Abstract: A motion damping system includes a tank compartmentalized to have a first compartment having a first opening, a second compartment having a second opening, and a third compartment disposed between the first and second compartments. The third compartment is in fluid communication with the first and second openings. A first piston is movably sealed within the first compartment and is in fluid communication with its first opening. A second piston is movably sealed within the second compartment and is in fluid communication with its second opening. A liquid fills the third compartment, a portion of the first compartment up to the first piston, and a portion of the second compartment up to the second piston. A coupling fixedly attached to the first and second pistons moves in correspondence with the first and second pistons. Motion damper(s) coupled to the coupling resist movements of the first and second pistons.

Abstract: Techniques are disclosed to enable a system for controlling the propulsion and steering of a boat by a boat operator. The boat has at least one propulsion and steering motor assembly connected to the boat with a propeller, and a propulsion motor. It also has left and right pivoting pedals to provide a signal that controls the angle of the propeller so that if the left pedal is pivoted in a first pivot direction by a first percentage and the right pedal is pivoted in a second pivot direction by a second percentage, the boat executes a turn, moves forward, or moves in reverse.

Abstract: A wave attenuator system for protecting a floating dock or other structure from incoming wake created by wind or vessel is disclosed herein, in various aspects. The wave attenuator system may include a substantially rectangular curtain made of a water-impermeable flexible material, in various aspects. The curtain top edge may be secured along the length of at least one of the sides of a dock, in various aspects. The curtain bottom edge may be suspended in a body of water a predetermined distance below the water surface, in various aspects. The bottom edge may include a weighted material to maintain the curtain in a substantially vertical orientation, in various aspects. The wave attenuator system is operable to redirect waves impacting the curtain downward to reduce wave action against the dock or other structure, in various aspects.

Abstract: Watercraft docking apparatus including a spreadable clamp attachable to a watercraft to be docked, an elongated pole attached at one end to the spreadable clamp, and structure attaching mechanism attached to an opposite end of the elongated pole. The spreadable clamp and the structure attaching mechanism are both designed to prevent lateral horizontal movement of the elongated pole.

Abstract: Disclosed is a floating island construction method for overall transplantation of sandy soil plants, the method comprising the following steps: separation from a surrounding soil body; construction of a buoyancy tank device (13); and waterproof construction, so as to construct a plant floating island from plants to be transplanted in a reservoir area. The floating island protects all the root systems of the plants and most of the undisturbed soil, improves the survival rate, preserves the unique landscape of an original habitat, and can be constructed at the same time as water conservancy project construction, which saves on the construction period, saves costs, and is convenient for on-site overall scheduling.

Abstract: The present invention discloses a wheel structure and a kayak using the same, relating to the field of ships.

Abstract: A pulley system for tying a boat to an anchor comprising a block and tackle assembly and a jammer. The block and tackle assembly has a plurality of pulleys arranged on a first bracket and a second bracket, and a first rope strung sequentially through each of the pulleys, ending with a last pulley. The jammer is coupled to the second bracket and has a channel and a jammer exit at the end of the channel. The last pulley, the channel, and the jammer exit are configured to create a tortuous path for the rope through the second bracket. The channel may be misaligned with the last pulley. A swivel and a rope clip may be coupled to the block and tackle assembly. The swivel is configured to rotate at least 360 in either direction. The rope clip is configured to allow for quick tightening of the pulley system.

Abstract: An inflatable watercraft of the kayak type including a hull including: a longitudinal bottom comprising a central longitudinal edge and two lateral longitudinal sides, so as to have a V-shaped cross section, the bottom comprising at least one inflatable shell, and a stiffening upper structure comprising two lateral longitudinal inflatable shells and at least one transverse element mounted between the two lateral inflatable shells, each lateral inflatable shell being mounted on one of the lateral longitudinal sides of the longitudinal bottom, in which each of the two lateral inflatable shells comprises two superimposed walls, each of said walls including a textile mat and being connected together by a multitude of connecting threads distributed over the entire surface of said mats while forming a structure suited to be inflated to a pressure capable of stiffening said structure.

Abstract: A directed thrust propulsion system has a central hub and at least three blades that extends outward at a rake angle between about 20 to 70 degrees. Each blade is shaped as a portion of a cylindrical surface, in which concave side forms the blade face and is facing in direction of thrust generated by rotating the hub. The convex side of the blades minimizes drag in the water that resists forward motion while the concave shape and tilted end portions directs the thrust inward toward the extension of the hub's principal axis rearward. The directed thrust propulsion system may be deployed on inboard and outboard motors for all manner of watercraft to increase efficiency above 10 knots speed.

