R = S ÷ 100 (XIV.) A
The rating so obtained being neither cubic nor linear, but superficial, difficulties as regards time scale arose, and neither Mr. Richardson nor the Council appeared to notice that the rule could easily be made linear by putting it in the form
American R = √S (XIV.) B
when American rating and time scale could have been adopted. Also that it might have been rendered
English R = S √S ÷ constant (XIV.) C
which is the cubic form, suitable for the Y.R.A. rating and time allowance.
The graphic result in the sail-diagram is the same in each case, viz. a horizontal line for any given class, the limit for each class being one of sail-area alone.
It was not adopted because the Council considered that the type evolved from it would be one of excessive length and small displacement; and our experience with the Y.R.A. rule, which approaches it more nearly than any other hull- and sail-area rule, has shown that this estimate was correct.
We will now examine a few of the rules which rate yachts entirely by hull-measurement. The simplest of the kind is the pure length rule, used for some years on the Solent for racing small yachts up to 30 ft. of L. See chapter on Solent Racing.
American R = L (XV.) A