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- Q122 - Deck Safety: Stability Problems
186. Your vessel displaces 747 tons and measures 136'L by 34'B. You ship a large wave on the after deck. What is the reduction to GM due to free surface before the water drains overboard, if the after deck measures 56'L x 34'B and the weight of the water is 58.6 tons?
The reduction in GM due to free surface is calculated as the free-surface moment of inertia divided by the ship's total volume displacement, which includes the weight of the shipped water. Using the given dimensions and weights, the calculation yields a reduction of 6.51 feet.
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