Q12.Describe the in-water survey to classification society requirements of the underwater structure of a very large carrier. (10)
Q13. Describe, with the aid of sketches, how main propulsion efficiency can be improved by the addition of EACH of the following:
(a) ducted propeller (Kort nozzle) ;(5)
(b) vane or Grim wheel aft of the propeller. (5)
Q13. (a) With reference to bilge keels:
(i) describe how the design and method of attachment reduces the possibility of damage to the shell plate; (5)
(ii) state what testing must be carried out. (2)
(b) Explain why the bilge keels do not extend the full length of the vessel. (3)
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