If sponsons are fitted, it is necessary to establish the
maximum assumed damage penetration (B/5) to be used when deciding
on the various damage cases. For this purpose, the breadth 'B' in
way of such sponsons should be measured to the outside of the sponsons.
Clear of any such sponsons, the breadth 'B' should be the midship
breadth measured to the outside of the original shell. In other words,
the assumed penetration of B/5, is the same as that which applied
before the fitting of sponsons.