Your vessel's drafts are FWD 24'-09", AFT 27'-01". Use the information in Section 1, the blue pages, of the Stability Data Reference Book to determine the final drafts if 122 tons are discharged 76 feet aft of amidships, 128 tons are discharged 54 feet forward of amidships, and 68 tons of fuel is pumped 48 feet aft.
• Trimming moment = weight moved × distance from amidships • Relationship between change in trim and the vessel’s MT1" (moment to change trim 1 inch) from the Stability Data Reference Book • How a stern trim vs bow trim affects forward and aft drafts
• Figure out for each weight whether its removal or movement creates a trimming moment by the bow or by the stern relative to amidships • Combine all trimming moments to get a single net trimming moment, then divide by MT1" to find the total change in trim in inches • Decide which end (bow or stern) becomes shallower and how much of the trim change applies to the forward draft and how much to the aft draft
• From Section 1 of the Stability Data Reference Book, be sure you are using the correct displacement and MT1" for the vessel’s starting condition • Check the sign of each trimming moment carefully: is it trimming the vessel by the bow or by the stern? • After you compute the new drafts, confirm that the sum of forward and aft drafts/2 is consistent with the expected mean draft after losing the given weights (overall draft should decrease).
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