Your sailing drafts are: FWD 14'-04", AFT 16'-02" and the GM is 3.0 feet. What will be the angle of list if #5 port double bottom (capacity 195 tons, VCG 2.6 feet, and 18.5 feet off the centerline) is filled with saltwater? (Use the data in Section 1, the blue pages, of the Stability Data Reference Book)
• Transverse statical stability and the relationship between GM (metacentric height), displacement, and list angle • How adding a weight off the centerline creates a transverse shift of G (center of gravity) using the formula involving weight, distance off centerline, total displacement, and GM • Using the vessel’s displacement and moment to change trim/list data from Section 1 (blue pages) of the Stability Data Reference Book
• First, determine the ship’s displacement from the draft condition given and confirm it from the blue pages before any list is applied • Calculate the transverse shift of G caused by filling #5 port double bottom using the weight, its transverse distance (off centerline), and the ship’s displacement • Use the relationship between the transverse shift of G, GM, and the tangent of the list angle to find the closest answer choice
• From the blue pages, confirm the displacement that corresponds to the given drafts before filling the tank • Verify that you are using saltwater density for the tank weight and not confusing it with fuel or freshwater data • Ensure the final angle is in degrees, and that you use tan(θ) (not sin or cos) when converting the G-shift/GM ratio to an angle
No comments yet
Be the first to share your thoughts!