A speed control method for a marine vessel includes applying a subtraction process to a throttle opening of a power source of the marine vessel based on a vertical speed of a hull of the marine vessel.

A watercraft and a waterproof electronics container are provided. The watercraft includes a flotation portion. A strut is removably affixed to a portion of the watercraft. A first connector portion is mounted to the upper end of the strut. A waterproof electronics container includes a second connector portion is disposed such that the second connector forms at least one electrically conductive pathway with the first connector portion when both are affixed to the watercraft. The waterproof electronics container is removably affixed to the said watercraft. In one aspect, the waterproof electronics container houses a power source capable of powering an electric motor that propels the watercraft.

A speed control method to control a speed of a marine vessel includes determining a vessel speed based on a first moving average value which is a moving average value of a vertical speed of a hull, or a moving average value of a vertical acceleration of the hull, and based on an occurrence probability density distribution of a wave height.

Disclosed herein is a multifunctional stand-up paddleboard (MFSUP) comprising a paddleboard, a paddle, and a drive unit. At the stem of the paddleboard is a docking port configured to receive the drive unit that propels the paddleboard. In some embodiments, the paddleboard comprises a rigid midsection, and an inflatable bow and stem. The inflatable portions are inflated during use and deflated then folded over the midsection during storage. A control paddle having control switches send command signals by Bluetooth to the drive unit to control the velocity of propellors. A battery bank is disposed on the midsection and provides power to the drive unit. A solar panel can be included on a superior surface of the paddleboard to supply power to the battery bank. The drive unit is removable from the docking port for propelling a human through a water body. Other features and methods are also disclosed.

A marine vessel to transmit a rescue signal includes a hull, a propulsion force generator to generate a propulsion force to propel the hull, and a controller. In the marine vessel, the controller is configured or programmed to acquire vessel speed information regarding a vessel speed of the hull, and determine whether or not rescue is necessary based on the vessel speed information in a case where operation of the propulsion force generator is stopped.

A wind turbine system comprises a vessel; a wind turbine mounted to the vessel, the wind turbine comprising rotor blades configured to convert an airstream to rotational shaft power, and an electrical generator configured to convert the rotational shaft power to electrical power; a hydrogen production system configured to be powered by the electrical generator; a propulsion system configured to propel the vessel via power from the electrical generator; and a steering system to control orientation of the vessel relative to the water and the airstream. A method of producing hydrogen comprises floating a vessel in open sea in areas of wind; rotating a wind turbine with the wind to produce electrical energy; synthesizing hydrogen gas from seawater utilizing the electrical energy from the wind turbine; storing the hydrogen gas in a storage system transported by the vessel; and offloading the hydrogen from the storage system.

A watercraft has a retractable lift-propulsion system including a mast connected to a buoyant body of the watercraft and movable between retracted and deployed positions. A distance between a distal end of the mast and a lower surface of the buoyant body is greater in the deployed position than in the retracted position. A lift-propulsion assembly includes a hydrofoil for providing lift to the watercraft at least in the deployed position of the mast and a propulsion unit for providing thrust to the watercraft in the retracted and deployed positions of the mast. The lift-propulsion assembly is connected to the distal end of the mast such that, in the deployed position of the mast, the lift-propulsion assembly is distanced from the buoyant body of the watercraft and, in the retracted position of the mast, the lift-propulsion assembly is proximate the buoyant body of the watercraft.

A sonar system is provided including a sonar assembly configured to attach to a motor assembly of a watercraft or a watercraft. The sonar assembly includes sonar transducer element(s) that transmit sonar beam(s). The sonar system includes a display, processor(s), and a steering assembly configured to cause rotation of the sonar assembly or the motor assembly. The sonar system includes a memory including computer program code that causes the processor(s) to cause the sonar transducer element(s) to emit sonar beam(s), receive sonar return data from a coverage volume of the sonar transducer element(s), generate a sonar image of the coverage volume based on the sonar return data, receive an input from a user, determine a target in the underwater environment based on the input, and cause the steering assembly to adjust the coverage volume to maintain the target within the coverage volume as the watercraft moves relative to the target.

Disclosed are a self-righting unmanned ship suitable for adverse sea conditions and a self-righting working mode thereof, belonging to the field of unmanned ship equipment and techniques. The unmanned ship comprises a main hull, a self-righting deck, an equipment and pipeline mast, a propeller, a radar, an air inlet and exhaust system, and a main engine system. Through the design of a watertight deck, the hull of the unmanned ship has a self-righting function, avoiding the possibility of the unmanned ship itself turning over, without installing additional self-righting equipment. Meanwhile, the internal structure and the self-righting working mode of the unmanned ship make it possible for the hull to automatically turn off the main engine and the air inlet and exhaust system when the heeling angle of the hull exceeds a certain angle, making the whole ship watertight.

An electrically-powered unmanned marine vehicle and method of making same, including providing a hull of the marine vehicle and mounting a submersible electric thruster to the hull via a mounting interface of the thruster. The thruster includes a stator assembly and a rotor assembly. The rotor assembly forms an internal cavity with a plurality of magnets arranged radially outwardly of the internal cavity. The stator assembly includes electrical windings that are disposed within the internal cavity of the rotor assembly. The thruster is configured to allow the internal cavity to be flooded with water when the thruster is submerged, and the electrical windings are encapsulated with a protective barrier that prevents the flooded water from contacting the windings. The thruster of the marine vehicle is thus water cooled, and the electromotive forces provided by the windings generate sufficient thrust to propel the marine vehicle through the water.