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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.  
 

Boat Model

Control Boat

Special Notes

Triangular

WWD/LWD

J/145

-18

J/125

Carbon rig

J44

8.5' sprit, rf, 175 sqm Asail

-3

J/160

Deep Draft, carbon rig

J44

7.0' sprit, rf, 265 sqm Asail

-3

J/160

7' draft, carbon rig

J44

7.0' sprit, rf, 265 sqm Asail

3

J/133

Standard

J44

6.75' sprit, rf, 186 sqm Asail

18

J/130

Carbon rig

J44

7.0' sprit, rf, 200 sqm Asail

21

J/130

6'9" draft, carbon rig

J44

7.0' sprit, rf, 200 sqm Asail

27

J/44

One Design

CONTROL

27

J/122

30

J/124

7' draft, carbon rig

J44

No sprit, rf, 120 sqm Asail

36

J/44

6.5' shoal draft

J44

UFO keel

36

J/46

33

J/46

48

J/90

Carbon rig

J35

7.3' sprit, 112 sqm Asail

51

J/39

Aluminum rig

J35

51

J/120

Carbon rig

J35

7.0' sprit, rf, 165 sqm Asail

51

J/120

5.75' shoal draft

J35

7.0' sprit, rf, 165 sqm Asail

57

J/41 IOR

Aluminum rig

J35

various rig config, forward lead removed

66

J/37

Standard Draft, aluminum rig

J35

69

J/37

5.2' shoal draft

J35

UFO keel

84

J/109

69

J/35

One Design

CONTROL

72

J/109

78

J/42

6.5' draft, carbon rig

J35

No sprit, rf, 140 sqm Asail off bow

81

J/42

5.4' draft

J35

No sprit, rf, 140 sqm Asail off bow

90

J/105

PHRF base, aluminum rig

J35

5.5' sprit, rf, 89 sqm Asail

81

J/105

One Design

100% jib, 5.5' sprit, 89 sqm Asail

90

J/100

PHRF base, carbon rig

J35

No sprit, rf, 80 sqm Asail off bow

81

J/100

One Design, carbon rig

J35

100% jib, rf, 80 sqm Asail off bow

90

J/105

Shoal Draft

*******

Add 6 sec/mile to any of J105 standard versions

**

J/40

6.5' draft, aluminum rig

J35

84

J/40

5.4' draft

J35

UFO keel

93

J/33

One Design

J35

81

J/36

One Design

J35

81

J/110

6.0' draft carbon rig

J35

5.5' sprit, rf, 140 sqm Asail

93

J/35c

6.5' draft aluminum rig

J35

96

J/92s

One Design, aluminum rig

J29MO

5.5' sprit, rf, 85 sqm Asail

99

J/92

PHRF Base, aluminum rig

J29MO

5.5' sprit, rf, 91 sqm Asail

105

J/29 m/o

One Design

CONTROL

Masthead, outboard version

111

J29 f/o

One Design

J29MO

Fractional outb'd, 12.5' SPL, 163% genoa

114

J29 f/o

PHRF Base

J29MO

Fractional outb'd, 11.5' SPL,

120

J29

Add 6 s/m to equivalent outboard version

J34c

5.4' draft, aluminum rig

J29MO

UFO keel

114

J34 IOR

3/4 tonner, aluminum rig

J29MO

Inside IOR lead forward of bkhd removed

114

J/80

PHRF base, aluminum rig

J29MO

6.5' sprit, rf, 65 sqm Asail

114

J/80

One Design, aluminum rig

J29MO

6.5' sprit, rf, 65 sqm Asail

120

J/27

One Design, aluminum rig

J29MO

120

J/32

6.0' draft, aluminum rig

J30OD

No Sprit, rf, 70 sqm Asail

126

J/32

4.75' draft

J30OD

No Sprit, rf, 70 sqm Asail

132

J/30

One Design

CONTROL

163% genoa, 12.5' Pole, 22.5' SMW

138

J/30

PHRF Base

J30OD

11.5' pole

144

J/28

5.0' draft, aluminum rig

J24OD

171

J/24

One Design

CONTROL

171

J/22

PHRF Base

J24OD

9.0' SPL

177

J/22

One Design

J24OD

9.0' SPL, class jib

183