The sailing drafts are: FWD 22'-06", AFT 23'-06" and the GM is 3.3 feet. Use the information in Section 1, the blue pages, of the Stability Data Reference Book, to determine the available righting arm at 22° inclination.
• Using the Stability Data Reference Book, Section 1 (blue pages) for righting arms • Relationship between GM, angle of heel, and GZ (righting arm) • How to interpolate between tabulated values in a stability table or curve
• First, identify which table or curve in the blue pages gives you information to find a righting arm at a specific angle when GM is known. What column or row should you be looking at for 22°? • Think about how GM affects the size of the righting arm. Are you using a direct GZ value from the table, or a base value that must be adjusted by GM or by sin(θ)? • If the exact angle or GM is not listed, how would you carefully interpolate between the nearest values to estimate the GZ at 22°?
• Verify you are using the correct section and table that corresponds to righting arms vs. angle, not a hydrostatic or loading table • Check that you are applying GM = 3.3 ft in the correct way – note whether the table assumes a standard GM or requires you to adjust GZ using GM or trig functions • Double-check your interpolation steps (between angles or GM values) and confirm the final GZ is in feet before comparing to the multiple-choice options
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