The sailing drafts are: FWD 22'-08", AFT...

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Question 1 of 2066636eec28f7522a1c51cc4a

The sailing drafts are: FWD 22'-08", AFT 23'-04" and the GM is 4.6 feet. Use the information in Section 1, the blue pages, of the Stability Data Reference Book, to determine the available righting arm at 20° inclination.

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🔍 Key Concepts

• Stability Data Reference Book – Section 1 (blue pages) for determining GZ (righting arm) at a given displacement and GM • Relationship between GM (metacentric height) and GZ at small to moderate angles • How trim (different forward and aft drafts) affects which displacement/curves you should use

💭 Think About

• First, from the given forward and aft drafts, what is the ship’s mean draft, and from that, what is the displacement you should enter with in Section 1? • Once you’ve identified the correct displacement page/curve, how do you use the given GM = 4.6 ft to obtain or adjust the righting arm (GZ) at 20°? • When you read or interpolate the GZ at 20°, how can you check if your answer is reasonable for a vessel with GM around 4.6 ft (too small, too big, or about right)?

✅ Before You Answer

• Confirm you are on the correct displacement curve/page for the mean draft derived from FWD and AFT drafts. • Verify whether the blue pages give GZ directly at 20° for that displacement/GM, or if you must interpolate between two curves or tabulated values. • Double-check units and angle: ensure you are reading feet (not meters) and the 20° line, not a nearby angle such as 15° or 25°.

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