Class 2 (2nd Engineer) SC&S 📅 Jan 2024

Exam Question

(a) Explain the term volumetric heeling moments. (6)

(b) A ship 85 m long displaces 8100 tonne when floating in sea water at draughts of 5.25 m forward and 5.55 m aft. TPC 9.0, GMl 96 m, LCF 2 m aft of midships. It is decided to introduce water ballast to completely submerge the propeller and a draught aft of 5.85 m is required. A ballast tank 33 m aft of midships is available. Find the least amount of water required and the final draught forward. (10)

Reference Answer

$$Let\:m=mass\:of\:ballast\:required$$
$$MCT1_{\operatorname{\mathrm{cm}}}=\frac{\Delta\times GM_{L}}{100L}$$
$$=\frac{8100\times96}{100\times85}$$
$$=91.48ton.m$$

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