Use the material in Section 1, the blue...

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Question 1 of 2066636eec28f7522a1c51d031

Use the material in Section 1, the blue pages, of the Stability Data Reference Book. If the KG is 22.0 feet, and the drafts are: FWD 23'-06", AFT 24'-03"; at what angle will the vessel lose positive stability?

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🔍 Key Concepts

• Using the cross curves of stability (blue pages) to find the relation between displacement, KG, and angle of heel • How KN values are corrected for a given KG to obtain righting arms (GZ) • Identifying the angle where GZ becomes zero, indicating loss of positive stability

💭 Think About

• From the given drafts, what is the vessel’s displacement, and which cross-curve page should you be on? • Once you know the displacement, how do you use the KN curve and the given KG to find GZ at various angles? • What does it mean physically and on the graph when the vessel loses positive stability, and how is that shown on the GZ curve?

✅ Before You Answer

• Be sure you are using the correct displacement line and not just the draft values directly on the KN curves • Verify that you are applying the KG correction to the KN values correctly (GZ = KN − KG·sinθ, or as specified in your reference book) • Carefully identify the first angle at which the corrected GZ value becomes zero or negative, as that is where positive stability is lost

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