Current J/Models

J/22

J/24

J/80

J/92S

New J/95

New J/97

J/100

J/105

J/109

New J/111

J/122

J/124

J/133

Recommended PHRF Ratings
February 3, 2009

To: PHRF Handicappers From: Rod Johnstone, Designer

Subject: Recommended PHRF Ratings for J/Boats in 2009

The relative speed of various models of J/Boats in seconds per nautical mile is listed below. The table shows relative predicted speed of each model compared to one of five “control” J Boats, each in a different speed range, whose actual performance has become widely known in many PHRF areas over many years. The five “control” J Boats used in this comparison are the J/44, J/35, J/29 (Masthead outboard), J/30 and J/24. Assumptions are that:

1. Except where noted as “One Design”, each model conforms to all local PHRF definitions of an unmodified “base boat” with a base 150 to155% genoa (depending on local regulations).

2. Maximum spinnaker size (without penalty) conforms to local PHRF regulations defining base spinnaker size, except where One Design definition of spinnaker size accompanies the speed prediction shown in the table below.

3. Wind strength averaging ten knots is used to predict relative speed. Because most J Boats have similar characteristics in different wind strengths, this is a valid way to predict speed differences versus one of the five “control” boats over a wide wind range.

4. NEW for 2009. PHRF numbers are recommended for each boat relative to the “Control” boat listed, based on two separate types of courses.

The first type of course can best be called “buoy racing” around government marks with a mix of beating, reaching and running – not always evenly mixed or even predictable from race to race.

The second type of course is Windward/leeward –usually fairly short courses around portable set marks, because most high-profile PHRF racing occurs on this type of course. Relatively heavier cruising J designs with smaller draft/displacement ratio perform poorly on such courses. Likewise, designs which fly only Asymmetric spinnakers tacked to the centerline are at a slight disadvantage downwind against boats with symmetric spinnakers flown from poles- both speed wise and tactically. If courses used for racing are strictly windward-leeward, then base PHRF handicap numbers recommended for that type of course should be used.

5. Crew Weight: Our rating recommendations for PHRF numbers for J Boat models designated as One Design do not include crew weight limits. It is assumed that PHRF crew weight limits, if any, shall apply equally to all types of boats racing in a given PHRF area, and that One design designation only applies to the boat, rig and sails. Therefore One Design Class Rules regarding crew weight should not apply when racing PHRF if these rating recommendations are used.

PHRF ratings of the five “control” J/Boats may vary somewhat from one PHRF area to another. The PHRF numbers shown are what seem to be typical for these five boats nationally. If the PHRF number shown here is different for the applicable “control” boat in your area, apply the difference to the relative rating of the J/Boat you are handicapping. For instance, if the J/35 rates 66 in your area rather than 72, as shown on the attached table, the number for the J/Boat you are rating would be six s/m less than what is shown.

Please direct questions, input, or comment on these suggested relative J Boat ratings to me at rodj@jboats.com, or tel. 860-535-3480.

Rod Johnstone

2009 PHRF Ratings for all J/Boat Models

Assumes average wind speed of 8 to 12 knots. Maximum genoa and spinnaker size conforms with PHRF norms, except where shown below. Ratings valid relative to Control Boat listed. Crew weight maximums according to local PHRF regulations. Sprits all non-articulating.