Page 329 - statbility for masters and mates

Let
Effect of change of density on draft and trim 317
MBS Mean Bodily Sinkage SW higher density; FW lower density
MBS W rSW rFW TPCSW rFW
gLgBdr r r MBS SW SW FW
gL gB r rFW 100 SW
; MBS d rSW rFW 100 rFW
MBS 3 0:025 100 0:075 m 1:000
; MBS 0:075 m Original mean draft 3:000 m
New mean draft 3:075 m say draft d2
(c) Find the Change of Trim
Let B1B2 be the horizontal component of the shift of the centre of buoyancy. Then
B1B2 v d V
10:8 2 442:8
; B1B2 0:0487 m Trimming Moment W B1B2
W LBdSW rSW
36 4 3 1:025
; W 442:8 tonnes
36 4 3 1:025 t 0:0487 m 21:56 t m 1:000
BML 2 L2 12d 2
362
12 3:075
36 m 35:12m 1:025
MCTC ' W BML 100 L
442:8 35:12 100 36
4:32 tonnes metres Change of Trim Trimming Moment
MCTC
21:56 5cm 4:32