🔍 Key Concepts

• Use the white pages for SS AMERICAN MARINER to find each tank’s LCG from the Forward Perpendicular (FP) and corresponding moment or volume for the actual loading condition in table ST-0137. • Remember that the LCG of a combined liquid load is found from the sum of longitudinal moments divided by the total weight (or volume) of liquid. • For port and starboard tanks listed together (e.g., DB 2 P / DB 2 S), note that their LCGs are the same; you must include both in the total moment and total weight.

💭 Think About

• For each tank shown in the exam’s loading table, what two numbers do you need from the white pages to build that tank’s longitudinal moment about FP? • Once you have all individual tank moments, how do you combine them to get one overall LCG for the entire liquid load? Write the formula before you calculate. • How does including or omitting any one tank (for example, a centerline vs. a P/S pair) change the total moment and therefore move the final LCG forward or aft? Which direction would an additional forward tank shift the overall LCG?

✅ Before You Answer

• Verify that you are only using tanks that are actually containing liquid in table ST-0137 (ignore any empty tanks). • For each tank, double‑check that you used the LCG from FP, not the transverse CG or a sounding/ullage value. • After computing (LCG = \frac{\sum(W \times LCG)}{\sum W}), confirm that the final LCG is reasonable relative to the ship’s length (i.e., not unrealistically far forward or aft compared to where most loaded tanks lie).