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Class 2 (2nd Engineer) MEKG 📅 Jun 2024

Exam Question

With reference to Keyless Propeller: (16)

(a) Sketch a section through a keyless sleeved propeller.

(b) State the advantages of using a keyless sleeved propeller.

(c) State with reason, Which metal sleeve should be made for contact with the forged mild steel tail shaft?

(d) State the material used to bond the sleeve to the propeller and the general thickness of the bonding material.

Exam question diagram

Reference Answer

### (a) Sketch of a Keyless Sleeved Propeller
A cross-sectional sketch should illustrate the following components in their assembled state:
1. **Tail Shaft**: The tapered end of the propeller shaft.
2. **Inner Sleeve**: A thin-walled, tapered sleeve (typically Pearlitic Cast Iron) fitted onto the tail shaft. Its inner surface is parallel, and its outer surface is tapered to match the propeller boss.

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