Class 2 (2nd Engineer) SC&S 📅 Mar 2018

Exam Question

(a) Describe the relationship between frictional resistanee and:

(i) Ship speed

(ii) The wetted area

(iii) The surface roughness

(iv) The length of the vessel

(b) A ship travels at 15 kmots and has a QPC or 0.865 with a delivered power of 2600 kW. The apparent slip and 5% and the real slip is 28%. Calculate the total resistance and the wake fraction

Reference Answer

Frictional resistance arises due to the interaction between the ship's hull and the water as the vessel moves. This resistance is caused by eddying water adjacent to the hull that is drawn along with the ship. The frictional resistance is given by:
$$R_{f\:=\:}f\:.\:s\:.\:v^{n}$$
Where:
f = Coefficient of friction

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