A semisubmersible, 200 feet in length between draft marks with the LCF 10 feet aft of amidships, records the following drafts: Port Forward 64'-09"; Port Aft 68'-09"; Starboard Forward 59'-09"; and Starboard Aft 63'-09". What is the list?
• List vs trim – list is side-to-side, trim is fore-and-aft • Using average port draft and average starboard draft to find how far the vessel is heeled • Interpreting deeper draft side as the side of list
• First, find the mean draft on the port side using the two port readings, then the mean draft on the starboard side using the two starboard readings. How different are they? • Think about what the number in the answer choices represents in this problem: is it an angle in degrees, or a difference in draft between the two sides? • Look at which side (port or starboard) has the greater drafts. Which way must the vessel be heeled if that side is deeper in the water?
• Compute average port draft and average starboard draft accurately, keeping feet and inches consistent • Confirm which side has the greater average draft – that is the side the vessel is listed toward • Match the numerical difference between the two averages to the closest value in the answer choices
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