The draft of the SS AMERICAN MARINER cannot...

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Question 1 of 2066636eec28f7522a1c51c211

The draft of the SS AMERICAN MARINER cannot exceed 23'-06" in order to cross a bar. The present drafts are: FWD 22'-03", AFT 24'-00". Use the white pages of the Stability Data Reference Book to determine the minimum amount of sea water to ballast the forepeak to achieve this condition.

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Question 1 of 20

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🔍 Key Concepts

• Using the white pages trim tables for SS AMERICAN MARINER (Stability Data Reference Book) • Relationship between added weight forward, trim, and resulting aft draft • Using trimming moment per inch/centimeter (MTI/MT1) and the lever arm from LCF to the forepeak

💭 Think About

• Start by figuring out how much the aft draft must change to meet the maximum allowed draft over the bar. How many inches/feet of draft change at the stern are required? • From the white pages, work out the trimming moment needed to get that change in aft draft. Then connect that trimming moment to a weight placed in the forepeak using the distance from LCF to the forepeak. • Consider how adding ballast in the forepeak affects both mean draft and trim. Does the aft draft go up or down when trimming by the head?

✅ Before You Answer

• Verify the required change in aft draft (from present aft draft to the limiting 23'-06") in inches, since tables are often per inch or per centimeter. • Use the correct MTI/MT1 value from the white pages for the ship’s current displacement or nearest condition. • Double‑check the distance (lever arm) from the Longitudinal Center of Flotation (LCF) to the forepeak compartment used for ballast, since this directly affects the weight you calculate.

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