The SS AMERICAN MARINER arrived in port with...

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Question 1 of 2066636eec28f7522a1c51cb65

The SS AMERICAN MARINER arrived in port with drafts of: FWD 21'-09.5", AFT 22'-09.5". Cargo was loaded and discharged as indicated in table ST-0087 below. Use sheet 2 in the white pages of The Stability Data Reference Book to determine the final drafts.

Load 170 tons--120 ft fwd of amidships Discharge 100 tons--28 ft fwd of amidships Discharge 70 tons--122 ft aft of amidships Load 200 tons--163 ft aft of amidships

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Question 1 of 20

66636eec28f7522a1c51cb65

Load 170 tons--120 ft fwd of amidships Discharge 100 tons--28 ft fwd of amidships Discharge 70 tons--122 ft aft of amidships Load 200 tons--163 ft aft of amidships

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🔍 Key Concepts

• Use the Stability Data Reference Book – Sheet 2 (American Mariner hydrostatic data) to find TPI (tons per inch immersion) and moment to change trim 1 inch (MCT 1") at the correct mean draft. • Compute the net weight change (total loads minus total discharges) and the net trimming moment about amidships (tons × distance from amidships). • Separate the problem into change in mean draft (due to net weight) and change in trim (due to trimming moment), then convert trim into draft changes at the ends using the LCF–FP/AP distances from the sheet.

💭 Think About

• Before anything else, calculate the ship’s initial mean draft from the given forward and aft drafts. How will adding/removing the net weight affect this mean draft using TPI? • For each load or discharge, decide whether its moment makes the ship trim by the head or by the stern. When you add all four moments together, what is the net effect on trim? • Once you find the total change in trim in inches, how do you split that trim between the forward and aft drafts using the distances from the longitudinal center of flotation (LCF) to the forward and aft perpendiculars?

✅ Before You Answer

• From Sheet 2, make sure you are using TPI and MCT 1" at the correct mean draft range (interpolate if needed). • Double‑check the signs of the moments: loads vs. discharges, forward of amidships vs. aft of amidships, so your net trimming moment direction is correct. • After you get tentative final drafts, confirm that: (1) the difference between forward and aft drafts equals the initial trim plus the calculated change in trim, and (2) the change in mean draft matches the net weight added using TPI.

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Question 1 of 2066636eec28f7522a1c51cb65

Load 170 tons--120 ft fwd of amidships Discharge 100 tons--28 ft fwd of amidships Discharge 70 tons--122 ft aft of amidships Load 200 tons--163 ft aft of amidships

Back

Question 1 of 20

66636eec28f7522a1c51cb65

Load 170 tons--120 ft fwd of amidships Discharge 100 tons--28 ft fwd of amidships Discharge 70 tons--122 ft aft of amidships Load 200 tons--163 ft aft of amidships

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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