The SS AMERICAN MARINER will sail with the load shown in table ST-0084 below. Use the white pages of The Stability Data Reference Book to determine the drafts.
• Use the white pages hydrostatic tables for SS AMERICAN MARINER to get displacement, TPI (tons per inch immersion), and LCF for the final condition. • Compute the combined LCG (longitudinal center of gravity) from the table ST-0084 by summing moments = tons × LCG-FP and dividing by total tons. • Relate the distance between LCG and LCF to the vessel’s trim and then convert trim in inches to forward and aft drafts using the MT1" (moment to change trim one inch).
• First, what is the total deadweight from table ST-0084, and what is the resulting combined LCG from these loads? • From the light-ship plus deadweight displacement, what mean draft does the hydrostatic table show, and what MT1" and LCF correspond to that displacement? • Is the LCG forward or aft of the LCF, and therefore will the ship trim by the bow or by the stern, and by how many inches at each end?
• Be sure you include all weights in ST-0084 and use the correct LCG-FP sign convention (all are forward of FP here). • Verify that you are using the correct displacement row in the hydrostatic tables that matches your total displacement, interpolating if needed. • After computing trim, check that your final drafts are consistent with the sign of trim (bow deeper if trimming by the head, stern deeper if trimming by the stern) before selecting an answer.
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