Q3
With reference to Keyless Propeller:
(a) Sketch a section through a keyless sleeved propeller.
(7)
(b) State the advantages of using a keyless sleeved propeller
(3)
(c) State with reason, 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)
Reference Answer
### (a) Sketch of a Keyless Sleeved Propeller A detailed cross-sectional sketch should clearly illustrate the following components and features: 1. **Tail Shaft**: Show the tapered end of the forged steel tail shaft. 2. **Propeller Boss**: The main body of the propeller hub, typically made of Nickel-Aluminium Bronze (NAB).
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