Abstract: A cover for an object, such as a boat, that can accommodate at least one optional feature of the object. The cover has at least one area that can be expanded to accommodate an optional feature of the object or collapsed if the object does not have an optional feature.

Abstract: The invention relates to a movable fin assembly, which includes a housing attachable to an underside of a watercraft and a rotation and pivoting mechanism. The mechanism positioned inside the housing and movable about two axes of rotation. The mechanism further has a fin locating position, thereby a fin provided at the fin locating position is capable of moving about the two axes of rotation via the mechanism, such that the fin's toe angle and camber angle changes when moving through the water. The invention further extends to an interchangeable self-aligning fin and static fin kit which includes a rotation and pivoting mechanism and a static member shaped and dimensioned to correspond with an interior of the housing. The static member and the rotation and pivoting mechanism interchangeably receivable by the housing in order to selectively provide a dynamic or static fin on the underside of the watercraft.

Abstract: The invention relates to a floating vessel comprising a hull, at least one seat, and two outriggers arranged laterally to the hull and connected directly or indirectly to the hull, wherein a drive unit, separately controllable in its drive output, and comprising a respective at least one propeller driven by a motor, in particular an electric motor, is assigned to each outrigger. A helm of the floating vessel is thereby connected to a proportional transducer, and a control signal from the proportional transducer is supplied to a control unit which directly or indirectly controls the motors in accordance with the control signal from the proportional transducer. Thus, a precisely controllable and yet easily disassemblable floating vessel is provided.

Abstract: A mooring line (10) comprising a metal chain (24) and an elastomeric element (28) which is attached between two points of attachment (30, 32) thereby defining a bypass section (34) of metal chain (24). The elastomeric element (28) is arranged such that when an initial tensile load is applied, the elastomeric element (28) stretches from an initial length to a longer length wherein the bypass section (34) is not taut and thus the initial tensile load is transmitted from and to further sections (24) of the metal chain through the elastomeric element (28). When a further tensile load is applied, the elastomeric element (28) stretches to a length wherein the bypass section (34) becomes taut, and thus the further tensile load is transmitted directly from and to the further sections (24) of the metal chain through the bypass section (34).

Abstract: Systems and methods for righting a capsized watercraft are described. The system may include a selectively inflatable bladder inside a canvas gunwale float that can be releasably attached to one side of a boat. When the other side of the boat is lifted, the float keeps at least a portion of the lowermost gunwale above the surface of the water, thereby impeding the unwanted entry of water into the boat during righting. The inflatable bladder is sized in volume according to the size and shape of the boat. The system may include one or more floats spaced apart along the side. In another aspect, one of the floats may be attached to a paddle to create a temporary outrigger for use in climbing out of the water and into the boat.

Abstract: The arrangement includes at least one steering electric motor rotating the propulsion unit via a force transmission arrangement. The force transmission arrangement includes a differential including a first shaft connected to the steering electric motor, a second shaft connected to the propulsion unit, and a third shaft connected to a brake device. The third shaft is locked from rotation when a torque produced by an external force on the propulsion unit is below a threshold value, whereby power is distributed only from the steering electric motor to the propulsion unit or vice a versa. The third shaft is allowed to start rotating when the torque produced by the external force on the propulsion unit exceeds the threshold value, whereby power is distributed from the steering electric motor to the rotation of the propulsion unit and to the brake device or from the rotation of the propulsion unit to the steering electric motor and to the brake device.

Abstract: Watersport board fins with fin retention systems and associated watersport boards and methods. A fin includes a hydrodynamic blade and a fin base extending from the hydrodynamic blade. The hydrodynamic blade defines a fin plane and includes a leading edge, a trailing edge, and a foil surface. The fin further includes a fin retention system with a selective retention system that includes a retainer and an actuator coupled to the retainer via a pivot shaft. The actuator forms a portion of the hydrodynamic blade when the selective retention system is in a locked configuration and is configured to rotate away from the fin plane when the selective retention system transitions from the locked configuration to an unlocked configuration. The retainer is configured to rotate away from the fin plane when the selective retention system transitions from the unlocked configuration to the locked configuration.

Abstract: A marine thruster includes a cylinder with a front opening and a rear opening; radial baffles positioned within an interior of the cylinder to separate the interior into equally divided water chambers; pistons positioned within a corresponding one of the equally divided water chambers; and an inner-ring rotary valve engaged with the cylinder to allow for side intake of water and the separation of each of the equally divided water chambers into a dry section and a wet section by pistons; the pistons engage with a power source, the power source providing axial reciprocating motion; and the pistons push water through the equally divided water chambers.

Abstract: A monofin has a fin having a left fluke, and right fluke, and a hinge section that hingedly connects the left fluke and the right fluke. The monofin also includes a left foot pocket connected to the left fluke, a right foot pocket connected to the right fluke, and a hinge assembly that hingedly connects the left foot pocket and the right foot pocket.

Abstract: According to one aspect of the present disclosure, a floating vessel, particularly an LNG carrier, is described. The floating vessel comprises: a gas turbine engine-generator assembly configured to generate a first electrical power and to supply the first electrical power to an electrical distribution system; a steam turbine engine-generator assembly configured to generate a second electrical power and to supply the second electrical power to the electrical distribution system; a propulsion system configured to propel the floating vessel using a propulsion power supplied from the electrical distribution system, wherein the gas turbine engine-generator assembly is configured to generate a maximum first electrical power between 10 MW and 18 MW, particularly between 14 MW and 15 MW at 25° C. According to a further aspect, a method of operating a floating vessel is described.

