7 Metre (keelboat)
Encyclopedia
The International Seven Metre Class is a construction class, meaning that the boats are not identical but are all designed to meet specific measurement formula, in this case International Rule. At their heyday, Metre Classes were the most important group of international yacht racing classes, and they are still actively raced around the world. "Seven" in class name does not, somewhat confusingly, refer to length of the boat, but product of the formula; 7mR boats are, on average, 13 meters long.

History

The 7mR was used as an Olympic Class during the 1908
Sailing at the 1908 Summer Olympics
Sailing/Yachting is a Olympic sport starting from the Games of the 1st Olympiad . With the exception of 1904 and possible 1916 sailing was always a part of the Olympic program....

 and 1920 Olympics
Sailing at the 1920 Summer Olympics
The sailing at the 1920 Summer Olympics consisted of a total of 16 sailing classes . Two of these classes finally did not have entries. For each class three races were scheduled from 7 July 1920 to 9 July 1920 of the coast of Ostend North Sea. On 10 July 1920 sail-off races could be held.Two...

.
The International Rule was set up in 1907 to replace earlier, simpler handicap system which were often local or at best, national, and often also fairly simple, producing extreme boats which were fast but lightly constructed and impractical. The rule changes several times in history. About 200 boats were ever build.

1907 Rule

Used from 1907–1920
where
  • = waterline length (LWL)
  • = beam
  • = chain girth
  • = difference between girth and chain
  • = sail area
  • = freeboard

1919 Rule

Used from 1920–1933.
where
  • = waterline length (LWL)
  • = chain girth
  • = difference between girth and chain
  • = sail area
  • = freeboard

1908 (1907 rule)

Only one boat at the starting line.
Rank Country Helmsman Crew
RIVETT-CARNAC, charles James BINGLEY, Norman
DIXON, Richard Travers
RIVETT-CARNAC, Frances Clytie

1920 (1919 rule)

This time two boats at the starting line.
Rank Country Helmsman Crew
WRIGHT, Cyril Macey WRIGHT, Dorothy Winifred
COLEMAN, Robert Henry
MADDISON, William J.
Faye, Johan DICK Christian
ABEL Sten
NEILSEN Niels
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