Last Updated: July 2014

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 Solo1.258849
2Win Twincat 15 Sport1.228829
2Win Tyka1.376929
A Class 1.002676681
AHPC C2 F181675
AHPC Capricorn F18 1675
AHPC Taipan 4.91.017686
AHPC Viper1.035699
AHPC Viper Solo1.058714
Alado 18 Aileron1.091736
Alado 18 F18 1675
Bim 161.155780
Bim 18 Class A (>100 Kgs)1.09736
Bim 18 Double1.071723
Bim 18 Double Sloop1.047707
Bim 201.03695
Bimare X16 Double Spinnaker1.115753
Bimare X16 Solo1.095739
Bimare X16 Solo Spinnaker1.049708
Bimare X4 F181675
Bimare X16FPlus1.022690
C 4.81.286868
C 4.8 Major1.255847
Cirrus 16 Q F 161.032697
Cirrus 16 Q solo F161.056713
Cirrus B11675
Cirrus Ecole1.092737
Cirrus Energy Regate1.112751
Cirrus Energy Regate Solo1.141770
Cirrus Evolution1.039701
Cirrus Evolution Solo1.084732
Cirrus F18 1675
Condor 161.182798
Dart 161.287869910
Dart 16 X Race1.233832
Dart 181.217821805
Dart 18 Cat Boat1.264853
Dart 18 Spinnaker1.178795
Dart 201.109749
Dart 60001.136767
Dart Hawk F181675
Dart Sting1.355915
Dart Sting Cat Boat1.365921
Dart Sting Solo1.259850
Dart TSX1.057713
Diam 3 F18 1675
Falcon F16 - 2 crew1.028694
Falcon F16 - cat boat1.052710
Formula 16 - 2 crew1.002676
Formula 16 - cat boat1.019688
Formule 181675693
Gwynt 141.254846
Hawke Surfcat 70201.321892
Hawke Surfcat 7020 (Main Only)1.471993
Hobie 131.591073
Hobie 14 LE1.398944
Hobie 14 Turbo1.27857
Hobie 151.305881
Hobie 16 LE (without spinnaker)1.197808
Hobie 16 Spinnaker1.145773
Hobie 17 (with wings)1.212818
Hobie 181.098741
Hobie 18 Formula1.039701
Hobie 18 Formula 1041.072724
Hobie 18 Magnum1.098741
Hobie 18 SX1.122757
Hobie 20 Formula1.027693
Hobie 21 (2 Crew)0.976659
Hobie 21 (3 Crew)1.013684
Hobie 21 Formula0.978660
Hobie Advance1.5571051
Hobie Catsy2.0471382
Hobie Dragoon Club1.458984
Hobie Dragoon Xtrem1.416956
Hobie Fox F200.964651
Hobie FX One Cat Boat1.064718
Hobie FX One Double1.044705
Hobie FX Xtrem1.044705
Hobie Getaway1.243839
Hobie Max1.126760
Hobie Max Youth1.145773
Hobie Pacific1.074725
Hobie Pacific (with wings)1.098741
Hobie Teddy1.6111087
Hobie Tiger F181675
Hobie Twixxy1.451979
Hobie Wave1.5221027
Hobie Wildcat F181675
Hurricane 4.91.153778
Hurricane 5.51.054711
Hurricane 5.91.06716699
Hurricane 5.9 Sport1.026693
Hurricane 5.9 SX1.02689
Hurricane 5001.112751
Javelin 161.102744
Javelin 18HT1.035699
Javelin 2 (not 18HT)1.04702
KL 15.51.228829
KL 161.173792
KL 17 Power1.144772
KL 17 Regate1.119755
KL 17.5 Tonic (without spinnaker)1.187801
KL 18 Regate1.098741
KL Booster1.134765
KL Phoenix F181675
M20 Vampire Duo0.848572
Magic F181675
Mattia 141.473994
Mattia 161.247842
Mattia 171.035699
Mattia 18 1041.07722
Mattia 18 F181675
Mattia 18 Raid1.035699
Mattia 201.014684
Mattia 20 Cat Boat1.021689
Mattia 20 Sloop1.013684
Mattia 20 Venti1.027693
Mattia Declic1.225827
Mattia Esse1.092737
Mattia Esse Solo1.185800
Mattia Esse Sport1.039701
Mattia Esse Sport Solo1.085732
Mattia Flash F181675
Mattia Smile1.133765
