Jeff - I just emailed Harley Nethken to see if he has the Autocad file for the rudder. He was the one who provided the keel in Autocad format.

I uploaded the rudder cross sections in Excel format along with the 2008 Class Drawings and Specifications. Download this PDF file, then you'll find an attached Excel spreadsheet with the info. http://j30.org/html/technical/J30-2008-Dwgs-Specs.pdf

That is the direct link to the file you navigate to using the menu from the home page under "Class", "J/30 Drawings & Specifications"

Bill