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Academics – Naval Architecture : 2021/OCT/08
Question

Q8) The following data applies to a ship operating on a particular voyage with a propeller of 6 m diameter having a pitch ratio of 0.9.

Propeller speed = 1.85 revs/s
Real slip = 33%
Apparent slip = 6%
Shaft power = 11000kW
Specific fuel consumption = 0.205 kg/kWhr

Calculate EACH of the following:

(a) the ship speed in knots; (3)

(b) the taylor wake fraction; (3)

(c) the reduced speed at which the ship should travel in order to reduce the voyage consumption by 30%; (2)

(d) the voyage distance if the voyage takes 30 hours longer at the reduced speed; (4)

(e) the amount of fuel required for the voyage at the reduced speed. (4)

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