit drive torque from at least one of multiple sources of drive torque. The vertical drive shaft is operably connected to a first source of drive torque arranged within the drive housing, and the vertical drive shaft is operably connected to a horizontal output shaft extending into the drive housing through the transom. The horizontal output shaft is connectable to a second source of drive torque.

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 method for performing a sideway displacement of a marine vessel. The marine vessel includes a first and a second propulsion unit, a first and a second rudder respectively associated with the first and the second propulsion units, and a bow thruster. The first and the second propulsion units, the first and the second rudders and the bow thruster are operable via a single driver interface. The method includes the steps of; via the single driver interface operate the first and the second propulsion units and the bow thruster so as to provide a total thrust and set the rudder angles of the first and the second rudders, to thereby steer the displacement of the marine vessel during the sideway displacement.

An interface unit providing an interface between a control and sensor system of an assisted vessel with thrust capabilities and a master dynamic positioning system. The master dynamic positioning system is configured to control a number of auxiliary vessels as one unit and control the thrust capabilities of the assisted vessel for assisting in maneuvering of the assisted vessel. A master dynamic positioning system comprises the interface unit above. A system for assisting in maneuvering of a vessel with thrust capabilities comprises the master dynamic positioning system controlling a number of auxiliary vessels as one unit for assisting in maneuvering of an assisted vessel. A dynamic positioning system of each of the auxiliary vessels is controlled by the master dynamic positioning system. The master dynamic positioning system controls the thrust capabilities of the assisted vessel. The master dynamic positioning system may be provided on-board a tugboat.

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.

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 method and an arrangement for sealing a propeller shaft located under water. The propeller shaft is arranged at a pod of a ship and an air chamber is provided circumferentially around the propeller shaft. The method includes supplying compressed air from a compressed air source to the air chamber, discharging compressed air from the air chamber in an air return line and colleting liquid present in the compressed air discharged from the air chamber in an intermediate leakage tank that is provided in the air return line. The method includes closing the air return line upstream of the intermediate leakage tank, and supplying compressed air to the intermediate leakage tank to effect flowing of liquid present in the intermediate leakage tank to a leakage tank.