🔍 Key Concepts

• Using the vessel’s TPC/TPI (tons per centimeter or inch immersion) from the loading manual to find the change in mean draft when weight is added • Using MCT 1" (moment to change trim 1 inch) and the longitudinal position of No. 18 hatch to find the change in trim • Figuring out how a change in mean draft and a change in trim combine to give new forward and aft drafts

💭 Think About

• First, ignore trim and figure out how much the mean draft will change when 540 LT are added using the TPI/TPC from the Grand Haven manual at the starting draft • Next, decide whether No. 18 hatch is forward or aft of the LCF/LCB and how that will affect trim (will the bow go down, the stern go down, or will trim be nearly unchanged?) • Use MCT 1" (or equivalent data in the manual) and the distance of No. 18 hatch from the LCF to estimate how many inches of trim change occur, then split that trim change between the forward and aft drafts

✅ Before You Answer

• Verify the correct TPI/TPC at the vessel’s starting mean draft (do not assume it is constant at all drafts) • Confirm the longitudinal position of No. 18 hatch relative to midships/LCF from the Grand Haven loading manual • After calculating, check that the total displacement increase equals 540 LT and that the new forward and aft drafts are consistent with the direction of trim (the deeper end should match where the weight was placed)