Question 2661 Deck Safety

The correct answer is C) 25,520 foot-tons. To calculate the righting moment at 30 degrees of heel, we need to use the formula provided in Section 1 (the blue pages) of the Stability Data Reference Book: Righting Moment = Displacement x GZ, where GZ is the righting arm at 30 degrees of heel. Using the given vessel information (draft forward 22'-03", draft aft 22'-09", and KG 23.2 feet), we can look up the corresponding GZ value at 30 degrees of heel, which is 1.16 feet. Multiplying the displacement (based on the drafts) by the GZ value gives us the correct righting moment of 25,520 foot-tons. The other answer choices are incorrect because they do not match the calculated righting moment using the provided formula and vessel data.