Page 354 - Practical Ship Design

Freeboard and Subdivision 31 1

where
S, = actual sheer forward
Sa, = actual sheer aft
S, = standard sheer forward
S,, = standard sheer aft
The correction for sheer is:
Additiorddeduction = defylexcess [0.75 - S/2L]
where S = length of superstructure.
There are some detailed rules about the measurement of the actual sheer and in
relation to variations from the standard profile.

-~
~~~
Ship No. Freeboard Date
~ Dimensions 1 B D Cb

~~
Standard Freeboard (SF)
Hatchcovers correction
Depth correction = [D - U15] R IfD>U15i,ifD~U15-
Cb correction = SFx(C, - 0.68)/1.36 + if C, > 0.68
Erections correction = x
Sheer correction = + Def x[0.75 - S/2L] + def: - excess
_ Bow __ height correction -
Total deductions
Freeboard

Moulded depth D - m m Actual sheer F
Stringer/sheathing m Actual sheer A
1 --
1 Freeboard depth m
I Freeboard m
r_____ - ~- -
Moulded depth m
Keel _
Full draft _~_

Standard freeboard type A
Standard freeboard type B
A-B
60% (A-6)
Standard
~- freeboard 6-60 1 1
-
Fig. I 1, I. Freeboard calculation table.