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- Q133 - Deck Safety: Stability Problems
214. Your vessel measures 114 feet long by 16 feet in beam. If the natural rolling period at a draft of 5'- 06″ is 6 seconds, what is the GM?
The correct GM is calculated using the formula GM = (0.44 * Beam / Period)2. Substituting the given beam of 16 feet and rolling period of 6 seconds yields a GM of approximately 1.38 feet, which satisfies the rolling-period formula.
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