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12 The cubic capacity of a lifeboat shall be measured in cubic metres and, subject to section 15, may be determined by Stirling’s (Simpson’s) Rule, where
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where L denotes the length of the lifeboat in metres from the inside of the planking or plating at the stem to the corresponding point at the stern post or to the inside of the transom where the lifeboat has a square stern, and where A, B and C denote respectively the area of the cross-sections at the quarter-length forward, amidships and the quarter-length aft, that correspond to the 3 points obtained by dividing L into 4 equal parts (the areas corresponding to the ends of the boat being considered negligible), and the areas A, B and C shall be deemed to be given in square metres by the successive application of the following formula to each of the 3 cross-sections:
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13 If the sheer of the gunwale, measured at the two points situated at a quarter of the length of the lifeboat from the ends, exceeds one per cent of the length, the depth used in calculating the area of cross-sections A and C in section 12 shall be deemed to be the depth amidships plus one per cent of the length of the lifeboat.
14 If the depth of the lifeboat amidships exceeds 45 per cent of the breadth, the depth used in calculating the area of the midship cross-section B shall be deemed to be equal to 45 per cent of the breadth, and the depth used in calculating the areas of the quarter-length sections A and C is obtained by increasing the last figure by an amount equal to one per cent of the length of the lifeboat, but in no case shall the depths used in the calculation exceed the actual depths at these points.
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(2) The form of a lifeboat shall be such that the half-girth amidships, measured over the planking from the centre of the keel to the top of the gunwale, shall be not less than 88 per cent of the sum of half the breadth amidships and the inside depth amidships, and the half-girth at the quarter lengths forward and aft shall be not less than 80 per cent of that sum.
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