Okay, let's clear the air here because this is very important.

Nacra does not currently offer class rules for any of our boats that are not current racing classes.
Having class rules to cover multiple classes of boats is too broad and there are too many variables to make accurate and fair class rules.
Additionally, we don’t want to dictate class rules fully from the manufacturer. Any of our current "manufacturer supplied classes" we work with the class to finalize all rules.
There are class rules for specific active classes run by the class.
If a group of Nacra owners wants to form a class and make class rules then we would support that.
In the meantime, any boats that are stock adhere to the standard portsmouth or other rating number and those that don’t will take a deduction in their rating per the handicap system being used.
Stock is as supplied or identical to the OEM.

Class legal sails, It’s easiest to go to Elliot Patterson and have them make you sails. Any non-OEM cut from EP or anyone other sailmaker would not be class legal and would require a modification.
Nacra approves Elliot Patterson for all boats that they made OEM sails for. That is all boats through the Nacra F18 and Nacra 20 essentially boat built through 2005, Performance Sails are the approved sails for all Nacras. My personal recommendation would be to go to Elliot Patterson for the Nacra 4.5, 5.0, 5.2, 5.5, 5.7, 5.8, and 6.0, again, these sails from EP that match the OEM design would be class legal.

Regards,
Todd Riccardi
Nacra North America
Todd@Nacrasailing.com