Paragraph 8
The total volume of the internal buoyancy appliances shall be such that it will be at least equal to the sum of the volumes of:
(a)
that required to float the boat and its full equipment when the boat is flooded and open to the sea so that the top of the gunwale amidships is not submerged; and
(b)
that equal to 7·5 per cent of the cubic capacity of the boat which shall be determined in the same manner as that prescribed for lifeboats in Schedule 5 to these Rules.