Q9: 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
Q1. A. Explain the ideal design requirements of a ships propeller; B. briefly describe the propeller maintenance that should be carried out to prevent the fuel being wasted.
Q6. With reference to keyless propellers explain:
a) Why keys and keyways have been eliminated
b) How angular slip is avoided
c) Why mounting upon and removal of a propeller shaft requires a different technique than that employed for propeller with keys.
d) State with reasons why use of wedges and jacks are not advisable when removing the propeller from its shaft
Q1.a) What are the different types of coupling bolts used in practice? Name at least 3. (3)
b) Explain with the help of sketch, as to how a ‘pilgrim’ hydraulic bolt is fitted and removed? (8)
c) How are fitted boards installed on the coupling? (5)
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