There are various rig tuning guides available for the J/30. The class website has been updated to include the guides from Banks Sails, Shore Sails, UK-Ulmer Sails, and North Sails. The copy of the North Sails document has missing data in some of the tables, so if anyone has that, please sent it to me and I'll update the website.
All but the Shore Sails guide are available online for viewing and to download for printing. Since the Shore Sails guide was an old scanned document, it's only available to download.
Link to web pageOr from the
J/30 Class website menu select "Info", "Articles of Interest", "J/30 Rig Tuning"