Mattia Smile Sport1.097740
Miracle 201.023691
Miracle 20 (without spinnaker)1.071723
Mystere 2000 F201675
Mystere 5.01.198809
Mystere 5.0 Xl1.132764
Mystere 5.5 Fun1.079728
Mystere 5.5 Master1.022690
Mystere 6.00.992670
Mystere Twister F181675
Nacra 161.025692
Nacra 16 single handed1.049708
Nacra F160.996672
Nacra F16 single handed1.02689
Nacra 170.973657
Nacra 18M21.096740
Nacra 20 Carbon0.86581
Nacra 20 One Design0.961649
Nacra 2005 F181675
Nacra 4.51.278863
Nacra 4.5 Solo1.323893
Nacra 4601.269857
Nacra 460 Solo1.293873
Nacra 460 Solo Spinnaker1.234833
Nacra 460 Sport1.215820
Nacra 5.01.137767
Nacra 5.0 Cat Boat1.253846
Nacra 5.21.082730
Nacra 5.5 France SL1.036699
Nacra 5.5 Raid1.045705
Nacra 5.7 Race1.088734
Nacra 5.81.022690
Nacra 5001.168788
Nacra 500 Sport1.12756
Nacra 500 Solo1.221824
Nacra 500 Solo Spinnaker1.162784
Nacra 570 (without spinnaker)1.085732
Nacra 570 Sport1.036699
Nacra 580 (without spinnaker)1.056713
Nacra 580 Sport1.005678
Nacra 6.01.009681
Nacra 6.0 Raid1.016686
Nacra 6.0 SE0.983664
Nacra Blast1.188802
Nacra F17 Sloop1.044705
Nacra F17 Solo1.076726
Nacra Infusion F181675
Nacra Inter 17 Solo (without spinnaker)1.172791
Nacra Inter 17 Solo Spinnaker 19M21.105746
Nacra Inter 18 F181675
Nacra Inter 20 F200.972656
New Cat F11.411952
New Cat F21.449978
New Cat Swing1.236834
New Marine 12 Junior Cat Boat1.7591187
New Marine 12 Junior Double1.8511249
New Marine 12 Racing Cat Boat1.6251097
New Marine 12 Racing Double1.711154
New Marine 16 Swing Cat Boat1.252845
New Marine 16 Swing Double1.198809
Prindle 151.297875
Prindle 161.223826
Prindle 181.143772
Prindle 18.21.052710
Prindle 191.027693
Prindle 19 Pacer1.029695
Prindle Play Cat1.293873
Raptor F161.018687
Shadow X1.108748
Shockwave F181675
SL 15.51.228829
SL 161.145773
SL 5.21.08729
Spitfire S1.035699
Sprint 15 Cat Boat1.403947933
Sprint 15 DX1.206814
Sprint 15 GTI1.397943
Sprint 15 Sport Solo1.274860860
Stealth R1.015685
Stealth R Solo1.067720
Stingray 5.51.019688
Thundercat 181.045705
Tomahawk F200.992670
Topaz 14C1.417956
Topaz 14CX Spinnaker1.37925
Topaz 14Xtreme1.267855
Topaz 16C1.305881
Topaz 16CX1.255847
Topaz 16S1.368923
Topaz 16S Spinnaker1.31884
Topcat 15 F21.293873
Topcat 15 Solo1.305881
Topcat 18 K11.065719
Topcat 18 Spitfire (without spinnaker)1.147774
Topcat 4.51.212818
Topcat Chico1.6681126
Topcat F11.289870
Topcat F21.24837
Topcat K11.037700
Topcat K21.108748
Topcat K31.15776
Topcat K3 Solo1.178795
Topcat Spifire 2.31.122757
Topcat Spifire 2.51.09736
Tornado 24m2 Spinnaker0.989668
Tornado Classic1.047707
Tropic GTI1.098741
Ventilo 181.043704
Ventilo 18 HT1.016686
Ventilo 20 CB0.979661
Ventilo 6090.959647
Ventilo Quickie1.029695
Ventilo Zippo1.062717
Warp 181.076726
Provisional ratings for new classes
RS Cat 16 S1.322892
RS Cat 16 Club1.342906
RS Cat 16 XL1.270857
Provisional ratings for foilers, subject to review
Nacra 20 Foiler0.805543
Flying Phantom Foiler0.836564
Vampire Foiler0.783529