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Q8. A ship 145 m long, 24.5 m beam displaces 24910 tonne when floating at a draught of 9.5 m in sea water of density 1025 kg/m³.

The propeller has a diameter of 6.0 m and a pitch ratio of 0.95.

With the propeller operating at 1.75 revs/sec, the following results were recorded:

propeller thrust = 1300 kN

real slip = 35 %

propeller efficiency = 67 %

transmission losses = 3 %

fuel consumption per day = 63 tonne

Calculate EACH of the following:

(a) the ship speed; (6)

(b) the apparent slip; (2)

(c) the specific fuel consumption; (4)

(d) the mass of fuel required to travel 3500 nautical miles at a constant speed of 17.5 knots including a reserve of 10%. (4)

Note: Wake fraction = 0.5 C_b-0.05