Your sailing drafts are: FWD 19'-06", AFT 20'-10" and the GM is 3.3 feet. What will be the angle of list if the #2 starboard deep tank (capacity 100 tons, VCG 19.1 feet, and 24 feet off the centerline) is filled? (Use the data in Section 1, the blue pages, of the Stability Data Reference Book)
• Transverse shift of center of gravity when adding an off-center weight • Relationship between GM (metacentric height), GZ (righting arm), and angle of list for small angles • Using the stability data book to find or confirm the ship’s displacement and existing KG/GM before adding weights
• How does adding a weight off the centerline change the ship’s center of gravity horizontally, and how is that related to the angle of list? • For small angles, how can you relate the heeling arm (caused by the off-center weight) to the righting arm (depending on GM and the sine of the angle)? • What key values from the stability data reference (displacement, existing KG/GM, tank corrections) must you determine before calculating the list angle?
• Be sure you know the vessel’s displacement for the given drafts from the stability data book before you start any heel calculation. • Confirm you’re using the correct formula for small-angle list: the heeling moment equals the righting moment at equilibrium. • Double-check units: verify that weight (tons), transverse distance (feet), and GM (feet) are used consistently when computing the angle.
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