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| The International Rule was first sailed in 1907 and formed the mainstay of the Olympic classes up until the mid-fifties, the British-American Cup through the 1930's and the America's Cup from after WWII and the demise of the big boats up until the mid-1980's. The boats are measured in Metres to distinguish them from the previous Linear Rule which were measured in feet and the units in either rule are no indication of size - for instance a 6 Metre (6mR) actually measures around 11 metres. They are generally reckoned to be the fastest and most stylish day racing boats - certainly some of the biggest, the 23mR were almost synonymous with the 'J'-class yachts. As a development class there has been endless experimentation to advance yacht design and sailing technique and there are some very famous boats as a result.
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