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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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