Starting in 2010, the NCPHRF Committee introduced Downwind Ratings. These are ratings that only apply to races that are historically downwind events. As downwind performance is strongly affected by length, downwind sail area, displacement, and wetted surface, downwind ratings can vary significantly from standard ratings. A Downwind Rating FAQ is available here. Actual Downwind Ratings for boats that have current certificates can be found on the NCPHRF Current Certificate Holders reports above.
In 2013, The NCPHRF Committee changed the way in which Downwind Ratings are displayed. PHRF downwind is an entirely different system than normal PHRF ratings. The only connection is that the ratings are ratified by the same NCPHRF Committee. The downwind number represents a typical “speed” a boat would be expected to sail in seconds-per-mile on a predominantly downwind course*. Before 2013, this number was shifted to appear more like a normal PHRF rating; but the Committee felt this shift created confusion, rather than reducing it. We have eliminated this shift in order to emphasize that PHRF and PHRF-DW are conceptually different systems.
* in a rather slow race; in a fast race (windy conditions), a boat can be expected to sail to a number about 20% lower.