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 KGL?
• KG vs. KGL – understand what the ship’s vertical center of gravity is before and after loading/discharging cargo • Effect of removing weight – how discharging a weight at a known KG changes the ship’s overall KG • Use of the displacement from the Sample Load Form to compute a new KGL
• From the Sample Load Form #4, what is the vessel’s displacement and original KGL before this weight is discharged? • When you remove a weight high above the keel, does the ship’s overall KG go up or down? By a small amount or a large amount compared to that height? • Is the correction to KG found by using a simple weighted-average formula based on the weight removed, its KG, and the ship’s displacement?
• Be sure you are using long tons for both the cargo weight and the ship’s displacement (same units). • Confirm you are using the vertical height above keel (130 ft) only for the KG calculation, not the longitudinal or transverse distances. • After computing the new KGL, check that it is slightly lower than the original (since a high weight was removed) and matches the order of magnitude of the answer choices.
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