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Ship Stability
Dr. Arwa Hussein
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GZ = arm of stability
Righting moment = W * GZ
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B
K
W G
B
GM = KB +BM -KG
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KG = center of gravity of ship
KB = center of buoyancy of under
water part BM = Metacentric Radius
GM = Metacentric hieght
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Inclining Experiment
to determine KG
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Heeling moment = weight * distance
= w * d
Righting moment= displacement * GM *
From pendulum
tan =a/l
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GM = (w * d) /( * )
= a/l
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For each there is corresponding GZ
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Free surface effect
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Suspended Weight Effect
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End of Lecture
