[kach22i]

Military
Boats for Beginners

http://www.globalsecurity.org/military/systems/ship/beginner.htm

The floors of a ship are called decks, the walls are called bulkheads, and the stairs are called ladders. There are no halls or corridors in a ship, only passageways. There are no ceilings in a room, only the overhead in the compartment. Openings in the outside of the ship are ports, not windows. Entrances from one compartment to another are called doors. Openings from one deck to another are called hatches. The handles on the watertight hatch or door are called dogs.

When you close a door or watertight hatch, you secure it. If you close down the dogs on the door or hatch, you dog it down. You never scrub the floor or wash the walls, rather you swab the deck and scrub the bulkheads. When you get up to go to work, turn to. You never go downstairs, you lay below, and if you are going up from one deck to another, you lay topside. If you are going up the mast or into the rigging you are going aloft.....................

Theory shows that at high Froude numbers, the transverse portion of the Kelvin wave is virtually eliminated, reducing the wave resistance to low Froude number values. This leads to the idea that to significantly reduce wave resistance, a ship should operate at large Froude numbers, thereby surpassing the limiting hump. The idea is analogous to a supersonic jet overcoming wind resistance by surpassing the sound barrier.

Click the link to read more:
http://www.globalsecurity.org/military/systems/ship/beginner.