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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q104 - Deck Safety: Stability Problems
328. Your vessel has a displacement of 19,800 tons. It is 464 feet long, and has a beam of 64 feet. You have timed its rolling period to be 21.0 seconds in still water. What is your vessel's approximate GM?
The metacentric height (GM) can be approximated using the formula GM = (0.44 * B / T)2, where B is the beam and T is the rolling period. Substituting B = 64 feet and T = 21 seconds yields GM ≈ 1.8 feet.
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