The DEEP DRILLER, at 60.0 feet draft in sea water, has VM = 974,441 foot-long tons, LM = 40,301 foot-long tons, TM = 3 foot-long tons, FSML = 30,572 foot-long tons, and FSMT = 18,732 foot-long tons. What is TCG?
• Relationship between transverse center of gravity (TCG) and transverse moments • How free surface moments (FSMT) affect the final transverse moment used for TCG • Using the vessel’s displacement at 60.0 ft draft from the hydrostatic data/stability booklet
• Ask yourself: how do you combine the given TM and FSMT values before dividing by the vessel’s weight (displacement)? • Think about whether VM or LM are actually needed to find TCG, or if you only need transverse quantities and displacement. • Consider what units TCG should be in, and check that your calculation keeps the units consistent (foot-long tons / long tons = feet).
• Verify the displacement (long tons) at 60.0 ft draft from the appropriate hydrostatic table or stability data for DEEP DRILLER. • Make sure you have formed the correct total transverse moment (including any free surface corrections) before dividing by displacement. • After calculation, confirm the sign and magnitude of your TCG make physical sense (a small lateral offset, not an unrealistically large one).
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