Your vessel's drafts are FWD 20'-08", AFT...

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Question 1 of 2066636eec28f7522a1c51d133

Your vessel's drafts are FWD 20'-08", AFT 23'-00". Use the information in Section 1, the blue pages, of the Stability Data Reference Book to determine the final drafts if 195 tons of cargo are discharged 76 feet aft of amidships.

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🔍 Key Concepts

• Trimming moment when weight is shifted or removed forward or aft • How to use tons per inch (TPI) and moment to change trim 1 inch (MCT 1 in) from the blue pages • Effect of discharging weight aft of amidships on forward and aft drafts

💭 Think About

• Is discharging weight aft of amidships similar to adding or removing a trimming moment by the stern or by the bow? Think about whether the stern will rise or sink when you remove weight aft. • First, find the change in trim using the discharge weight, its distance from amidships, and the vessel’s MCT 1 in. Then decide how much of that trim change affects the forward and aft drafts individually. • After finding the trim change, don’t forget that removing weight also affects the vessel’s mean draft. Consider how to use TPI to find the change in mean draft before applying trim corrections.

✅ Before You Answer

• From the blue pages, identify the correct TPI and MCT 1 in for the vessel’s displacement closest to your condition. • Carefully compute the trimming moment: (weight) × (distance from amidships). Confirm the units match the MCT 1 in table (foot-tons vs inch-tons). • When you apply the trim change, ensure that the sum of the forward and aft draft changes is consistent with both the change in mean draft and the total trim change.

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