http://www.ussailing.org/portsmouth/

Quote
The 2008 North American Portsmouth Yardstick for centerboard boats, multihulls, keelboats and offshore classes are posted herein. The Yardstick is a widely used method of rating boats of different classes sailing the same courses and is used by clubs and fleets across the country. It is a time-on-time handicapping system and is derived from actual records of classes of boats with thoroughly documented ratings. Portsmouth Numbers are defined as the length of time boats would take to sail a common but unspecified distance. The formula is easy to use:
CT (Corrected Time) = ET (Elapsed Time) X 100 / HC (Handicap)

Annual changes in ratings are modest. The elapsed time for each boat in a race is measured against the primary and secondary yardstick classes in the race and a handicap calculated for each boat. These are stored in the database by Beaufort number. When there are new data, the previous ratings are adjusted by 25% of the difference between the old ratings and new history.


Well for me the ys for the foiling moth is a lot further from the truth than the a-class. 84? and in reality not too far off the pace of an a-class.

should have been addressed by now.


C2 AUS 222 by Goodall design
"Darph Bobo"