# Mean Draft and Change in Trim

Discussion in 'Stability' started by Dibin_marino, Mar 22, 2014.

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### Dibin_marinoJunior Member

Given the following Hydrostatic Data and If the draft at perpendiculars forward is 5.80 m and aft is 6.20 m when floating in salt water:

What would be the draft when the ship enters the freshwater at constant displacement? How much will the change of trim be? Show your calculation please.

METRIC MARINER

LBP = 160 meters
Light Ship Displacement = 7,798 tons
Light Ship VCG = 9.60 meters
Light Ship LCG aft of F.P. = 84.28 meters

Hydrostatic Data
Draft in Meters,
Displacement in Metric Tons,
KM in Meters,
TPC in Metric Tons / Centimeter,
MT1 in M-tons/cm,
LCB and LCF in Meters "+" = aft, "-" = fwd of Midships
Density Assumed = 1.025

Draft ...... Displacement ...... KM.......TPI..........MTC..........LCB .........LCF
3.66...........7,468 ..................11.95.....23.44.......154.89....... -0.02........+0.68
3.96...........8,230 ..................11.52.....23.68.......159.76.......+0.07........+0.89
4.27...........8,931 ..................11.13.....23.92.......162.20.......+0.13........+1.11
4.57...........9,749...................10.76.....24.16.......164.64....,..+0.25........+1.35
4.88.........10,465...................10.45.....24.40.......170.12.......+0.35........+1.53
5.18.........11,166...................10.24.....24.60.......175.62.......+0.44........+1.84
5.49.........11,720...................10.03.....24.80.......176.35.......+0.53........+2.11
5.79.........12,700.....................9.88.....25.04.......176.84.......+0.62........+2.36
6.10.........13,432.....................9.72.....25.28.......180.50.......+0.74........+2.66
6.40.........14,225.....................9.63.....25.52.......184.16.......+0.86........+2.97
6.71.........15,038.....................9.57.....25.80.......187.81.......+0.99........+3.21
7.01.........15,850.....................9.51.....26.04.......192.69.......+1.11........+3.52
7.32.........16,663.....................9.48.....26.36.......198.18.......+1.23........+3.85
7.62.........17,476.....................9.47.....26.64.......203.67.......+1.35........+4.22
7.93.........18,268.....................9.47.....26.88.......208.55.......+1.50........+4.52
8.23.........19,102.....................9.48.....27.20.......215.26.......+1.63........+4.89
8.54.........19,915.....................9.50.....27.48.......223.18.......+1.78........+5.25
8.84.........20,727.....................9.54.....27.84.......229.28.......+1.93........+5.59
9.15.........21,642.....................9.57.....28.16.......237.82.......+2.08........+5.92
9.45.........22,353.....................9.60.....28.44.......243.91.......+2.24........+6.26

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### TANSLSenior Member

Let's do the opposite: you give the solution, you show the calculations you have done, and we will tell you if it is correct or not. What you think.?

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### Mr EfficiencySenior Member

Haha, you think the dog ate his homework, TANSL ?

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### Mr EfficiencySenior Member

Could the ship be the S.S Assignment ?

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