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Class 2 (2nd Engineer) MEKG 📅 Oct 2023

Exam Question

With reference to Keyless Propellers:

(a) Sketch a section through a keyless sleeved propeller. (4)

(b) State the advantages of using a keyless sleeved propeller. (4)

(c) State with reasons, which metal sleeve, should be made for contact with the forged mild steel tail shaft. (4)

(d) State the material used to bond the sleeve to the propeller and the general thickness of the bonding material. (4)

Exam question diagram

Reference Answer

### (a) Sketch of a Keyless Sleeved Propeller
A cross-sectional sketch should clearly illustrate the following components in their assembled state:
1. **Forged Steel Tail Shaft**: Show the tapered section where the propeller is mounted.
2. **Pearlitic Cast Iron Sleeve**: This is a thin, tapered sleeve fitted over the tail shaft. Its inner surface is in direct contact with the shaft, and its outer surface is bonded to the propeller boss.

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