Block Coefficient is the ratio of the actual volume of the underwater shape and a volume of a rectangular block, having the same extreme length, breath, and depth.
The Coefficient is expressed as a decimal and varies from about .5 in the case of five lined yachts, gradually increasing through .6 to .75 in the case of fast passenger steamers and to .85 for slow, bluff, cargo type of vessels.
The Volume of Displacement is the quantity of water required to fill the molded shape of the hole left by a ship, if she were lifted out of the medium in which
she floats.It should be noted that the Ship’s Displacement maybe expressed in either terms of ton weight, or measured capacity in cubic foot.
And it should be noted also that Salt and Fresh water are different to each other; and we can float more easily in Salt Water (sea, ocean) compare to Fresh Water (swimming pool, river)
The Formulas to find Ship or Vessel Displacement in either Sea Water or Fresh Water:
Sea Water Displacement Formula:
1. Displacement (Tons) = L x B x D x C / 35
2. Displacement (Cubic Foot) = L x B x D x C / 0.9912
Fresh Water Displacement Formula:
1. Displacement (Tons) = L x B x D x C / 36
2. Displacement (Cubic Foot) = L x B x D x C / 1.01952
Click the link to see some examples regarding problems and solving: http://expertscolumn.com/content/seamanship-ship-or-vessel-displacement-problems-and-solving-regarding-block-coefficient
Where:
L stands for Length of the Ship
B stands for Breadth of the Ship
D stands for Depth or Drop of the Ship
C stands for Block Coefficient
x = symbolizes as times or multiplied by
/ = symbolizes as divided by
35 = constant for body object found in Salt Water (tons)
36 = constant for body object found in Fresh Water (tons)
0.9912 = constant for body object found in Salt Water (measured capacity in cubic foot)
1.01952 = constant for body object found in Fresh Water (measured capacity in cubic foot)
