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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q104 - Deck Safety: Stability Problems
339. Your vessel displaces 562 tons and measures 121'L x 29'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 46'L x 29'B and the weight of the water is 41 tons?
The reduction in GM due to free surface is calculated by dividing the transverse second moment of area of the free surface by the total displacement, which includes the weight of the shipped water. Using the given dimensions and weights, the GM reduction is 4.43 feet.
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