Abstract: A rigid or inflatable stand up paddleboard (SUP) conversion kit to provide a stable recreational platform for fishing. diving, hunting, nature photography, birdwatching or other activity. A detachable frame positions a pair of pontoons rearward relative to the SUP to avoid interference with rowing. A rolling storage case stores activity accessories such as diving or fishing equipment. After securing the storage case to the SUP, the case serves as a storage seat. A rear canopy frame may be assembled onto the SUP in order to support a rear canopy to conceal the user; and a front canopy frame may assembled onto the SUP in order to provide additional concealment that may be used for a hunting dog. The various conversion kits are compact and self-contained, and can fit easily in the trunk of a car.

Abstract: A propulsion assembly utilizes at least one fluid propulsion chamber operationally attached or mounted to a vessel. Each fluid propulsion chamber generally comprises an outer housing and an inner sleeve; the outer housing is slidably disposed relative to the inner sleeve. Each inner sleeve further includes at least one water intake vent or aperture, and at least one outlet nozzle or jet. Pedal assemblies are moveably mounted within elongated slots or apertures extending through the vessel. A linkage assembly operationally connects the pedals to the at least one fluid propulsion chamber. Force imparted on said pedals (such as by the legs/feet of a user) is transferred to the fluid propulsion chambers by said linkage assembly to generate positive thrust to propel the vessel.

Abstract: A water floating device that offers support for the head or neck of a user when swimming or practicing water exercises. The floating support device includes a unitary piece body made of a floating and waterproof material. The unitary piece body has a U-shape including a curved central section having a first leg on a first end and a second leg on a second end. The first leg and the second leg project from the curved central section. The first leg and the second leg angle inwardly to one another.

Abstract: Disclosed is an ROV propeller tailhood comprising a body a control circuit board, a heat block, a thermal silica gel and long rod screws. The heat sink is fixed to the bottom of the control circuit board and disposed between the control circuit board and the body. The heat sink and the body are provided respectively with apertures that are matching with the long rod screws for fixing the heat sink to the body. The cooling silica gel is provided between the control circuit board and the heat sink.

Abstract: A shock absorbing system of an amphibious and remotely controlled vehicle is provided, including a chassis, a controller, a transmission shaft, six transmission members, a front wheel driving mechanism, a rear wheel driving mechanism and a smart electronic device. When the smart electronic device transmits a first control message, the controller drives the transmission shaft to pivot toward a first direction, the transmission shaft leads the six transmission members to pivot and the controller and the chassis move away from the casing of the remotely controlled vehicle. When the smart electronic device transmits a second control message, the controller drives the transmission shaft to pivot toward a second direction, the transmission shaft leads the six transmission members to pivot and the controller and the chassis move toward the casing of the remotely controlled vehicle.

Abstract: A submersible habitat chamber providing a contained environment for repairing subsea cable is provided. The habitat chamber includes first and second shell parts assembled to at least partly define the contained environment, a first seal provided between the first and second shell parts, a cable seal provided for engagement with the cable, and at least one access port through at least one of the shell parts to allow a user to access the contained environment from outside the habitat. A method of using the habitat chamber and a kit for assembly of the chamber are also provided.

Abstract: A surfboard having laterally opposed pairs of axial or lengthwise grooves with the pair forming opposed rails of greater stiffness and reduced mass. At least one of the grooves of each pair is at a board edge extremity and the other groove is nearby, preferably near or on the lower side of the surfboard. The grooves may be laid up with epoxy or fiberglass.

Abstract: A propeller propulsion system for a watercraft includes at least one electric motor and a propeller which can be driven by the electric motor. The propeller is a surface piercing propeller. The propulsion system includes a box-like body having a side wall on which the electric motor is fixed and a cover part on which an outdrive of the surface piercing propeller is applied. The side wall and the cover part include holes through which a shaft of the motor and a shaft of the outdrive respectively pass. The box-like body includes means for transmission of motion from the drive shaft to the outdrive shaft, and the propulsion system includes means for fixing the box-like body to a transom of the watercraft.

Abstract: The present disclosure relates to a vessel that comprises at least one super structure configured to at least in part translate relative to said hull between a first position and at least one other position. The at least one superstructure in said first condition at least in part defines a first zone suitable for accommodating at least one person and/or vehicle, and the at least one superstructure in said second condition at least in part defines a second zone suitable for accommodating at least one person and/or vehicle. Preferably the at least one superstructure at least in part separates the first and second zones. Preferably the vessel's centre of mass is aft of mid-ship in the first condition and forward of mid-ship in the second position.

Abstract: An apparatus for towing geophysical sources includes a housing; a first geophysical source disposed in the housing so that the first geophysical source is partially exposed to a surrounding environment; and a plurality of ballast tanks coupled to the housing and configured to at least one of: change a buoyancy of the source towing system; and shift a center of mass of the source towing system. A method of towing a geophysical source includes towing a source towing system through a body of water at a towing depth; and operating a plurality of ballast tanks of the source towing system to at least one of: change a buoyancy of the source towing system; and shift a center of mass of the source towing system.