Page 85 - Practical Ship Design
P. 85
Chapter 3
The Design Equations
3.1 THE WEIGHT EQUATIONS
The dimensions of a ship whose design is weight based are determined by the
following equations.
A = r . C, . L . B . T . ( 1 + s) (3.1)
and either
A = W, + W, (3.2)
or
A= W,IK, (3.3)
where
r = specific gravity of the liquid in which the ship is intended to float
= 1 .OOO for fresh water
= 1.025 generally for salt water
L = length BP or length WL in metres
B = breadth mld. in metres
T = load draft mld. in metres
C, = moulded block coefficient at draft Ton length L
A = full displacement in tonnes
s = displacement of shell, stern and appendages expressed as a fraction
of the moulded displacement
W, = full deadweight in tonnes
W, = light ship weight in tonnes
Kd = deadweight/displacement ratio Wd lA
