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The process of determining the PHRF for an individual boat begins with the regional PHRF rating, then adjustments are made for the individual attributes of the boat such as: modifications to the rig, the size of the largest foresail (jib or genoa), the size of the spinnakers, type of keel (full, fin, wing etc.), the number of blades on the propeller, and the style of the propeller (fixed ...
[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.
Each class of boat is assigned a "Portsmouth Number", with fast boats having low numbers and slow ones high numbers—so, for example, in the case of two dinghies, a 49er might have a RYA-PY of 697 while a Mirror has a RYA-PY of 1390 (these are the actual RYA Portsmouth numbers for 2018, but note that adjustments are made each year).
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.
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The boat has a PHRF racing average handicap of 159 with a high of 159 and low of 159. [1] [2] [5] Newport 33 SD Model with a shoal draft keel, giving a draft of 4.00 ft (1.22 m). The displacement is 9,300 lb (4,218 kg). The boat has a PHRF racing average handicap of 174 with a high of 174 and low of 183. [6] Newport 33 PH