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MEO Class II – NAVAL : 2017/JUL/07
Question
Q7. The values of effective power (naked hull) given in Table Q5 refer to a ship which is to have a service speed of 17.75 knots.
Speed (Knots) | 16.5 | 17.0 | 17.5 | 18.0 | 18.5 |
ePn (kW) | 7580 | 8680 | 10300 | 12320 | 14610 |
The following data also apply:
appendage allowance = 8%
weather allowance = 15%
quasi propulsive coefficient = 0.7
transmission losses = 3%
engine mechanical efficiency = 85%
ratio of service indicated power to installed machinery indicated power = 0.9
A. Determine the indicated power of the engine to be installed.
B. Determine the speed obtained if all the available power of the engine is used in EACH of the following:
(i) when the ship is running on acceptance trial in calm conditions;
(ii) when operating under actual service conditions.
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