Exam Question

(a) Explain what is meant by: (6)

(i) Wave-making resistance

(ii) Frictional resistance

(iii) Eddy-making resistance

(b) When a ship is 800 nautical miles from port its speed is reduced by 20%, thereby reducing the daily fuel consumption by 42 tonnes and arriving in port with 50 tonnes on board. If the fuel consumption in t/h is given by the expression (0.136+0.001V^3) where V is the speed in knots, estimate: (10)

(i) The reduced consumption per day

(ii) The amount of fuel on board when the speed was reduced

(iii) The percentage decrease in consumption for the latter part of the voyage

(iv) The percentage increase in time for this latter period