Version 1 of the AC62 Class Rule is public (here’s the link) , and there aren’t many surprises: 62 feet LOA, 38.5 feet beam, 9,480 pounds max weight, 83+ feet wing height.
There’s a “no helium” clause:
6.11 Gases with a density less than standard atmosphere air shall not be used to reduce the weight of an AC62 Yacht.
And here are two interesting loopholes:
4.1.(b) Within 30 days after ACEA’s announcement of the venue for the Match, the
Measurement Committee, with the approval of the Defender and Challenger of
Record, may amend the AC62 Class Rule in any respect; and
(c) Prior to January 1, 2015, the Measurement Committee, with the approval of the
Defender, Challenger of Record and a majority of the Competitors, may amend the
AC62 Class Rule in any respect.
Guess who picks the Measurement Committee? The “Regatta Director shall nominate candidates” and the GGYC and the Challenger of Record need to sign off on them. Same folks get to fire them.
Again, here’s a link to the AC62 specs document: http://ac.mueva.eu/media/files/m192_ac62-class-rule-v-1-0.zip