Q13. (a) state the advantages and disadvantages of aluminium alloy in ship building. (4)
(b) Describe, with the aid of sketch, a method of welding aluminium panels. (6)
Q13. (a) Explain why twin skeg rudders may be fitted on some vessels. (3)
(b) Explain the advantages of a twin skeg installation in modern vessels with a large cargo carrying capacity. (7)
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