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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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