A semisubmersible displacing 18,000 long tons has an LCG 2 feet forward of amidships. Bulk, weighing 400 long tons, is discharged from P-tanks located 50.8 feet aft of amidships. What is the new LCG?
Official USCG Answer & Rule Citation
Correct Answer: Option D — 3.20 feet forward of amidships
Longitudinal center of gravity (LCG) shift is found using moments: (weight removed * distance from initial LCG) / new displacement. Discharging weight aft causes the LCG to move forward of amidships to 3.20 feet based on standard moment calculations.
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