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2. Dry deck shelter - Wikipedia

   en.wikipedia.org/wiki/Dry_Deck_Shelter

   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 ...

3. Boat building - Wikipedia

   en.wikipedia.org/wiki/Boat_building

   Boat building is the design and construction of boats (instead of the larger ships) — and their on-board systems. This includes at minimum the construction of a hull , with any necessary propulsion, mechanical, navigation, safety and other service systems as the craft requires.

4. Cunningham (sailing) - Wikipedia

   en.wikipedia.org/wiki/Cunningham_(sailing)

   The system usually consists of a line which is secured at one end to the mast or boom below the foot of the mainsail. It is then passed through a cringle in the luff of the sail near the foot but above the tack , and then led down on the other side to a fitting on the mast, boom or on deck .

5. Stuffing box - Wikipedia

   en.wikipedia.org/wiki/Stuffing_box

   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.

6. Ballast tank - Wikipedia

   en.wikipedia.org/wiki/Ballast_tank

   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 ...

7. Carvel (boat building) - Wikipedia

   en.wikipedia.org/wiki/Carvel_(boat_building)

   A comparison of clinker and carvel construction. Carvel frames are much heavier than clinker ribs.. Carvel built or carvel planking is a method of boat building in which hull planks are laid edge to edge and fastened to a robust frame, thereby forming a smooth surface.