Exam Question

(a) Explain why the bilging of empty double-bottom or deep tanks below the waterline leads to an increase in GM. (6)

(b) A ship of 22000 tonne displacement is 160 m long and MCT1cm 280 tonne m, waterplane area 3060 m2 centre of buoyancy 1 m aft of midships and centre of flotation 4 m aft of midships. It floats in water of 1.007 t/ m3 at draughts of 8.15 m forward and 8.75 m aft. Calculate the new draughts if the vessel moves into sea water of 1.026 t/ m2. (10)