Page 332 - statbility for masters and mates

320 Ship Stability for Masters and Mates
gravity of the weight is equal to d cos y.
; w dEcos y W GZ
The length GZ, although not a righting lever in this case can be found using the `Wall-sided' formula.
i.e.
If Then
or
Example
GZ GM 12 EBMEtan2 y sin y
; w dEcos y WEsin y GM 12 EBMEtan2 y
GM 0 w dEcosy WEsinyE12 BMEtan2y
w d sin y E 12 EBMEtan2 y W cosy
2EwEd tan3 y BMEW
r
tany 3 2EwEd BMEW
A ship of 12250 tonnes displacement, has KM 8m, KB 3.8m, KG 8m and is ¯oating upright. Find the list if a weight of 2 tonnes, already on board, is shifted transversely through a horizontal distance of 12 m, assuming that the ship is wall-sided.
The ship has zero GM
KM 8:0m
KB 3:8m BM 4:2m
r
; tan list 3 2EwEd WEBM
r
tan list 3 2E2E12 0:0977 12250 4:2
Ans. List 5 340