The sailing drafts are: FWD 23'-10", AFT...

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Question 1 of 2066636eec28f7522a1c51cc4c

The sailing drafts are: FWD 23'-10", AFT 25'-02" and the GM is 5.3 feet. Use the information in Section 1, the blue pages, of the Stability Data Reference Book, to determine the available righting arm at 18° inclination.

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🔍 Key Concepts

• Stability Data Reference Book – Section 1 (Blue Pages): Understand how to use the KN (or GZ) curves and displacement tables for a given draft condition. • Effect of actual GM on righting arm: How to adjust from the reference GM in the book to the vessel’s actual GM to find the available righting arm at a specific angle. • Interpreting trim and displacement from drafts: Using forward and aft drafts to find mean draft, displacement, and the correct curve/table to enter.

💭 Think About

• From the given forward and aft drafts, how do you find the mean draft, and which table or curve in the blue pages does that send you to? • When you find the basic righting arm or KN value at 18°, does the book assume a standard GM, and if so, how do you correct that value for the vessel’s actual GM of 5.3 feet? • How does trim (different forward and aft drafts) affect which displacement/GM data you should use from the tables before reading the righting arm?

✅ Before You Answer

• Be sure you are entering the correct mean draft (and corresponding displacement) table for the actual drafts given, not a rounded or approximate load condition that looks close. • Verify whether the blue pages data is given as KN values with a reference KG/GM or as direct GZ (righting arm) values, and apply any required correction carefully. • Before choosing an answer, confirm that your final numerical value is a reasonable magnitude for GZ at 18° for a ship with GM ≈ 5.3 ft (not unrealistically small or large).

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