International America's Cup Class

International America's Cup Class

International America's Cup Class

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The International Americas Cup Class is a class of sailing vessels that was developed for the America's Cup competition. These yachts, while not identical, are all designed to a particular formula, so as to make the boats involved in a competition roughly comparable, while still giving individuals the freedom to experiment with the details of their designs. The class was established prior to the 1992 America's Cup because of perceived shortcomings of the 12-metre class, which had been used in the America's Cup since 1958. Previously, J-class yachts were used.

In addition to the America's Cup, IACC yachts are raced in other regatta, including the IACC worlds.

IACC Sail numbers

IACC sail numbers are issued according to the date the ACM measurement committee decides the hull has reached a certain stage of completion. The number comes in two parts the country of ownership represented by the three letter prefix, and the hull number. The country code changes as the hull is transferred from country to country. Only one boat had a sail number issued twice as in the case of RUS-62 which was a new boat based on the heavily modified hull of RUS-24 and re-registered as RUS-62.


Version 5.0 of the International America's Cup Class Rule was issued on December 15, 2003. Copyright held jointly by the Defender Alinghi and the 'Challenger of Record' BMW Oracle Racing.

Typical parameters of an IACC yacht are:

  • Length: 25 metres
  • Weight: 24 tonnes
  • Height of the mast: 35 metres
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