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PHRF is used mainly for larger sailboats (i.e., 7 meters and above). For dinghy racing, the Portsmouth yardstick handicapping system is more likely to be used. The handicap number assigned to a class of yachts is based on the yacht's speed relative to a theoretical yacht with a rating of 0.
[1] In the United States, the most common handicapping rule is the PHRF rule, developed and promoted by the United States Sailing Association. [2] While most other rules do not take past performance into account, PHRF differentiates itself by allowing skippers to request handicap reductions after a series of poor racing results.
In the United States, the Thistle was chosen as primary yardstick for compilation in 1961 with a value of 83.0, which corresponded to its RYA PN rating at the time. Other boats were compared using their DIYRA (Dixie Inland Yacht Racing Association) rating to produce the D-PN (Dixie-Portsmouth Number).
Swan 391 flying its spinnaker. The Swan 391 is a recreational keelboat, built predominantly of glassfibre, with wood trim.It has a masthead sloop rig, a raked stem, a reverse transom, an internally mounted spade-type rudder controlled by a wheel and a fixed fin keel or optional shoal-draft keel.
This model has a PHRF racing average handicap of 216. [1] [2] [5] [6] US 25 SD Model with a shoal draft keel giving a draft of 2.67 ft (0.81 m). This model has a PHRF racing average handicap of 237. [6] [8] US 25 CB Model with a retractable centerboard giving a draft of 2.67 ft (0.81 m), allowing beaching or ground transportation on a trailer ...
For sailing downwind the design may be equipped with a symmetrical spinnaker of 1,055 sq ft (98.0 m 2). [ 4 ] [ 5 ] The design has a hull speed of 7.03 kn (13.02 km/h) and a PHRF handicap of 51 to 156.
The boat won recognition, being named the 2005 European boat of the year by Yacht magazine, Germany; Boat of the Year at the Oslo Boat Show and first place in Sailing Magazine's Top Ten Boats. [ 5 ] The boat was at one time supported by a class club that organized racing events, the Sun Fast Association .
The design was built by S2 Yachts in Holland, Michigan, United States, but it is now out of production. [1] [2] [4] [5] [9] [10]In 1989 the company was asked by the S2 7.9 Class Association if the design could be put back into limited production and the company agreed, but with a minimum order of ten boats for production to be restarted.