Page 93 - Practical Ship Design

The Design Equutions 63

0.8 L
/ I 1
I ,
- Bulk carriers
0 I 1 Q
-
0.7 - -. 0 A &-e*
Cap Tankers -- X
vol - A- I 1
>F
0.6 - Container ships
- +-
-
0.5 1 1,1111 I -

Cargo capacity
Fig. 3.5. versus cargo capacity.
Total hull volume

basis. Unfortunately, some of the available data is based on C,l at 0.80 so it has
been necessary to use this in some places.
It can be quite useful to express C,l as a multiple of Cb which can be done by
converting eq. (3.10) as follows:

Taking an average value of T/D = 0.70, this reduces to

which gives the values at D and 0.80, respectively, shown in Fig 3.6.

3.2.2 Choosing between eqs. (3.7) and (3.8)

The calculation of V, using eq. (3.7) requires a lot of work as it is necessary to put
reasonably accurate figures on all the many items included in V,. Its use is necessary
for passenger ships and for ships with a variety of different spaces in addition to their
main cargo capacity. The calculation of V, in this way is dealt with in Chapter 5.