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- Q137 - Deck Safety
1077. You are making a heavy lift with the jumbo boom. Your vessel displaces 18,000 T. The 50-ton weight is on the pier, and its center is 75 feet to starboard of the centerline. The head of the boom is 112 feet above the base line, and the center of gravity of the lift when stowed on deck will be 56 feet above the base line. As the jumbo boom takes the strain, the ship lists 3.5°. What is the GM when the cargo is stowed?
The ship lists due to an off-center load, requiring calculation of initial GM using the equilibrium equation. Lowering the load from suspension increases GM, and accounting for the vertical shift of the ship's center of gravity results in a final GM of 3.56 feet.
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