Abstract: A grounding skeg for a landing craft configured for stem landing onto, and setting off from, a ground surface, the grounding skeg including: an elongate grounding body having a fore end and an aft end; and a removable pulling propeller functionally connected to the fore end of the body; wherein the pulling propeller is able to drive the landing craft ahead and astern; and the grounding body is locatable on the landing craft such that; the grounding body provides contact with the ground surface during stem landing of the landing craft; the fore end of the grounding body faces a bow end of the landing craft; and the aft end of the grounding body faces a stem end of the landing craft.

Abstract: Axial Flux Outboard Propulsion System for an Electric Boat having a first axial flux motor that is positioned adjacent to a second axial flux motor and the ability to selectively turn each motor on or off via the control system based on the request or need for torque.

Abstract: An outboard motor has a top cowl and a service lid on the top cowl is movable into and between a closed position enclosing the powerhead compartment and an open position providing manual access to the powerhead compartment from above the outboard motor. An engine is in the powerhead compartment, wherein a peripheral gap is defined between the top cowl and the engine. A serviceable engine oil device is in the peripheral gap and is manually accessible from above the outboard motor when the service lid is in the open position. A serviceable transmission fluid device is in the peripheral gap and is manually accessible from above the outboard motor when the service lid is in the open position. A serviceable gearcase fluid device is in the peripheral gap and is manually accessible from above the outboard motor when the service lid is in the open position.

Abstract: A collapsible transom for an inflatable raft has a front section including two parallel front struts and a rear section including a floor portion and a collapsible support portion. The floor portion includes two parallel rear struts, and the two parallel front struts and two parallel rear struts are slidably connectable to each other by insertion into tubular end portions. The support portion is pivotally connected to the floor portion and movable between an expanded position with the support portion substantially parallel to and spaced away from the floor to a collapsed position with the support portion adjacent the floor.

Abstract: A power storage system for a marine vehicle is provided. The power storage system includes marine battery systems configured to provide energy to a marine vehicle load. Each marine battery system includes a battery and a three-position contactor configured to operate the marine battery system in one of a connected state, a disconnected state, or a bypass state. The power storage system further includes a controller coupled to each of the marine battery systems. The controller is configured to retrieve a preferred fault action for the marine battery systems, and in response to detection of a fault condition in the marine vehicle, control at least one three-position contactor of the marine battery systems according to the preferred fault action. The preferred fault action includes operating the marine battery system in the disconnected state or operating the marine battery system in the bypass state.

Abstract: A standing rigging element, in particular a mast of a vessel, that has a closed profile, and a method of manufacturing the standing rigging element. The halves of the closed profile are made of layers of structural textile saturated with an epoxy resin and have a shape corresponding to the shape of the standing rigging element, after gluing. The mast includes a layer of photovoltaic modules as one of the laminate layers, with a flat set of flexible photovoltaic cells on the outer surface. Cables collecting electricity from photovoltaic modules are routed from each photovoltaic module to common collecting cables, connected to the electric power supply installation of the vessel. The photovoltaic module includes layers of structural textile, wherein one of the layers is a layer of flexible photovoltaic cells.

Abstract: A steam-powered outboard conformal cooling system includes a steam turbine, a cooler and a conformal heat exchanger. The conformal heat exchanger includes a casing, a lower cap, an upper cap and multiple heat exchange tubes. The casing includes an outer shell plate provided outside a hull plate, the outer shell plate and the hull plate define a seawater heat exchange chamber. A first end of each of the heat exchange tubes is communicated with a cooling water intake chamber, a second end of the each of the heat exchange tubes is communicated with a cooling water discharge chamber, the cooling water intake chamber is communicated with the cooler through a water intake pipe, the cooling water discharge chamber is communicated with the cooler through a water discharge pipe.

Abstract: A boat hull having a ventilated boat keel is disclosed. In one embodiment, the ventilated boat keel may be a longitudinal vent tube from bow to stern, which runs down the center of the hull and branches off into multiple vent openings along the stepped hull. In another embodiment, the ventilated boat keel may be a longitudinal vent tube from bow to stern, which runs down the center of the hull and branches off into multiple vent openings along a traditional hull design. The ventilated boat keel creates a layer of micro-bubbles along the bottom of the boat. The micro-bubbles reduce friction and drag and allow for the boat to travel at a higher rate of speed using less fuel.

Abstract: A sonar device including a tow cable and a towed body elongate along a longitudinal axis from a first longitudinal end to a second longitudinal end. The towed body includes a plurality of electroacoustic transducers aligned along the longitudinal axis and is connected to the tow cable, so it is able, when it is towed and fully submerged, to be oriented along a vertical axis. At least one towed body is connected to the tow cable by a first hanger and a second hanger. First ends of the first and second hangers are connected to the tow cable and a second end of the first hanger is attached to the towed body at a first fixing point near the first longitudinal end and a second end of the second hanger is attached to the towed body at a second fixing point near the second longitudinal end.

