A. Describe how water tightness is maintained where bulkheads are pierced by longitudinal beams or pipes. 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.

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