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Q6. A. Explain the term angle of loll and state what, if any dangers it poses to a vessel. (6)

B. A propeller has a pitch ratio of 0.95. When turning at 120 rev/min the real slip is 30%, the wake fraction 0.28 and the ship speed 16 knots. The thrust is found to be 400 KN, the torque 270 KN-m and the QPC 0.67. Calculate:

i. The propeller diameter

ii. The shaft power

iii The propeller efficiency

iv. The thrust deduction factor. (10)