Q7. A ship 150 m tong has a load displacement of 27500 tonne in sea water of density 1025 kg/m3. To maintain a speed of 16 knots in the above condition of trials, a shaft power of 7860 kW is required.
SCF for trial condition = 1.08
SCF for service condition = 1.23
Quasi-propulsive coefficient (QPC) = 0.70
Transmission losses = 3%
Wetted surface area (m2) = 2.57 √∆L
Calculate the shaft power required in service for a geometrically similar ship of 22360 tonne load displacement operating at the corresponding speed. (16)
Note: The frictional coefficient for the 27500 tonne ship in sea water is 1.413
The frictional coefficient for the 22360 tonne ship in sea water is 1.415
The frictional coefficients are to be used with speed in m/s Speed index (n) is 1.825
Please buy a membership plan and login via our app to view answers.
Download our App
