Question 2639 Deck Safety

The correct answer is D) 4.6 feet. To determine the righting arm at 30° inclination, you need to refer to the stability curves in the blue pages of the Stability Data Reference Book. With the given drafts (FWD 22'-04", AFT 22'-10") and KG (18.4 feet), you can locate the appropriate stability curve and read the righting arm value at 30° inclination, which is 4.6 feet. The other options are incorrect because they do not match the value obtained from the stability curves for the given vessel characteristics. The stability curves are the authoritative source for determining the righting arm at a specific angle of inclination, and 4.6 feet is the correct value based on the information provided.