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Academics – Naval Architecture : 2017/MAR/05
Question

Q5. A ship model of length 6 m has a wetted surface area of 6.62 m2. When tested in fresh water of density 1000 kg/m3, at a speed of 1.8 m/s, the total resistance was measured at 48 N.
This tank speed corresponds with a trial ship speed of 17.5 knots in sea water of density 1025 kg/m3, which is achieved when the shaft power is 8720 kW, when the propulsive coefficient is O. 67.
Calculate the Ship Correlation Factor (SCF) for the ship in this trial condition.  (16)
Note:     The frictional coefficient for the model in fresh water is 1.655
The frictional coefficient for the ship in sea water is 1.413
Speed in m/s with the speed index (n) for ship and model 1.825.

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