Abstract: A buoyancy-adjustable swim training vest for a user has a polymer-neoprene fabric formed garment member designed to substantially circumscribe the user's torso from neck to waist. A lower front of the vest has a front cover coupled to the vest and is vertically liftable. A back portion has a right side and a left side elastic wing members extending from a lower back portion designed to wrap frontward around the user's torso and detachably couple by respective hook and loop assemblies to each other, the vest, and the front cover, all coupled beneath the cover. An at least one polymer strap may be coupled detachably and adjustably by a latch to a buckle disposed on a lower edge of the front of the vest. At least one substantially sealable back pocket is disposed on an outer surface of the lower back portion of the vest designed to hold removable buoyant pads.

Abstract: An embodiment of an exhaust collection system for collecting exhaust from a marine vessel includes an exhaust cleaning assembly including a tank. In addition, the exhaust collection system includes a vent hood in fluid communication with the tank of the exhaust cleaning assembly. The vent hood includes a frame including one or more extendable frame members, and an outer covering that covers the frame to define an enclosure with an opening configured to receive an exhaust stack of the marine vessel therethrough, the one or more extendable frame members to extend and retract to adjust a size of the opening.

Abstract: The present disclosure discloses a wingless hydraulic extrusion spiral rotation and forward movement type intelligent unmanned underwater vehicle, including a cabin body and a control module. The cabin body includes a power reaction cabin and a power fuel storage cabin, a power reaction cabin water supply device is fixedly arranged on the cabin body. The power reaction cabin and the power fuel storage cabin are separated by a partition plate. Power fuel in the power fuel storage cabin may enter the power reaction cabin. A tail part of the power reaction cabin is provided with a jet forward propeller. The control module is fixed on the cabin body. At least two jet rotation propellers are arranged on the cabin body. The jet rotation propeller includes a main propelling pipe, an auxiliary propelling pipe, and a jet magnification ring. The jet magnification ring includes an outer ring and an inner ring.

Abstract: An outboard motor includes an upper case located between an engine and a propulsion unit. The upper case includes case parts that are separate from each other and assembled together. The case parts include a first case part and a second case part opposing each other in a direction perpendicular or substantially perpendicular to an axis of a drive shaft.

Abstract: An outboard propulsion system comprising an engine configured to receive oil; an oil pan configured to receive oil from the engine; and an oil reservoir configured to receive oil from the oil pan and provide oil to the engine, in use.

Abstract: A water float includes a first part sheet, a middle part sheet, and a second part sheet. The three sheets are three parts of a single original sheet. The first part sheet and the second part sheet are respectively folded and sealingly connected to form a first and second inflatable floating chamber. The first inflatable floating chamber and the second inflatable floating chamber are configured to provide buoyancy in water, while the middle part sheet is configured to support user. When in use, fold and flip the first and second part sheet along centerline, stacking the first and second part sheet on top of each other, and then seal each edge of the first and second part sheet to form the sealed first and second inflatable floating chamber. A method for manufacturing a water float is also provided.

Abstract: Boat handling and control systems and methods related to one or more of steering and propulsion of a pontoon boat.

Abstract: An apparatus and methods for installation of an offshore platform for supporting equipment installations is provided. The apparatus includes a platform configured to support offshore equipment supported by a structure such as a modular column assembly. The modular column assembly can be comprised of main barrel joint bundles.

Abstract: Disclosed are a method and a device for reducing the wave-making resistance and friction force during ship navigation. The device includes a gas-liquid mixing device and a control device that are connected. The gas-liquid mixing device is provided with a water inlet, a gas inlet, a water outlet, and a gas-liquid mixing cavity arranged between the water inlet and the water outlet. Water and gas enter the gas-liquid mixing cavity via the water inlet and the gas inlet respectively, the control device controls gas intake at the gas inlet, and in this process, the water inlet is controlled to intermittently suspend water intake or intermittently implement low-speed water intake or implement continuous low-speed water intake, so that more gas enters the gas-liquid mixing cavity.

Abstract: A throwing protection apparatus for an adaptive navigation situation awareness device based on ship pilotage comprises: a connecting apparatus, a landing buffer apparatus, a fixing apparatus, a pressing apparatus, a shell and a control apparatus; wherein a bottom of the shell is provided with an opening for the adaptive navigation situation awareness device to pass through; one end of the connecting apparatus is fixedly connected to an unmanned aerial vehicle, and the other end of the connecting apparatus is slidably connected to the shell; the adaptive navigation situation awareness device is arranged in the shell and is fixed by the fixing apparatus arranged on the shell; the pressing apparatus is mounted on the shell and is positioned above the adaptive navigation situation awareness device; the landing buffer apparatus is mounted outside the shell; and an air bag and a distance measuring sensor are fixedly mounted on the shell.

Abstract: A reconfigurable wakesurf binding apparatus and system is provided. In certain embodiments, the wakesurf binding may comprise a top surface of a wakesurf board having a longitudinal axis, a first pair of female threaded inserts in the top surface aligned along a first axis angularly offset from the longitudinal axis of the wakesurf board by a first offset angle, a first strap having a first end comprising a first matrix of holes therethrough, a second end comprising a second matrix of holes therethrough, and a longitudinal axis, wherein the first strap is configured to be removably interconnected with the first pair of female threaded inserts with its longitudinal axis at an angle offset from the first axis, a second pair of female threaded inserts in the top surface aligned along the longitudinal axis of the wakesurf board.