Your vessel's drafts are: FWD 18'-03", AFT 18'-09"; and the KG is 22.6 feet. Use the selected stability curves in the blue pages of the Stability Data Reference Book to determine the angle of list if the center of gravity is shifted 1.4 feet off the centerline.
• Use of stability curves (GZ curves) in the Stability Data Reference Book blue pages • Relationship between KG, GM, GZ, and list angle when G is off the centerline • Formula relating transverse shift of G to list angle using the ship’s GM and displacement
• First, think about how to find the metacentric height GM from the given KG and the curves/tables in the book. What must you look up or interpolate? • Once you know GM, how does a 1.4 ft transverse shift of G create a list? Which stability relationship connects G shift, GM, and tan(list angle)? • After you estimate the list angle from the formula, how can you cross-check it against the stability (GZ) curve for that loading condition to see which multiple-choice angle is most consistent?
• Confirm you are using the correct displacement / draft condition on the blue-page stability curves that matches FWD and AFT drafts given. • Verify you have correctly determined GM = KM − KG from the data (do not skip finding KM for this draft). • Before picking an answer, check whether your calculated list angle is closer to the lower or higher of the nearby options when rounded to the nearest degree.
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