Search results
Results from the WOW.Com Content Network
Lightweight displacement – LWD – The weight or mass of the ship excluding cargo, fuel, ballast, stores, passengers, and crew, but with water in the boilers to steaming level. Loadline displacement – The weight or mass of the ship loaded to the load line or plimsoll mark. Deadweight tonnage (DWT) is a measure of how much weight a ship can ...
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
The bow (/ b aʊ /) is the forward part of the hull of a ship or boat, [1] the point that is usually most forward when the vessel is underway. The aft end of the boat is the stern. [2] Prow may be used as a synonym for bow or it may mean the forward-most part of the bow above the waterline.
Graphical representation of the dimensions used to describe a ship. Length between perpendiculars (often abbreviated as p/p, p.p., pp, LPP, LBP or Length BPP) is the length of a ship along the summer load line from the forward surface of the stem, or main bow perpendicular member, to the after surface of the sternpost, or main stern perpendicular member.
Bow wave of a canal barge. A bow wave is the wave that forms at the bow of a ship when it moves through the water. [1] As the bow wave spreads out, it defines the outer limits of a ship's wake. A large bow wave slows the ship down, is a risk to smaller boats, and in a harbor can damage shore facilities and moored ships.
These works are all in the public domain. Roger Morris, Hydrographer from 1985 to 1990, published Charts and Surveys in Peace and War 1919-1970, a further continuation of Memoirs. [8] A less formal account of British Naval Hydrography in the 19th-Century is given by Steve Ritchie, Hydrographer 1966–1971, in The Admiralty Chart. [5]
The position of the summer load line is calculated from the load line rules and depends on many factors such as length of ship, type of ship, type and number of superstructures, amount of sheer, and bow height. The horizontal line through the circle of the Plimsoll mark is at the same level as the summer load line.
Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well. When hull speed is exceeded, a vessel in displacement mode ...