Last Updated: February 2015

SCHRS is the principal handicapping system recognized by ISAF for cat on cat racing. Where monohulls and catamarans race together, Portsmouth Yardstick (PY) ratings are commonly used. The PY Look Alike ratings below are provided to enable catamarans without official PY Ratings to compete.

The Portsmouth Yardstick Committee and SCHRS World Council have agreed a conversion factor that may be applied to any make, model and configuration of catamaran for which an SCHRS rating has been approved by SCHRS so that it may be raced under the Portsmouth Yardstick. The conversion formula is SCHRS x 675 = PY and is shown in the column headed PY LOOK ALIKE.

To strengthen the SCHRS to PY conversion factor, UK clubs are encouraged to provide data to the RYA for all races in which catamarans compete. If such races are initially scored under SCHRS, sailing scoring programs such as Sailwave or HAL Race Results are capable of dual scoring under a second system such as PY. This would allow for results to be considered under both SCHRS and PY and the results of PY Racing to be simply uploaded direct to (external link) , strengthening both schemes. For advice on dual scoring use scoring software help systems or contact RYA Technical and Racing Services.

2Win Sonic1.283866
2Win Sonic Solo1.259850
2Win Twincat 15 Sport1.231831
2Win Tyka1.375928
A Class Classic1.002676681
A Class flying0.970655
AHPC C2 F181.000675
AHPC Capricorn F18 1.000675
AHPC Taipan 4.91.012683
AHPC Viper1.035699
AHPC Viper Solo1.051709
Alado 18 Aileron1.090736
Alado 18 F18 1.000675
Bim 161.155780
Bim 18 Class A (>100 Kgs)1.078728
Bim 18 Double1.071723
Bim 18 Double Sloop1.045705
Bim 201.029695
Bimare X16 Double Spinnaker1.119755
Bimare X16 Solo1.083731
Bimare X16 Solo Spinnaker1.036699
Bimare X16FPlus1.022690
Bimare X4 F181.000675
C 4.81.281865
C 4.8 Major1.250844
Cirrus 16 Q F 161.035699
Cirrus 16 Q solo F161.055712
Cirrus B11.000675
Cirrus Ecole1.090736
Cirrus Energy Regate1.111750
Cirrus Energy Regate Solo1.141770
Cirrus Evolution1.038701
Cirrus Evolution Solo1.084732
Cirrus F18 1.000675
Condor 161.178795
Dart 161.286868910
Dart 16 X Race1.232832
Dart 181.217821814
Dart 18 Cat Boat1.261851
Dart 18 Spinnaker1.173792
Dart 201.104745
Dart 60001.134765
Dart Hawk F181.000675
Dart Sting1.350911
Dart Sting Cat Boat1.359917
Dart Sting Solo1.255847
Dart TSX1.053711
Diam 3 F18 1.000675
Falcon F16 - 2 crew1.027693
Falcon F16 - cat boat1.048707
Flying Phantom Foiler0.878593
Formula 16 - 2 crew1.003677
Formula 16 - cat boat1.009681
Formule 181.000675693
Gwynt 141.250844
Hawke Surfcat 70201.300878
Hawke Surfcat 7020 (Main Only)1.465989
Hobie 131.5841069
Hobie 14 LE1.397943
Hobie 14 Turbo1.268856
Hobie 151.300878
Hobie 16 LE (without spinnaker)1.196807
Hobie 16 Spinnaker1.144772
Hobie 17 (with wings)1.208815
Hobie 181.094738
Hobie 18 Formula1.035699
Hobie 18 Formula 1041.067720
Hobie 18 Magnum1.094738
Hobie 18 SX1.117754
Hobie 20 Formula1.023691
Hobie 21 (2 Crew)0.952643
Hobie 21 (3 Crew)0.989668
Hobie 21 Formula0.957646
Hobie Advance1.5531048
Hobie Catsy2.0391376
Hobie Dragoon Club1.457983
Hobie Dragoon Xtrem1.414954
Hobie Fox F200.965651
Hobie FX One Cat Boat1.081730
Hobie FX One Double1.044705
Hobie FX Xtrem1.043704
Hobie Getaway1.238836
Hobie Max1.125759
Hobie Max Youth1.144772
Hobie Pacific1.076726
Hobie Pacific (with wings)1.098741
Hobie Teddy1.6081085
Hobie Tiger F181.000675
Hobie Twixxy1.450979
Hobie Wave1.5001013
Hobie Wildcat F181.000675
Hurricane 4.91.148775
Hurricane 5.51.050709
Hurricane 5.91.056713
Hurricane 5.9 Sport1.022690
