question of rudder and propeller

Question: (10 marks) (i) A ship propeller having diameter 5 m producing thrust 102.500 KN . The advance velocity of the propeller 10 m/s, determine the ideal propeller efficiency of the ship. (Hint: η p = 2 1 + √ 1+C T and C T = T 0.5 ρ A 0 V a 2 ) Using the above equations for the thrust loading coefficient and ideal propeller efficiency, answer the following: a. Will a larger propeller be more or less efficient than a smaller propeller? b. Will high thrust and low ship speed give high or low efficiency? (ii) A ship has the following particulars, displacement 5,000 tonnes, service speed 20 knots, length of ship 137.16 meters, metacentric height 0.90 m, mean draught 9.14 meters and centre of gravity above the keel is 6.10 meters. Determine the angle of heel during turning. How can you quantify the rudder responsiveness?

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Question:(10 marks)

(i) A ship propeller having diameter 5 m producing thrust 102.500 KN . The advance velocity of the propeller 10 m/s, determine the ideal propeller efficiency of the ship. (Hint: and )

Using the above equations for the thrust loading coefficient and ideal propeller efficiency, answer the following: a. Will a larger propeller be more or less efficient than a smaller propeller? b. Will high thrust and low ship speed give high or low efficiency? (ii) A ship has the following particulars, displacement 5,000 tonnes, service speed 20 knots, length of ship 137.16 meters, metacentric height 0.90 m, mean draught 9.14 meters and centre of gravity above the keel is 6.10 meters. Determine the angle of heel during turning. How can you quantify the rudder responsiveness?

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