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- Q131 - Deck Safety: Stability Problems
202. Your vessel displaces 930 tons and measures 156'L by 38'B. What is the reduction in GM due to free surface if the fish hold (46'L by 28'B by 8'D) is filled with 1.5 feet of water? (Each foot of water weighs 36.8 tons)
The reduction in GM due to free surface is calculated using the formula GG0 = ρI/Δ, where ρ is the liquid density, I is the second moment of area of the free surface (LB3/12), and Δ is the vessel's displacement. With the given tank dimensions and water density, the calculation yields a GM reduction of approximately 2.44 feet.
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