Your vessel's drafts are: FWD 23'-10", AFT...

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Question 1 of 2066636eec28f7522a1c51d143

Your vessel's drafts are: FWD 23'-10", AFT 26'-00". The LCG of the forepeak is 200 feet forward of amidships. How many tons of ballast must be pumped into the forepeak in order to have a drag of 18 inches? (Use the reference material in Section 1, the blue pages, of the Stability Data Reference Book)

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Question 1 of 20

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🔍 Key Concepts

• Trim and draft change due to moving weights (using the trim tables in the Stability Data Reference Book) • Relationship between LCG of added weight, LCF (Longitudinal Center of Flotation), and resulting change in trim • Converting desired drag in inches into a required difference in drafts and then into a moment to change trim (MCT)

💭 Think About

• First, convert the desired drag to the required change in forward and/or aft drafts. What will the new forward and aft drafts be relative to the present condition? • From the blue pages, identify the correct MCT 1 inch (or 1 cm) and LCF for the vessel’s present displacement. How do these values help you connect the weight added in the forepeak to the change in trim? • Think about the lever arm: what is the distance between the LCG of the added ballast (forepeak) and the LCF, and how does that distance factor into the trimming moment you need to produce the desired drag?

✅ Before You Answer

• Be sure you use the correct displacement and corresponding MCT value from the tables for the vessel’s current condition. • Confirm you are measuring the distance from LCF to the LCG of the forepeak, not from amidships, when computing the trimming moment. • Double‑check unit consistency: inches vs feet for trim, and tons-feet (or equivalent) for moments, before selecting the final tonnage option.

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