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Class 2 (2nd Engineer) MEKG 📅 Dec 2023

Exam Question

With reference to Keyless Propellers:

(a) Sketch a section through a keyless sleeved propeller. (6)

(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. (3)

(d) State the material uses to bond the sleeve to the propeller and the general thickness of the bonding material. (3)

Exam question diagram

Reference Answer

### (a) Sketch of a Keyless Sleeved Propeller
A cross-sectional sketch is required to illustrate the assembly of a keyless sleeved propeller on a tapered tail shaft. The sketch should clearly label the following components:
* **Propeller Hub/Boss:** The main body of the propeller.
* **Tapered Tail Shaft:** The end of the propeller shaft with a precise conical section.

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