Universal Rule Formula
Mathematically, the Universal Rule formula was:
Variables:
- L - Boat length
- S - Sail area
- D - Displacement
- R - Rating
The numerator contains a yacht's speed-giving elements, length and sail area, while the retarding quantity of displacement is in the denominator. Also the result will be dimensionally correct; R will be a linear unit of length (such as feet or meters).
The listing for single mast boats, namely classes I through S.
- Class I: Rating = 88 feet
- Class J: Rating = 76 feet
- Class K: Rating = 65 feet
- Class L: Rating = 55 feet
- Class M: Rating = 46 feet
- Class N: Rating = 38 feet
- Class P: Rating = 31 feet
- Class Q: Rating = 25 feet
- Class R: Rating = 20 feet
- Class S: Rating = 17 feet
There were multi-mast classes too, running Class A to Class H.
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