Academics – Naval Architecture : 2017/MAR/06 – 2014/APR/06
Question
Q6. The following data were obtained during acceptance trials for a ship of 11650 tonne displacement:
ship speed 16 knots
torque delivered to the propeller 340 kNm
propeller thrust 465 kN
propeller speed 1.85 rev/s
effective power 2900 kW
propeller efficiency 67%
apparent slip ratio 0.06
transmission losses 3%
Calculate EACH of the following:
(a) the pitch of the propeller; (3)
(b) the Taylor wake fraction; (4)
(c) the real slip ratio; (1)
(d) the thrust deduction fraction; (3)
(e) the quasi-propulsive coefficient; (2)
(f) the Admiralty Coefficient based upon shaft power. (3)
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