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Academics – Naval Architecture : 2025/MAR/08
Question

Q8. A model propeller of mean pitch 0.4 m, is tested in a tank under conditions of constant speed of advance 2 m/s in fresh water of density 1000 kg/m3 and the results for a range of rotational speeds are as shown in Table Q6.

Revs/sec678910
Thrust (N)165245355490685
Torque (Nm)13.516.023.534.452.2

Table Q6

(a) Plot a curve of propeller efficiency against real slip. (12)

(b) Determine EACH of the following at maximum propeller efficiency:

(i) real slip; (1)

(ii) rotational speed. (3)

Asked in Year/Month/Ques No.
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