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Two scuppers cut into either side of this outdoor stairwell prevent water from building up and making the stairs slippery. A scupper is an opening in the side walls of a vessel or an open-air structure, which allows water to drain instead of pooling within the bulwark or gunwales of a vessel, or within the curbing or walls of a building. Ship's ...
The grey area indicates the deck of the boat. A dorade box (also called a dorade vent , collector box , cowl vent , or simply a "ventilator") is a type of vent that permits the passage of air in and out of the cabin or engine room of a boat while keeping rain, spray, and sea wash out.
Water that does not drain off the side of the deck or through a hole in the hull, which it would typically do via a scupper, instead drains down into the ship into the bilge. This water may be from rough seas, rain, leaks in the hull or stuffing box, or other interior spillage. The collected water must be pumped out to prevent the bilge from ...
A hull is the watertight body of a ship, boat, submarine, or flying boat. The hull may open at the top (such as a dinghy ), or it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructures , such as a funnel, derrick, or mast .
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
Such a hull has a maximum "hull speed" which is a function of its waterline length. An exception is the catamaran, whose twin hulls are usually so fine that they do not engender a bow wave. Planing hulls: planing hulls have a shape that allows the boat to rise out of the water as the speed increases. Sail boats that plane are typical V-shaped ...
The stuffing box prevents water from entering the boat's hull. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull. The "box" is a cylindrical assembly, typically of bronze, comprising a sleeve threaded on one end to accept adjusting and locking nuts. A special purpose heavy ...
Oval in shape and very similar to half a walnut shell, the coracle has a keel-less flat bottom to evenly spread the load across the structure and to reduce the required depth of water; often to only a few inches. This structure helps to make the boat more maneuverable and less likely to snag when used on narrow and/or shallow slow-running ...