Your vessel is on an even keel. The MT1 of your vessel is 1000 ft-tons. How many tons of cargo must be loaded in number 4 hold which is 100 feet abaft the tipping center, if she is to have a 2 foot drag?
• MT1 (Moment to Trim 1 Foot) and how it relates weight, distance, and change of trim • The formula linking weight moved/added, its distance from the tipping center, and the resulting change of trim • The meaning of even keel and 2-foot drag (which end goes deeper?)
• Which formula connects MT1, the desired trim in feet, and the trimming moment created by the cargo weight? Write that down first. • Is the cargo being loaded forward or aft of the tipping center, and does that increase draft forward or aft? Relate that to the word ‘drag’. • After you set up your equation, solve for the unknown weight. Does the resulting weight seem reasonable compared with MT1 and the 100-foot lever arm?
• Make sure all distances are in feet and the trim is in feet, to match the units of MT1 (ft-tons). • Confirm you are using distance from the tipping center, not from the bow or stern, in your moment calculation. • Double-check that you apply the formula in the correct direction: Trimming Moment = MT1 × change of trim, and Trimming Moment = weight × distance.
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