Your sailing drafts are: FWD 21'-08", AFT 22'-04" and the GM is 3.2 feet. What will be the angle of list if the #6 port deep tank (capacity 201 tons, VCG 11.4 feet, and 25.5 feet off the centerline) is filled? (Use the data in Section 1, the blue pages, of the Stability Data Reference Book)
• Transverse GM (metacentric height) and its role in calculating angle of list • Free surface/weight shift formula for list: using moment = weight × transverse distance / (displacement × GM) • Using the vessel’s displacement and hydrostatic data from Section 1 (blue pages) based on the given drafts
• From the given drafts, what is the ship’s approximate displacement and existing GM from the Stability Data Reference Book? • How do you compute the heeling moment created when filling the #6 port deep tank, using its weight and distance off centerline? • Once you have the heeling moment, how is the angle of list in radians (or degrees) related to that moment and the ship’s displacement and GM?
• Make sure you’re using the correct displacement and KM/GM that correspond to the actual mean draft from the given fore and aft drafts • Confirm you treat the 201 tons as an added off-center weight, not just a vertical shift • Before choosing, check if your computed angle in degrees is closest to 2°, 4°, 6°, or 8° and that it is a reasonable, small-angle result (usually using tan θ ≈ θ in radians)
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