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Dynamical stability 221
Fig. 22.3
h 10
h 10 radians common interval CI
57:3
The area under the stability curve 13 CI S1
1 10 3:53 3 57:3
0:2053 metre-radians
Dynamical stability W Area under the stability curve
5000 0:2053 Ans. Dynamical stability 1026.5 metre tonnes
Example 2
A box-shaped vessel 45m 10m 6m is ¯oating in salt water at a draft of 4 m F and A. GM 0:6 m. Calculate the dynamical stability to 20 degrees
heel.
BM B2
12d
10 10
12 4 BM 2:08 m
Displacement 45 10 4 1:025 tonnes Displacement 1845 tonnes
Note. When calculating the GZ's 10 degrees may be considered a small angle of heel, but 20 degrees is a large angle of heel, and therefore, the wall-sided formula must be used to ®nd the GZ.
GZ SM Products for area
010 0.104 4 0.416 0.252 1 0.252
0:668 S1