The SS AMERICAN MARINER is ready to sail...

Question 1 / 2066636eec28f7522a1c51cc1a

Question 1 of 2066636eec28f7522a1c51cc1a

The SS AMERICAN MARINER is ready to sail with the load shown in table ST-0081 below. Use the white pages of The Stability Data Reference Book to determine the available GM. Load 120 tons---145 feet fwd of amidships Discharge 160 tons---38 feet fwd of amidships Load 85 tons---35 feet aft of amidships Discharge 170 tons---205 feet aft of amidships

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🔍 Key Concepts

• GM (metacentric height) depends on ship’s displacement and vertical center of gravity (KG) – think about which parts of this problem actually change KG. • Longitudinal cargo movements mainly affect LCG and trim, not transverse stability, so separate trim effects from GM effects in your mind. • In the white pages for SS AMERICAN MARINER, the available GM is usually found from a table as a function of displacement and mean draft. Your cargo changes will alter the final displacement and mean draft.

💭 Think About

• First, compute the net change in displacement from all the loads and discharges. Is the ship finally heavier or lighter, and by how many tons? • Next, using each weight’s distance forward or aft of amidships, find the algebraic sum of longitudinal moments and determine the new LCG. How will that affect the ship’s trim and mean draft when you go to the hydrostatic tables? • When you look up hydrostatic data for the final condition in the white pages, which column(s) give you information that can be turned into an available GM, and do you need to apply any correction (like free surface) for this particular question?

✅ Before You Answer

• Be sure your sign convention is consistent: choose forward moments as positive (or negative) and keep it that way for all four weights. • Verify your final displacement matches one of the displacements (or requires interpolation) in the SS AMERICAN MARINER tables before reading off KM/GM-related values. • Double-check whether the question requires any free surface correction; if not mentioned, the available GM from the table may be used directly without further adjustment.

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Question 1 of 20

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Question 1 / 2066636eec28f7522a1c51cc1a

Question 1 of 2066636eec28f7522a1c51cc1a

Back

Question 1 of 20

66636eec28f7522a1c51cc1a

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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