Abstract: A hollow structural element of a wind energy plant, in particular an offshore wind energy plant which includes a hollow structural element, and a cable arrangement extending along the hollow structural element. A shading element is arranged on the hollow structural element at a distance from the cable arrangement.

Abstract: Offshore terminal apparatus which in various examples comprises a floating storage vessel which is spread-moored in fixed heading orientation to a seabed offshore by spread mooring lines, the floating storage vessel comprising a hull having bow and stern ends and which at either or both the bow end and the stern end is fitted with an extension section and includes coupling means on the extension section to couple spread mooring lines to the floating storage vessel.

Abstract: A seat assembly includes: a backrest having a cushion surface formed on a first side of the backrest and support surface formed on a second side of the backrest; a first track assembly located along a first side of the backrest and a second track assembly located along a second side of the backrest; and a plurality of guide pins extending from the backrest into the first track assembly and the second track assembly such that the backrest is movable along the first track assembly and the second track assembly on the plurality of guide pins between a stowed position and a deployed position.

Abstract: Systems and methods to provide an exterior stringer system inflatable paddleboard. The exterior stringer system inflatable paddleboard maintains the benefits of a baseline inflatable paddleboard while providing increased strength, such as increased rigidity or stiffness. The exterior stringer system is positioned on the bottom surface of a baseline inflatable paddleboard. In one embodiment, the exterior stringer system is formed by a set of longitudinal stringers positioned on opposite sides of an inflatable paddleboard and a set of transverse stringers arranged in an X configuration between the longitudinal stringers.

Abstract: A battery enclosure for a personal watercraft is provided. Different configurations of the battery enclosure are disclosed, as well as different arrangements of the battery enclosure within the personal watercraft and with respect to other features of the personal watercraft. According to one embodiment, a personal watercraft includes a deck and a hull defining an interior volume. An electric motor is housed within the interior volume, the electric motor being operable to rotate a drive shaft. A battery pack having a battery enclosure housing one or more batteries is also positioned within the interior volume. A portion of at least one battery of the one or more batteries is positioned vertically above the drive shaft.

Abstract: An assembly for a watercraft according to an example of the present disclosure includes, among other things, a flotation device including an elongated slot and a mount that has first and second flanges extending outwardly from a bracket body. The first flange is configured to be mechanically attached to a frame, and the second flange is slideably received in the slot to secure the flotation device. A method of assembly for a watercraft is also disclosed.

Abstract: A boat in which at least a portion of at least one of the port side and the starboard side of the hull is moveable between a first position and a second position. In the first position the moveable portion forms a generally upright portion of the port or starboard side of the hull, and, in the second position, the moveable portion forms a generally horizontal deck surface. A walkway connects a seating area within the boat to an area aft of the seating area, and at least a portion of the walkway is adjacent to the moveable portion of the port or starboard side. A first seat is positioned adjacent to at least a portion of the walkway and a removable seat is configured to be positioned over the walkway and adjacent to the first seat.

Abstract: In one example, a watercraft includes a hull that defines a well extending through a bottom of the hull, and the hull defines an upper tray recess and a lower tray recess. A pedal-drive mechanism is connected to the hull and configured to assume both a stowed position and a deployed position, and a portion of the pedal-drive mechanism extends through the well when the pedal-drive mechanism is in the deployed position. A pedal-drive housing and attachment mechanism is provided that includes a tray configured to move between a forward position in which part of the tray resides in the lower tray recess, and an aft position in which part of the tray resides in the upper tray recess.

Abstract: Methods and systems for operating a stable platform in a far-offshore deep-sea environment. The platform can advantageously be a wind power generation station. A structural framework carries (for example) the wind turbine in an elevated position. Multiple points on the floating structure are connected both to a surface float and to a deep mass (e.g. an enclosed volume of seawater).

Abstract: A floating vessel comprising: (a) opposing hulls; (b) a beam extending between and interconnecting the opposing hulls; and (c) a deck supported by the beam and positioned between the opposing hulls, wherein the floating vessel is modular and configured for easy assembly, disassembly, or both.

Abstract: A pontoon boat includes port and starboard pontoons and cross members connecting the pontoons. A shock absorber may be installed at each point of connection of the pontoons to the cross members. A cross member may be embodied as a double-webbed beam having first and second parallel flanges and first and second webs disposed between and connected to the flanges. Each pontoon may include a two-stage lifting strake having a first surface and a second surface inclined from the first surface.