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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 used to bond the sleeve to the propeller and the general thickness of the bonding material. (3)

Q3. With reference to sleeved keyless propeller assemblies:

A. State with reasons which metal the sleeve should be made for contact with a forged mild steel tail shaft.  (3)

B. State the material used to bond the sleeve to the propeller boss and the general thickness of the bonding material. (3)

C. When removing the propeller from the tail end shaft, state why the following procedures are not recommended: (6)

(i) Application of push off force by means of wedges or jacks and draw off force by strong back.

(ii) Expansion of propeller boss by concentrated local heating with gas torches.

D.  State the correct procedure for the removal of the propeller from tail end shaft. (4)

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Q3. With reference to sleeved keyless propeller assemblies:

A. (i) State, with reasons, the metals used in the manufacture of the sleeve and tail end shaft;

(ii)State the type and thickness of material used to bond the sleeve to the propeller boss.

B. When removing the propeller from the tail end shaft, state why the following procedures are not recommended:

(i) Application of push off force by means of wedges or jacks and draw off force by strong back;

(ii) Expansion of propeller boss by concentrated local heating with gas torches.

C.  State the correct procedure for the removal of the propeller from tail end shaft.

Q9. 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. (4)

C. Give reasons why this method is considered to be superior to all other methods. (4)