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- Q131 - Deck Safety: Stability Problems
233. Your vessel measures 125 feet long by 17 feet in beam. If the natural rolling period at a draft of 7'- 09″ is 6 seconds, what is the GM?
The metacentric height (GM) is calculated using the formula GM = (0.44 * B / T)2, where B is the beam and T is the rolling period. Substituting B = 17 feet and T = 6 seconds yields GM ≈ 1.55 feet.
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