The SS AMERICAN MARINER has on board 3885 tons of cargo with an LCG-FP of 278.45 feet. See table ST-0168 below for the distribution of the cargo to be loaded. Use the white pages of The Stability Data Reference Book to determine the final LCG-FP of the cargo. No. 1 Main Deck...............................90 No. 1 Second Deck........................100 No. 2 Second Deck........................160 No. 2 Third Deck............................130 No. 3 Second Deck........................180 No. 3 Tank Top...............................380 No. 4 Tank Top...............................320 No. 5 Second Deck........................160 No. 5 26'-6" Flat P/S REEFER.......110 No. 5 Tank Top...............................360 No. 6 Second Deck........................110 No. 7 Second Deck........................120 No. 7 Third Deck............................140
• Use the LCG of each compartment from the white pages of the Stability Data Reference Book, not the numbers shown in the problem statement • Compute total moments by multiplying each new cargo weight by its compartment LCG and adding to the existing cargo moment (3885 tons at LCG-FP 278.45 ft) • Find the final LCG-FP by dividing the sum of all moments by the sum of all cargo weights
• Are the numbers (90, 100, 160, etc.) representing weights or longitudinal positions, and where do you find the missing values you still need? • Once you add this new cargo, should the ship’s overall LCG move forward or aft compared with 278.45 ft, based on where most of the added weight is placed? • When you calculate the combined LCG, does your answer fall within a small range suggested by your estimate of how far the center of gravity should shift?
• Confirm the total added cargo weight by summing all the given weights in ST-0168 • Use the correct LCG-FP for each hold/deck from the white pages (watch for similarly named spaces such as No. 5 Second Deck vs. No. 5 Tank Top) • Before choosing an option, recalculate the overall LCG = (ΣW·LCG)/(ΣW) and check that it moves in the expected direction from 278.45 ft
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