🔍 Key Concepts
• Use the white pages for the SS AMERICAN MARINER liquid tanks to find the vertical center of gravity (KG) for each specific tank listed (DB and DT tanks).
• Remember the combined KG of several weights is found from the total moments divided by total weight: \( KG_{total} = \frac{\sum (w_i \times KG_i)}{\sum w_i} \).
• Be sure you are using the correct column in the tank tables (KG/VCG above baseline) for the fill condition that matches the listed quantities.
💭 Think About
• For each tank in the table (DB 1 CL, DB 1A CL, DB 2 P, etc.), what two pieces of information do you need from the Stability Data Reference Book to compute its moment about the keel?
• Once you have the individual tank moments, how do you combine them to get one overall KG for the entire liquid load?
• Are any tanks paired port and starboard, and if so, does that affect KG or only transverse moments? How does that simplify your work for this question?
✅ Before You Answer
• Confirm that the numbers in the question’s table (e.g., 48.2, 81.9, 71.2, etc.) are weights in tons for each tank, not KG values themselves.
• For each tank, verify you are using the correct KG/VCG value for that exact tank and loading condition from the white pages (do not mix up DB and DT tank tables).
• After summing all tank weights and moments, double-check your final computation of \( KG_{total} = \frac{\text{Total Moment}}{\text{Total Weight}} \) and see which answer choice is closest to that result.