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- Q122 - Deck Safety: Stability Problems
217. Your vessel measures 122 feet long by 18 feet in beam. If the natural rolling period at a draft of 6'-09″ is 5 seconds, what is the GM?
Metacentric height (GM) is calculated using the formula GM = (0.44B/T)2, where B is the beam and T is the rolling period. Substituting B = 18 feet and T = 5 seconds yields GM ≈ 2.5 feet.
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