The sailing drafts are: FWD 25'-03", AFT...

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Question 1 of 2066636eec28f7522a1c51cc4f

The sailing drafts are: FWD 25'-03", AFT 26'-03" and the GM is 3.5 feet. Use the information in Section 1, the blue pages, of the Stability Data Reference Book, to determine the available righting arm at 25° inclination.

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🔍 Key Concepts

• Using initial GM to approximate the righting arm (GZ) at small angles of heel • Reading and interpolating values from Stability Data Reference Book, Section 1 (blue pages) for given drafts • Relationship between displacement, KN curves, and GZ (GZ = KN - KG·sinθ)

💭 Think About

• Given the drafts, what is your approximate displacement from the blue pages, and which KN curve or table applies at 25°? • How do you use the given GM (or KG derived from it) together with the tabulated KN value at 25° to obtain GZ at 25°? • Are you working within the range of angles where the GM-based approximation is valid, or should you rely directly on the books tabulated values?

✅ Before You Answer

• Be sure you are using the correct hydrostatic page for the given mean draft (average of FWD and AFT) • Double‑check that you are applying the correct trig function (sin 25°) and not mixing degrees and radians if you use a calculator • Verify whether the book gives you KN or GZ directly at 25° for that displacement, and adjust for KG or GM only if needed

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