Exam Question
Describe the relationship between frictional resistance and (16)
(a) Ship speed
(b) The wetted area
(c) The surface roughness
(d) The length of the vessel.
Class 2 (2nd Engineer)
SC&S
📅 Oct 2023
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
$$R_{f\:=\:}f\:.\:s\:.\:v^{n}$$
Where:
f = Coefficient of friction
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