Hurricane 5.9 SX1.020689699
Hurricane 5001.108748
Javelin 161.103745
Javelin 18HT1.021689
Javelin 2 (not 18HT)1.040702
KL 15.51.227828
KL 161.172791
KL 17 Power1.143772
KL 17 Regate1.117754
KL 17.5 Tonic (without spinnaker)1.186801
KL 18 Regate1.097740
KL Booster1.133765
KL Phoenix F181.000675
Magic F181.000675
Mattia 141.468991
Mattia 161.242838
Mattia 171.035699
Mattia 18 1041.066720
Mattia 18 F181.000675
Mattia 18 Raid1.031696
Mattia 201.012683
Mattia 20 Cat Boat1.021689
Mattia 20 Sloop1.009681
Mattia 20 Venti1.023691
Mattia Declic1.220824
Mattia Esse1.091736
Mattia Esse Solo1.185800
Mattia Esse Sport1.039701
Mattia Esse Sport Solo1.085732
Mattia Flash F181.000675
Mattia Smile1.131763
Mattia Smile Sport1.095739
Miracle 201.019688
Miracle 20 (without spinnaker)1.067720
Mystere 2000 F201.000675
Mystere 5.01.194806
Mystere 5.0 Xl1.132764
Mystere 5.5 Fun1.078728
Mystere 5.5 Master1.021689
Mystere 6.00.991669
Mystere Twister F181.000675
Nacra 161.019688
Nacra 16 single handed1.041703
Nacra 170.993670
Nacra 18M21.092737
Nacra 20 Carbon0.877592
Nacra 20 FCS0.839566
Nacra 20 One Design0.962649
Nacra 2005 F181.000675
Nacra 4.51.273859
Nacra 4.5 Solo1.318890
Nacra 4601.269857
Nacra 460 Solo1.294873
Nacra 460 Solo Spinnaker1.234833
Nacra 460 Sport1.215820
Nacra 5.01.132764
Nacra 5.0 Cat Boat1.249843
Nacra 5.21.078728
Nacra 5.5 France SL1.032697
Nacra 5.5 Raid1.041703
Nacra 5.7 Race1.084732
Nacra 5.81.018687
Nacra 5001.167788
Nacra 500 Sport1.119755
Nacra 500 Solo1.221824
Nacra 500 Solo Spinnaker1.162784
Nacra 570 (without spinnaker)1.086733
Nacra 570 Sport1.036699
Nacra 580 (without spinnaker)1.056713
Nacra 580 Sport1.004678
Nacra 6.01.005678
Nacra 6.0 Raid1.012683
Nacra 6.0 SE0.980662
Nacra Blast1.184799
Nacra F161.035699
Nacra F16 single handed1.058714
Nacra F17 Sloop1.044705
Nacra F17 Solo1.070722
Nacra Infusion F181.000675
Nacra Inter 17 Solo (without spinnaker)1.173792
Nacra Inter 17 Solo Spinnaker 19M21.105746
Nacra Inter 18 F181.000675
Nacra Inter 20 F200.972656
New Cat F11.406949
New Cat F21.443974
New Cat Swing1.235834
New Marine 12 Junior Cat Boat1.7521183
New Marine 12 Junior Double1.8441245
New Marine 12 Racing Cat Boat1.6191093
New Marine 12 Racing Double1.7031150
New Marine 16 Swing Cat Boat1.252845
New Marine 16 Swing Double1.197808
Prindle 151.296875
Prindle 161.222825
Prindle 181.129762
Prindle 18.21.045705
Prindle 191.006679
Prindle 19 Pacer1.025692
Prindle Play Cat1.288869
Raptor F161.018687
RS Cat 16 Club1.348910
RS Cat 16 S1.325894
RS Cat 16 XL1.273859
Shadow X1.108748
Shockwave F181.000675
SL 15.51.227828
SL 161.144772
SL 5.21.080729
Spitfire S1.036699
Sprint 15 Cat Boat1.397943933
Sprint 15 DX1.209816
Sprint 15 GTI1.392940
Sprint 15 Sport Solo1.269857890
Stealth R1.013684
Stealth R Solo1.061716
Stingray 5.51.019688
Thundercat 181.045705
Tomahawk F200.994671
Topaz 14C1.418957
Topaz 14CX Spinnaker1.371925
Topaz 14Xtreme1.269857
Topaz 16C1.304880
Topaz 16CX1.254846
Topaz 16S1.368923
Topaz 16S Spinnaker1.310884
Topcat 15 F21.292872
Topcat 15 Solo1.305881
Topcat 18 K11.065719
Topcat 18 Spitfire (without spinnaker)1.143772
Topcat 4.51.213819
Topcat Chico1.6621122
Topcat F11.291871
Topcat F21.240837
Topcat K11.036699
Topcat K21.106747
Topcat K31.149776
Topcat K3 Solo1.173792
Topcat Spifire 2.31.117754
Topcat Spifire 2.51.090736
Tornado 24m2 Spinnaker0.985665
Tornado Classic1.043704
Tropic GTI1.094738
Ventilo 181.043704
Ventilo 18 HT1.013684
Ventilo 20 CB0.984664
Ventilo 6090.965651
Ventilo Quickie1.018687
Ventilo Zippo1.062717
Warp 181.075726
Provisional ratings for new classes
Nacra 151.088734