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2. Submarine hull - Wikipedia

   en.wikipedia.org/wiki/Submarine_hull

   Inside the outer hull there is a strong hull, or pressure hull, which withstands the outside pressure and has normal atmospheric pressure inside. The pressure hull is generally constructed of thick high-strength steel with a complex stiffening structure and high strength reserve, and is divided by watertight bulkheads into several compartments .

3. Greater Underwater Propulsion Power Program - Wikipedia

   en.wikipedia.org/wiki/Greater_Underwater...

   That analysis led [1] to four goals—increasing the submarines' battery capacity, streamlining the boats' structures, adding snorkels, and improving fire control systems. The navy immediately focused on designing a new class of submarine, but the Bureau of Ships believed the fleet of existing Gato , Balao , and Tench -class submarines could be ...

4. Sterndrive - Wikipedia

   en.wikipedia.org/wiki/Sterndrive

   The blower exchanges the air within the engine compartment with fresh outside air. Because of their practical advantages and attractive cost, sterndrives have become extremely popular especially for use in pleasure boats, and there are many models of boats for which sterndrive power is the only available propulsion offered.

5. How much does a boat cost to purchase and own? - AOL

   www.aol.com/finance/much-does-boat-cost-purchase...

   So, using the example above, the average annual cost of insurance for a $20,000 boat would be between $200 and $1,000 a year. Boat taxes: They are required in some states. If your state charges a ...

6. LED tube - Wikipedia

   en.wikipedia.org/wiki/LED_tube

   LED tubes. LED tube is a type of LED lamp used in fluorescent tube luminaires with G5 and G13 bases to replace traditional fluorescent tubes. [1] As compared to fluorescent tubes, the most important advantages of LED tubes are energy efficiency and long service life. LED tubes are sometimes also referred to as ‘LED fluorescent tubes’.

7. Seawolf-class submarine - Wikipedia

   en.wikipedia.org/wiki/Seawolf-class_submarine

   A fleet of 29 submarines was to be built over a ten-year period, but that was reduced to 12 submarines. The end of the Cold War and budget constraints led to the cancellation of any further additions to the fleet in 1995, leaving the Seawolf class limited to just three boats. This, in turn, led to the design of the smaller Virginia class.

8. List of ship directions - Wikipedia

   en.wikipedia.org/wiki/List_of_ship_directions

   Belowdecks: inside or into a ship, or down to a lower deck. [12] Bilge: the underwater part of a ship between the flat of the bottom and the vertical topsides [13] Bottom: the lowest part of the ship's hull. Bow: front of a ship (opposite of "stern") [1] Centerline or centreline: an imaginary, central line drawn from the bow to the stern. [1]

9. Carvel (boat building) - Wikipedia

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

   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. Traditionally the planks are neither attached to, nor slotted into, each other, having only a caulking sealant between the planks to keep water out.