(a) Sketch and describe a Pilgrim Nut for securing a propeller to the screw shaft.
(8)
(b) Describe how this device is used to loosen the propeller on the shaft when removal or inspection becomes necessary.
(5)
(c) Give reasons why this method is considered to be superior to all other methods.
(3)
Reference Answer
### (a) Sketch and Description of a Pilgrim Nut **Concept:** The Pilgrim Nut is a specialized hydraulic nut used for mounting and dismounting large components with an interference fit, most notably marine propellers onto tapered shafts. It functions as a compact, powerful hydraulic jack, capable of generating immense, controllable axial forces to drive the propeller up the shaft taper to achieve the required frictional grip. **Construction:**
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