Academics – Naval Architecture : 2012/DEC/06
Question
Q14. The following data apply to a ship travelling at 16 knots:
Propeller speed = 1.8 rev/sec
Propeller pitch ratio = 0.9
Real slip ratio = 0.33
Taylor wake fraction = 0.30
Torque delivered to the propeller = 420 kNm
Propeller thrust = 560 kN
Quasi-propulsive coefficient (QPC) = 0.70
Transmission losses = 3%
Fuel consumption per day = 24.5 tonne
Calculate EACH of the following:
(a) The apparent slip ratio;
(b) The propeller diameter;
(c) The propeller efficiency;
(d) The thrust deduction fraction;
(e) The specific fuel consumption.
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