Page 155 - statbility for masters and mates

Original drafts Bodily sinkage
Change due trim Ans: New drafts
5:000 m A 0:450 m
5:450 m 0:281 m
5:169 m A
4:500 m F 0:450 m 4:950 m 0:300 m
5:250 m F
Trim 143
Note. In the event of more than one weight being loaded or discharged, the net weight loaded or discharged is used to ®nd the net bodily increase or decrease in draft, and the resultant trimming moment is used to ®nd the change of trim.
Also, when the net weight loaded or discharged is large, it may be necessary to use the TPC and MCT 1 cm at the original draft to ®nd the approximate new drafts, and then rework the problem using the TPC and MCT 1 cm for the mean of the old and the new drafts to ®nd a more accurate result.
Example 2
A box-shaped vessel 40 m 6 m 3 m is ¯oating in salt water on an even keel at 2 m draft F and A. Find the new drafts if a weight of 35 tonnes is discharged from a position 6 m from forward. MCT 1 cm 8.4 tonnes m.
TPC WPA 97:56
40 6 97:56
TPC 2:46 tonnes
e Fig. 15.7
Bodily rise w TPC
35 2:46
Bodily rise 14:2 cm Changeoftrim w d
MCT 1cm 35 14
8:4