Page 153 - statbility for masters and mates

W L B d 1:025 90 10 3 1:025
W 2767:5 tonnes
MCT 1 cm W GML
MCT 1 cm ' W BML 100L
2767:5 225 100 90
Trim 141
100L Since BG is small compared with GML:
MCT 1 cm 69:19 tonnes m/cm Changeoftrim w d
MCT 1cm 64 40
69:19
Change of trim 37 cm by the stern
Change of draft aft Ll Change of trim
12 37 cm Change of draft aft 18:5 cm Change of draft forward 18:5 cm.
Original drafts Change due to trim Ans: New drafts
3:000 m A 0:185 m
3:185 m A
3:000 m F 0:185 m
2:815 m F
The effect of loading and/or discharging weights
When a weight is loaded at the centre of ¯otation it will produce no trimming moment, but the ship's drafts will increase uniformly so that the ship displaces an extra weight of water equal to the weight loaded. If the weight is now shifted forward or aft away from the centre of ¯otation, it will cause a change of trim. From this it can be seen that when a weight is loaded away from the centre of ¯otation, it will cause both a bodily sinkage and a change of trim.