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The International Six Metre Class is a class of classic racing yachts. Sixes are 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, Sixes were the most important international yacht racing class, and they are still actively raced around the world. "Six metre" in class name does not, somewhat confusingly, refer to length of the boat, but product of the formula; 6mR boats are, on average, 10–11 metres long.
The International Rule was set up in 1907 to replace numerous handicap systems 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 Six Metre class was not the smallest rating established under the rule, but was nonetheless the most popular, and they were chosen as an Olympic class in 1908. However, it was not until revision of the Rule in 1920 when the Sixes really became a popular international racing class. The 1920s and '30s were 'golden age' of the International Rule boats and Sixes were still the most popular class, attracting top sailors and designers to compete for prestigious trophies such as Scandinavian Gold Cup and Olympic medals.
Alexander Robertson and Sons Ltd (Yachtbuilders) produced a total of five 6-Metre yachts between 1921 and 1953. In 1937 their young naval architect David Boyd designed the sleek 6-Metre racing yacht Circe, which was described by many as the most successful racing yacht produced at the yard. Mr J. Herbert Thom, one of the Clyde's best helmsmen sailed the yacht with tremendous success in America in 1938 and brought back the Seawanhaka Cup, which was successfully defended in home waters the following year. In later years Circe represented Russia in the 1952 Summer Olympics.
However, Sixes were also criticized as having become too expensive and towards the end of 1930s they became more so, making the class too exclusive, as under what is known as the Second International Rule (1920 - 1933) the yachts had gone from being less than 30 feet in overall length to being almost 40 feet. By 1929, 5 Metre class was becoming more popular as a cheaper and smaller alternative for Sixes, but the final blow was creation of International 5.5 metre class in 1949. 5.5 m soon replaced 6mR as the premier international racing class, and after 1952 Helsinki Olympics Sixes were dropped from Olympic regattas. The Gold Cup was also transferred to 5.5 m class from 1953 onwards.
Despite this, the class continued to exist, and new boats were made utilising the newest contemporary technologies, although sparingly. During 1980s, many old sailboat classes experienced revival of interest and Sixes were at the forefront of this development. The Class has undergone a renaissance which has continued to the day, with many old yachts restored or rebuilt to racing condition, and 6mR competition is once again thriving. Performance differences between classic and modern era Sixes are usually small and they can be raced together.
The 6 Metre Class is one of the potential Vintage Yachting Classes for the 2012 Vintage Yachting Games.
Several variations of the rule have been developed to meet specific criteria. Perhaps the best known is International One Design class, which was designed by Cornelius Shields and based on the 6mR boat Saga.
- Sailing at the 1908 Summer Olympics – 6 metre class
- Sailing at the 1912 Summer Olympics – 6 metre class
- International Six Metre Association
- Metre Boat Index
- Book: The Six Metre - 100 Years of Racing, published on the centenary of the International Rule