A sealing arrangement is used when mounting a thruster in a well box attached to a hull of a marine vessel. The well box has an axis, a bottom flange, a top flange, an annular wall therebetween and hoisting pipes fastened parallel with the axis to the bottom flange radially outside the annular wall. Both the well box and a mounting flange have at least one surface acting as a sealing surface between the well box and the thruster. At least one of the surfaces has a groove for a seal for preventing water from entering the well box. The well box has a rotationally symmetric wall with an internal guide surface and the mounting flange of the thruster has an axially extending rotationally symmetric part provided with an outer surface having means for sealing the mounting flange in relation to the well box.

A system and process is provided to deplete or remove moisture from wood coring in boats by piercing 20 a fiberglass outer skin; forming 30 bores or holes 200 in wood coring to form an exposed portion; processing ambient air 35 to create processed air; pumping or displacing 40 processed air into the bores or holes 200; penetrating 50 an exposed portion 80; with a sealant 100; and filling 60 the exposed portion 80 with a sealant 100.

There is described a hinge for detachably connecting a door or window to a wall or a frame such as a windshield. The hinge comprising a shaft extending longitudinally, further comprising a blocker which is extendable about the shaft. A first socketed member is fixed to the shaft, and a second socketed member comprises a lumen for sliding the shaft therein. The lumen comprises a cavity larger than a remainder of the lumen and which defines an inward edge on which the blocker abuts, thereby retaining the shaft in the lumen. The shaft comprises an inner recess which can house the blocker therein if the inner recess is aligned with the blocker, thereby retracting the blocker from the cavity and releasing the shaft from the second socketed member and allowing the first socketed member and the second socketed member to be separated. This can be useful for detaching a door of a boat windshield, for example.

Disclosed are an moving apparatus and a method of performing work to an interior of a hull block. The moving apparatus according to an exemplary embodiment of the present invention includes a guide rail configured to guide a working robot, a moving means driving unit configured to move the moving apparatus, and a storage battery configured to supply electricity to the moving means driving unit.

An electrolytic protection system for stern drive marine motors having a cavitation plae, said system comprising an adaptors fixedly secured to said cavitation plate, and an anode mateable with said adopter.

A method for installing a gantry tower crane for use in cargo tank checking is provided. By using this method, a tower crane can be installed rapidly since tower units are lowered when assembling the tower units, the time required to install two prefabricated towers can be reduced, and all zones of the cargo tanks can be checked as baskets, and pedestrian overpasses can be installed.

Disclosed are a propulsion system for a ship, a method of assembling the same, and a method of disassembling the same. The propulsion system for the ship includes: a rear propeller fixed to a rotary shaft; a front propeller that is rotatably supported on the rotary shaft in front of the rear propeller; a contra-rotating device that is mounted in an installation space at a rear end of a hull so as to reverse the rotation of the rotary shaft and transmit the reversed rotation to the front propeller; a propeller connecting member that connects the contra-rotating device and the front propeller to transmit a rotational force; and a thrust supporting device that is provided between the contra-rotating device and the propeller connection member to support thrust of the front propeller.

A cleat having an adjustable anchoring system configured to suspend a bumper. The cleat has a first horn located opposite a second horn. A support structure is connected to the cleat. A recess of the support structure has a ridge protruding from a wall surface of the recess. The ridge is configured to deform a portion of rope. A bore of the support structure is configured to receive a fastener. A base has a bore configured to receive the fastener. The bore of the support structure is oriented to align with the bore of the base. The base has two ramps that protrude from a wall surface of a recess of the base. The two ramps form a pocket that can have a protrusion configured to bind a portion of the rope when the fastener is tightened.

A portable, inflatable, waterproof tool to lift installed marine outdrives from incompatible immersion when not in operation. The deflated tool designed and constructed to be compatible with the craft's hull shape and positioned with the backing fabric against the hull is slipped under the craft's hull cross section adjacent to the outdrive and secured by two D-Rings that provide purchase capability. Inflation is provided by a pressurization device. Inflation is applied until the desired lift is achieved. Deflation is achieved by venting the fill valve and pulling the deflated tool to the desired side of the craft. The deflated tool is stored in the storage container.

A method for disassembling and/or assembling an underwater section of a retractable thruster unit of a swimming vessel. A supporting cradle is detachably fixed to the underwater section from below, and the thruster unit is lifted so that the underwater section is at least partly brought inside the well formed in the bottom of the vessel. Lifting wires of an auxiliary lift are connected to the supporting cradle for supporting the thruster unit. Water is drained from the well, and the lower gear is disengaged and the intermediate section and the lower gear are sealed. After that water is let to ingress into the well and the underwater section is lowered down by the auxiliary lift to dock bottom or sea bed, from where the underwater section is picked up with a crane.