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When the service opening is not in use, it is sealed by a removable cover plate, commonly referred to as a Butterworth cover. [4] Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up ...
A subdivision of the sheet plywood boat building method is known as the stitch-and-glue method, [8] where pre-shaped panels of plywood are drawn together then edge glued and reinforced with fibreglass without the use of a frame. [9] Metal or plastic ties, nylon fishing line or copper wires pull curved flat panels into three-dimensional curved ...
A dry deck shelter (DDS) is a removable module that can be attached to a submarine to allow divers easy exit and entrance while the boat is submerged. The host submarine must be specially modified to accommodate the DDS, with the appropriate mating hatch configuration, electrical connections, and piping for ventilation, [ 1 ] divers' air, and ...
MacGregor steel hatch cover Robert MacGregor was a British engineer , who, during the 1920s, concerned over unnecessary losses of North Sea colliers , developed the first steel hatch cover. The design was simple and consisted of five articulated leaves that stowed neatly at the end of each hatch.
It usually consists of a raised section of deck plating around an opening, such as a cargo hatch. Coamings also provide a frame onto which to fit a hatch cover. The protective metal sheeting or plating protecting against water entry into ventilation shafts in large ships is called a coaming as it fulfills the same water-deflection purpose.
Spiling is a technique used in building wooden boats in which a smaller component is used as a pattern against which the outline of a larger component can be drawn. This is often used for creating planks on traditionally built boats that have complex shapes.
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