Class 2 (2nd Engineer) SC&S 📅 Mar 2025

Exam Question

(a) Describe the effect of cavitations on the propeller blades (6)

(b) The following data are available from the hydrostatic curves of a vessel.

Draught (m)	KB (m)	KM (m)	I (m^4)
4.9	2.49	10.73	65250
5.2	2.61	10.79	68868

Calculate the TPC at a draught of 5.05m. (10)

Reference Answer

(a) Effect of cavitation on propeller blades:
Erosion:
Cavitation causes the formation and collapse of vapor bubbles on the propeller blade surface.
The collapse of these bubbles produces high-pressure shockwaves and microjets that erode the blade material, leading to surface pitting and progressive damage.

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