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Q7. a) Describe the effect of cavitations on the propeller blades. (6)

b) A ship of 15000 tonne displacement has an Admiralty Coefficient, based on shaft power, of 420. The mechanical efficiency of the machinery is 83%, shaft losses 6%, propeller efficiency 65% and QPC 0.71. At a particular speed the thrust power is 2550 Kw. Calculate: (10)

(i) Indicated power

(ii) Effective power

(iii) Ship speed.