Q11. Fig Q6 shows the results of progressive speed trials on a ship at a load displacement of 22350 tonne in sea water of density 1025 kg/m3 with a wetted surface area of 4860 m.
Using the data given below, calculate the shaft power required to achieve a service speed of 17 knots with a geometrically similar ship having a load displacement of 29245 tonne in sea water.
Propulsive coefficient based upon shaft power for both trial and service conditions = 0.68
Allowance for appendages and weather in trial condition = 8%
Allowance for appendages and weather in service condition = 20%
Note: Frictional coefficient for the 22350 tonne ship in sea water is 1.410
Frictional coefficient for the 29245 tonne ship in sea water is 1.406
Speed is in m/s with index (n) = 1.825
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