The DEEP DRILLER, loaded as shown in the Sample Load Form #4 (Drilling), discharges a non-liquid load of 275.8 long tons from a position 130 feet above the keel, 40 feet forward of amidships, and 30 feet to port of the centerline. What is the new GML?
• Effect of removing a weight on center of gravity (G) and metacentric height (GM) • How to compute moment to change GM (or KG) using long tons and vertical distances • Relationship between GML and KG/GM when longitudinal particulars are given in a load form
• First, think about whether discharging a high, off-center weight will make GM (and thus GML) increase or decrease. Why? • From the sample load form, identify the original displacement, KG, GM, and GML. How does removing this weight change the ship’s displacement and KG? • After finding the new KG and new GM, how would you obtain the new GML shown on the load form?
• Confirm the original displacement (Δ) and original KG/GM/GML from Sample Load Form #4 before doing any math • Use the correct sign when calculating the moment of the removed weight (removing a weight is the opposite of adding it) • Check that your units are consistent: long tons, feet, and tons‑feet for moments, and that you divide by the new displacement after discharge
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