Academics – Naval Architecture : 2021/MAR/08
Question
Q8. The following data were obtained during acceptance trials for a ship of 8000 tonne displacement;
Ship speed = 15.5 knots
Propeller torque =250 kNm
Propeller thrust=325 kN
Propeller speed = 1.75 revs/s
Propeller efficiency = 66%
Effective power = 2010 kW
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;(5)
(c) The real slip ratio;(1)
(d) The thrust deduction fraction;(3)
(e) The quasi-propulsive coefficient;(1)
(f) The Admiralty coefficient based upon shaft power.(3)
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