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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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