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Q14. For a ship 120 m in length and 16 m breadth, the draught is 7 m in sea water of density 1025 kg/m and the block coefficient is 0.7. The effective power (naked) of the ship at a speed of 14 knots is estimated at 1900 kW, Wetted surface area (m²) = 2.57

Calculate the pull required to tow a similar model of length 4.8 m at the corresponding

Speed in fresh water of density 1000 kg/m³.

Note: The frictional coefficient for the model in fresh water is 1.703

The frictional coefficient for the ship in sea water is 1.421

Speed in m/s with index (n) for ship and model 1.825