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MEO Class II – NAVAL : 2020/FEB/10 – 2021/NOV/09 – 2013/MAR/07 – 2013/AUG/07 – 2014/NOV/07 – 2024/OCT/07
Question
Q9. (a) Describe how thrust power is determined. (6)
(b) The following information relates to a model propeller of 400mm pitch:
Rev/Min | 400 | 450 | 500 | 550 | 600 |
Thrust N | 175 | 260 | 365 | 480 | 610 |
Torque Nm | 16.8 | 22.4 | 28.2 | 34.3 | 40.5 |
(i) Plot curves of thrust and torque against rev/min
(ii) When the speed of advance of the model is 150 m / min and slip 0.20, calculate the efficiency.
Asked in Year/Month/Ques No.