The International Ten 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. "Ten" in class name does not, somewhat confusingly, refer to length of the boat, but product of the formula; 10 Metre boats are, on average, 16.5 meters long.
History
The 10 Metre was used as an Olympic Class during the
1912
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and
1920 Olympics
The 1920 Summer Olympics (; ; ), officially known as the Games of the VII Olympiad (; ; ) and commonly known as Antwerp 1920 (; Dutch language, Dutch and German language, German: ''Antwerpen 1920''), were an international multi-sport event held i ...
.
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 20 boats were built.
Rule development
1907 Rule
Used from 1907 to 1920
thumb
The thumb is the first digit of the hand, next to the index finger. When a person is standing in the medical anatomical position (where the palm is facing to the front), the thumb is the outermost digit. The Medical Latin English noun for thumb ...
:
where
*
= waterline length (LWL)
*
= beam
*
= chain girth
*
= difference between girth and chain
*
= sail area
*
= freeboard
1919 Rule
Used from 1920 to 1933
thumb
The thumb is the first digit of the hand, next to the index finger. When a person is standing in the medical anatomical position (where the palm is facing to the front), the thumb is the outermost digit. The Medical Latin English noun for thumb ...
:
where
*
= waterline length (LWL)
*
= chain girth
*
= difference between girth and chain
*
= sail area
*
= freeboard
Events
Olympics
References
{{DEFAULTSORT:10
Keelboats
Olympic sailing classes
Development sailing classes