Hull coefficients
Posted: Thu Nov 04, 2004 1:26 pm
Some concepts of interest:
1) The block coefficient (CB) is the ratio of the underwater hull volume of a ship at a particular draft to the volume of a rectangular prism (the circumscribing prism) of the same length, breadth, and draught as the ship.
CB = V/(L x B x T)
2) The midship section coefficient (CM) is the ratio of the area of the underwater midship section (Am) of a ship at a particular draft to the area of a rectangle (the circumscribing rectangle) of the same breadth and draught as the ship.
CM = Am/(B x T)
3) The waterplane coefficient (CWP) is the ratio of the area of a ship’s waterplane (AWP) to the area of a rectangle (the circumscribing rectangle) of the same length and breadth as the ship.
CWP = AWP/(L x B)
4) The longitudinal prismatic coefficient (CP) is the ratio of the underwater hull volume of a ship to the volume of a prism with length equal to the ship's and cross-section area identical to the midship section. In other words, the prismatic coefficient is equal to the block coefficient (CB) divided by the midship section coefficient (CM).
CP = V/(Am x L) = CB/CM
1) The block coefficient (CB) is the ratio of the underwater hull volume of a ship at a particular draft to the volume of a rectangular prism (the circumscribing prism) of the same length, breadth, and draught as the ship.
CB = V/(L x B x T)
2) The midship section coefficient (CM) is the ratio of the area of the underwater midship section (Am) of a ship at a particular draft to the area of a rectangle (the circumscribing rectangle) of the same breadth and draught as the ship.
CM = Am/(B x T)
3) The waterplane coefficient (CWP) is the ratio of the area of a ship’s waterplane (AWP) to the area of a rectangle (the circumscribing rectangle) of the same length and breadth as the ship.
CWP = AWP/(L x B)
4) The longitudinal prismatic coefficient (CP) is the ratio of the underwater hull volume of a ship to the volume of a prism with length equal to the ship's and cross-section area identical to the midship section. In other words, the prismatic coefficient is equal to the block coefficient (CB) divided by the midship section coefficient (CM).
CP = V/(Am x L) = CB/CM