Universal Rule - Universal Rule Formula

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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