Using the information in Section 1, the blue pages, of the Stability Data Reference Book, determine the danger angle for permanent list if the KG is 21.8 feet and the drafts are: FWD 19'-05", AFT 20'-01".
• KG and GM relationship and how a higher KG affects stability • How to use the Stability Data Reference Book, Section 1 (blue pages) tables to find danger angles for permanent list • Effect of actual displacement from drafts on the danger angle value
• From the given drafts, what is the ship’s approximate displacement, and which displacement row in the blue pages table should you be using? • Once you select the proper displacement (based on drafts), how do you locate the column for a KG of 21.8 ft, or the nearest KG values that bracket 21.8? • If 21.8 ft falls between two KG values, what is the proper way to estimate the corresponding danger angle from the table?
• Make sure you are using Section 1 (blue pages) specifically labeled for danger angle for permanent list, not a different stability table • Confirm you are using the correct displacement row that matches the drafts given (use the Load Line/Displacement table in the blue pages as needed) • If interpolation is needed between two KG values, verify your interpolated angle lies between the angles listed for those KG values and trends in the correct direction (higher KG → smaller danger angle)
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