🔍 Key Concepts

• Use Sheet 2 – Hydrostatic Data for SS AMERICAN MARINER: find the correct displacement, TPI (tons per inch immersion), LCF (longitudinal center of flotation), and MT1 (moment to change trim 1 inch) for the initial mean draft. • Separate the problem into change of mean draft (total weight loaded) and change of trim (algebraic sum of trimming moments about midships or LCF). • Remember the sign convention: weights forward of LCF tend to trim the ship by the head, and weights aft of LCF tend to trim by the stern.

💭 Think About

• First, compute the total weight loaded and use the appropriate TPI at the starting mean draft to find the change in mean draft. How does that affect both forward and aft drafts equally? • Next, calculate the trimming moment of each weight about the LCF (or about midships then correct to LCF using its position). What is the net trimming moment, and does it trim by the head or stern? • After you find the total change in trim, use the fore‑and‑aft draft correction formula to split that trim between the forward and aft drafts. Which answer choice best matches those corrected drafts?.

✅ Before You Answer

• Be sure you are using the correct row on Sheet 2 that matches the initial mean draft (average of the given FWD and AFT drafts). • Double‑check your lever arms: convert the distances in the table (feet forward/aft of amidships) to moments about the LCF, not just amidships, using the LCF’s position from Sheet 2. • Before picking an option, confirm that the direction of trim (more draft forward or aft) in your result matches the physical expectation from the locations of the loaded weights.