The HPR Rule Calculator has a slight revision from the previous posting, but is now available here:
And a summary of the latest rule changes is available here:
*Note: When you enter boats, be sure to start in a column on the "database" page and assign each boat a number in row 2 (green). Then after the column is full in the database, enter the green number in Cell T4 on the "certificate" page. It automatically fills in the certificate for you. That way you can change quickly between boats just by changing the number in T4.
See the What do I rate or Fleet ratings page for the latest rating calculators used in recent events.
Here is the presentation made to the Yacht Racing Design & Technology Symposium in Dec 2011, in PDF and Powerpoint (note: DOCX) formats: