🔍 Key Concepts

• Use of the Stability Data Reference Book (white pages) for SS AMERICAN MARINER trim problems • How adding weight forward affects mean draft and trim (change in forward vs aft drafts) • Relationship between TPI (tons per inch immersion) and MTI/MT1 (moment to change trim) when loading weight at the ends

💭 Think About

• First, think about what happens to the ship’s overall mean draft when you add 100.7 tons of seawater anywhere on board. Should the mean draft increase or decrease, and by about how much? • Next, consider that this weight is added all the way forward in the forepeak. How will that affect the trim: will the ship go more by the head or more by the stern, and which end should show a larger draft change? • Compare the choices: which ones show a realistic combination of increased mean draft plus the correct direction and magnitude of trim change based on the MTI/MT1 data in the white pages?

✅ Before You Answer

• From the white pages, identify the correct TPI at the starting mean draft and use it to estimate the change in mean draft due to 100.7 tons. • From the white pages, find the MTI/MT1 at the starting draft and the LCF (longitudinal center of flotation), then compute the change in trim caused by putting 100.7 tons in the forepeak (using the distance from LCF). • Verify that the forward and aft drafts you calculate are consistent with: (1) the new mean draft you found, and (2) the direction of trim you expect when adding weight forward.