J/30 Class Association Forums J/30 Forum Racing Tools and Techniques PHRFof Narragansett Bay

The rating is based on the sail only. Since the 163% genoa is usually too overpowered without crew weight, it makes sense to get the credit and use the smaller sail. If it is real light air, the smaller sail obviously hurts more than helps. That's what PHRF is all about - optimize the rating! You can't switch back and forth between ratings in a series. I use the OD rating whenever I race with crew, and the 110% headsail rating just for doublehanded races.