Page 157 - statbility for masters and mates

Trim 145
Weight Distance from C.F. Moment to change trim by head stern
80 27 2160 ± 40 9 360±
2520 ±
Trim moment MCT 1cm
2520 120
21 cm by the head Ll Change of trim
47 21 100
Change of trim
Change of trim Change of draft aft
Change of draft aft Change of draft forward Change of draft forward
Originaldrafts4:300mA3:000mF
9:87 cm 53 21
Bodily sinkage 0:040 m 4:340 m Change due trim 0:099 m
0:040 m 3:040 m 0:111 m
100
11:13 cm
Ans:Newdrafts4:241mA3:151mF
Example 4
A ship of 6000 tonnes displacement has drafts 7 m F and 8 m A. MCT 1 cm 100 tonnes m, TPC 20 tonnes, centre of ¯otation is amidships. 500 tonnes of cargo is discharged from each of the following four holds:
No. 1 hold, centre of gravity 40 m forward of amidships No. 2 hold, centre of gravity 25 m forward of amidships No. 3 hold, centre of gravity 20 m aft of amidships
No. 4 hold, centre of gravity 50 m aft of amidships
Thefollowingbunkersarealsoloaded:
150tonnesat12mforwardofamidships 50tonnesat15maftofamidships
Findthenewdraftsforwardandaft.