Exam Question

(a) List the variables which affect the force on a rudder. (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 2550kW.

Calculate:

(i) Indicated power

(ii) Effective power

(iii) Ship speed