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Clump weights for bells and stages:– A clump weight is a large ballast weight suspended from a cable which runs down from one side of the launch and recovery gantry, through a pair of sheaves on the sides of the weight, and up the other side back to the gantry, where it is fastened. The weight hangs freely between the two parts of the cable ...
The advantage of water ballast is that the tanks can be emptied, reducing draft or the weight of the boat (e.g. for transport on ground) and water added back in (in small boats, simply by opening up the valves and letting the water flow in) after the boat is launched or cargo unloaded.
The ballast is 7,000 lb (3,200 kg), either lead and iron (earlier boats) or all lead, installed inside the keel (which is part of the hull shape) and set in resin. [ 8 ] The trade-off for the construction strength is weight; at 19,500 lb (8,800 kg), the Westsail is exceptionally heavy for a 32-foot (9.8 m) boat.
Cross section of a vessel with a single ballast tank at the bottom. A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural ...
The purpose of the bulb keel is to place the ballast as low as possible, therefore gaining the maximum possible amount of leverage and thus the most righting moment. An example of a class of boats that use a bulb keel is the International 110 racing class, which uses a 300 lb (136 kg) cast iron bulb keel on a boat whose minimum racing weight is ...
Diagram of the position of a centerboard on a boat Also centerplate (American spelling), centreplate (British spelling). A wooden board or metal plate which can be pivoted through a fore-and-aft slot along the centerline in the hull of a sailing vessel, functioning as a retractable keel to help the boat resist leeway by moving its center of ...
Sail components include the features that define a sail's shape and function, plus its constituent parts from which it is manufactured. A sail may be classified in a variety of ways, including by its orientation to the vessel (e.g. fore-and-aft) and its shape, (e.g. (a)symmetrical, triangular, quadrilateral, etc.).
A truss spar comprises three parts, a short-height, large-diameter cylindrical hull, atop a truss structure, atop tanks for heavy ballast. A cell spar consists of a cluster of small-diameter cylinders and relatively speaking, cheap to manufacture. Cylinders are either buoyancy only, or subdivided into buoyancy and ballast.