You can find the provisional IRSA 65 Class rules under the relevant sections of this website (look under Documents and/or Classes).

In creating the IRSA 65 class rules, based on the RG65 class rules, the guiding principles have been:

• The class rules are written in the WS SCR format using terms defined in the ERS. 
• The sail measurement system is specified 
• Ballast materials denser than lead are prohibited 
• A draught limit is introduced 
• Sail marks rules are rationalised with those in Appendix E of the RRS 
• The rules for racing are specified as the RRS. 
• Changing the fin/ballast unit after each day’s racing is prohibited. 
• Measurement and certification of boats is by independent official measurers 