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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).
Tanzer 7.5s built in the 1970s had three portlites on each side while those built in the 1980s instead had a single long window on each side. [ 4 ] The shoal draft version, the Tanzer 7.5 SD, has a PHRF racing average handicap of 228 with a high of 237 and low of 207, while the fin keel model has a PHRF of 201.
A velocity prediction program (VPP) is a computer program which solves for the performance of a sailing yacht in various wind conditions by balancing hull and sail forces. VPPs are used by yacht designers, boat builders, model testers, sailors, sailmakers, also America's Cup teams, to predict the performance of a sailboat before it has been built or prior to major modifications.
For sailing downwind the design may be equipped with a symmetrical spinnaker of 1,572 sq ft (146.0 m 2). [ 7 ] The design has a hull speed of 8.06 kn (14.93 km/h) and a PHRF handicap of 81 for the shoal draft model.
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.
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 ...