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

Exam Question

(a) Describe the effect of cavitation on the propeller blades. (8)

(b) A propeller 4.6m diameter has a pitch of 4.3m and boss diameter of 0.75m. The real slip is 28% at 95 rev/min. Calculate the speed of advance, thrust and thrust power.

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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