Your drafts are: FWD 6'-01", AFT 6'-10". From past experience, you know that the vessel will increase her draft 1 inch for every 6 tons loaded. There is rig water on board and 11 tons of deck cargo. How many more tons of cargo can be loaded and still maintain the same trim? See illustration D037DG below.
• Maximum draft limits in the stability letter (forward and aft) and what "trim should be minimized" implies • Effect of loading additional weight when tons per inch immersion (TPI) is known and trim is kept the same (parallel sinkage) • Deck cargo limits when rig water is carried versus when it is not
• If the vessel sinks bodily with the same trim, will the forward and aft drafts each increase by the same amount or different amounts? Which end will reach its allowed maximum draft first? • Using the given drafts and the letter’s maximum allowed drafts, how many inches of sinkage are available at the bow and at the stern? Convert the limiting sinkage into tons using the given 1 inch per 6 tons. • With rig water already on board and 11 tons of deck cargo, what is the maximum deck cargo permitted by the letter, and how does that compare with the amount limited by the drafts?
• Carefully read item 2 in the illustration for the exact maximum forward and aft drafts allowed. • Carefully read item 4 in the illustration for the deck cargo limit when rig water is carried. • Before choosing an answer, confirm which restriction is tighter: the draft limit (using TPI) or the deck cargo limit (35 tons with rig water).
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