Your vessel's drafts are: FWD 17'-07", AFT...

Question 1 / 27070

Question 1 of 2707066636eec28f7522a1c51d11f

Your vessel's drafts are: FWD 17'-07", AFT 16'-09"; and the KG is 21.5 feet. Use the selected stability curves in the blue pages of the Stability Data Reference Book to determine the righting arm at 30° inclination.

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Question 1 of 27070

🔍 Key Concepts

• Using trim and mean draft to enter the correct stability curve in the Stability Data Reference Book • How KG (vertical center of gravity) shifts the GZ (righting arm) curve using the curves of statical stability • Reading the GZ value at a specific heel angle from the selected curve (here, 30°)

💭 Think About

• What is the mean draft of the vessel, and which draft range in the blue pages does that put you in? • Once you have the basic GZ curve for the correct draft, how do you adjust it for a KG of 21.5 ft using the stability data tables or diagrams? • After adjusting for KG, what is the GZ value at 30° on that curve, and which answer choice is closest to that value?

✅ Before You Answer

• Be sure you are using the correct displacement/draft curve that matches the vessel’s mean draft and trim condition • Verify you applied the correct KG correction (up or down) to the GZ curve based on the given KG of 21.5 ft • Double‑check that you are reading the GZ at exactly 30° from the adjusted curve, not from another angle such as 25° or 35°