Academics – Naval Architecture : 2020/OCT/07
Question
Q7) A ship of length 150 m and breadth 19 m floats at a draught of 8.5 m in sea water of density 1025 kg/m3. In this condition the block coefficient ( Cb) is 0.69.
At a speed of 16 knots the following data applies:
delivered power = 6800 kW
quasi propulsive coefficient (QPC) = 0.71
correlation factor (SCF) = 1.20
Wetted surface area (S) = 2.57√∆L ( m2)
Calculate the pull required to tow a similar model of length 5 m at the corresponding speed in fresh water of density 1000 kg/m3. (16)
Note: The frictional coefficient for the model in fresh water of density 1000 kg/m3 is 1.694
The frictional coefficient for the ship in sea water of density 1025 kg/m3 is 1.413
Speed in m/s with the speed index (n) for ship and model 1.825
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