The ratio of the underwater volume of a ship to the volume of a rectangular block with the same effective lengths, draft and beam

Related Terms


The vertical distance from the molded baseline to the top of the freeboard deck beam at side, measured at midlength of the ship


Block coefficient - a measure of the fullness of the form of the ship and is the ratio of the volume of displacement to a given water-line, and the volume of the circumscribing solid of constant rectangular cross-section having the same length, breadth and draught as the ship. CB= (L x B x T) The LPP is normally used in calculating the value of CB which varies with the type of ship. Fast ships Ordinary ships Slow ships 0.50-0.65 (fine form) 0.65-0.75 (moderate form) 0.75-0.85 (full form)


The largest vessel that can transit the locks of the St. Lawrence Seaway. Length is 226 meters (740 feet); Beam is 24 meters (78 feet); Draft is 7.92 meters (26 feet).


The largest size vessel that can traverse the Panama Canal. Current maximum dimensions are: Length 294.1 meters (965 feet); width 32.3 meters (106 feet); draft 12.0 meters (39.5 feet) in tropical fresh water; height 57.91 meters (190 feet) above the water.


  1. A length of wire or rope secured at one end to a mast or spar and having a block or other fitting at the lower end.
  2. A length of wire or rope hooked to a tackle on leeboards.
  3. A long, thin triangular flag flown from the masthead of a military ship (as opposed to a burgee, the flags thus flown on yachts).


  1. Short for WIRE DRAG. 2. The designed difference between the draft forward and aft when a vessel is down by the stern. 3. The retardation of a ship when in shallow water. 5. Short for ATMOSPHERIC DRAG


Any liquid or solid weight placed in a ship to change the trim, increase the draft, or to regulate the stability


The ratio of length of anchor rode in use to the vertical distance from the bow of the vessel to the bottom of the water. Usually six to seven to one for calm weather and more scope in storm conditions.


The length of a vessel along the waterline from the forward surface of the stem, or main bow perpendicular member, to the after surface of the sternpost, or main stern perpendicular member. Believed to give a reasonable idea of the vessel's carrying capacity, as it excludes the small, often unusable volume contained in her overhanging ends.


A ship constructed with upper deck extending throughout her entire length without a break or a superstructure, such as forecastle, bridge or poop

Related questions

MarineProHelp 2018 - 2019.