Last Updated: March 2018

SCHRS is the principal handicapping system recognized by World Sailing 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 678 = 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 www.pys.org.uk. (external link) , strengthening both schemes. For advice on dual scoring use scoring software help systems or contact RYA Technical and Racing Services.

2Win Sonic1.285871
2Win Sonic Solo1.266858
2Win Twincat 13 without Spinnaker1.4921012
2Win Twincat 15 Sport1.233836
2Win Tyka1.377934
A-Class (Foils)0.973660684
A-Classic (straight/constant curve foils)1.002679
AHPC Capricorn F181678
AHPC Taipan 4.91.075729
AHPC Taipan 4.9 Spinnaker1.026696
AHPC Taipan 4.9 Solo1.097744
AHPC Taipan 4.9 Solo Spinnaker1.033700
Alado 18 Aileron1.088738
Alado 18 F18 1678
Bim 16 Double Spinnaker1.159786
Bim 16 Javelin 16 Solo Spinnaker1.023694
Bim 16 Javelin Double Spinnaker1.118758
Bim 18 Class A (>100 Kgs)1.08732
Bim 18 Double1.071726
Bim 18 Double Sloop1.046709
Bim 201.027696
Bim Javelin 18 Hightech1.011685
Bim Javelin 2 (not 18HT)1.042706
Bimare X16 Double Spinnaker1.123761
Bimare X16 Solo1.091740
Bimare X16 Solo Spinnaker1.041706
Bimare X16FPlus1.028697
Bimare F161.035702
Bimare X4 F181678
Blade 16 Double light (WS < 123 kgs)1.012686
Blade 16 Solo light (WS< 119 kgs)1.015688
C 4.81.285871
C 4.8 Major1.25848
Cirrus 16 Q F 161.039704
Cirrus 16 Q Solo F161.059718
Cirrus B1 F181678
Cirrus Ecole1.09739
Cirrus Energy Regate1.112754
Cirrus Energy Regate Solo1.144776
Cirrus Evolution1.04705
Cirrus Evolution Solo1.086736
Cirrus F181678
Condor 161.183802
Dart 161.301882
Dart 16 X Race Spinnaker1.235837
Dart 181.215824824
Dart 18 Cat Boat1.23834
Dart 18 Spinnaker1.169793
Dart 201.096743
Dart 20 TSX1.105749
Dart 20 TSX Spinnaker1.068724
Dart 60001.116757
Dart Hawk F181678
Dart Sting Double1.341909
Dart Sting Solo (with jib)1.254850
Dart Sting Solo (no jib)1.358921
Diam 3 F18 1678
Falcon F16 Double1.032700
Falcon F16 Cat Boat1.051713
Falcon 16 Double light (WS<123 kgs)1.012686
Falcon 16 Solo light (WS<119 kgs)1.015688
Flying Phantom0.895607
Flying Phantom Essentiel0.946641
Flying Phantom Essentiel side racks0.937635
Formula 16 Double1.028697
Formula 16 Solo1.041706
Formula 181678680
Goodall C2 F181678
Goodall Viper Double1.04705
Goodall Viper Solo1.056716
Gwynt 141.25848
Hawke Surfcat 70201.291875
Hawke Surfcat 7020 main only1.463992
Hobie 131.5781070
Hobie 141.405953
Hobie 14 race (with jib)1.278866
Hobie 151.302883
Hobie 161.193809
Hobie 16 Easy1.294877
Hobie 16 Spinnaker 1.143775
Hobie 17 (without wings)1.21820
Hobie 17 (with wings)1.196811
Hobie 181.091740
Hobie 18 Formula1.082734
Hobie 18 Formula Spinnaker1.032700
Hobie 18 Formula 1041.059718
Hobie 18 Magnum (with wings)1.093741
Hobie 18 SX1.11753
Hobie 20 Formula1.011685
Hobie 210.99671
Hobie 21 Spinnaker0.944640
Hobie 21 Spinnaker (3 Crew)0.981665
Hobie 21 Formula0.943639
Hobie Advance1.521031
Hobie Catsy2.0921418
Hobie Dragoon Club1.4751000
Hobie Dragoon Xtrem1.409955
Hobie Fox F200.962652
Hobie FX One Cat Boat1.084735
Hobie FX One Double1.043707
Hobie FX Xtrem1.045709
Hobie Getaway1.242842
Hobie Max1.132767
Hobie Max Youth1.143775
Hobie Pacific (no Spinnaker no wings)1.132767
Hobie pacific (Spinnaker no wings)1.087737
Hobie Cat T1 1.44976
Hobie Cat T1 Spinnaker1.386940
Hobie Teddy1.5791071
Hobie Tiger F181678
Hobie Twixxy1.43970
Hobie Wave1.4921012
Hobie Wildcat F181678
Hurricane 4.91.14773
Hurricane 5.51.049711
Hurricane 5.9 1.051713
Hurricane 5.9 Spinnaker1.003680
Hurricane 5.9 Sport1.021692
Hurricane 5.9 SX1.02692695
Hurricane 5001.187805
Hurricane 500 Spinnaker1.107751
KL 15.5 - SL15.51.225831
KL 161.172795
KL 17 Power1.145776
KL 17 Regate1.169793
KL 17 Regate Spinnaker1.121760
KL 17.5 Tonic (without Spinnaker)1.19807
KL 18 Regate1.094742
KL Booster1.132767
KL Phoenix F181678
M by Erplast1.491010
M Race by Erplast1.406953
Magic F181678
Mattia 141.4821005
Mattia 161.246845
Mattia 171.036702
Mattia 18 (104)1.113755
Mattia 18 (104) Spinnaker1.064721
Mattia 18 F181678
Mattia 18 Raid Spinnaker1.023694
Mattia 201.042706
Mattia 20 Sloop1.005681
Mattia 20 Spinnaker1.031699
Mattia 20 Venti1.018690
Mattia Declic1.224830
Mattia Esse1.09739
Mattia Esse Solo1.188805
Mattia Esse Sport1.038704
Mattia Esse Sport Solo1.084735
Mattia Flash F181678
Mattia Smile1.13766
Mattia Smile Sport1.093741
Miracle 201.017690
Miracle 20 (without Spinnaker)1.068724
Mystere 2000 F201678
Mystere 5.01.198812
Mystere 5.0 Xl1.143775
Mystere 5.5 Fun1.095742
Mystere 5.5 Master1.059718
Mystere 5.5 Master Spinnaker1.016689
Mystere 6.00.989671
Mystere Twister F181678
Nacra 151.091740
Nacra 16 Solo curved foils1.045709
Nacra 16 Double curved foils 1.022693
Nacra 16 Solo1.062720
Nacra 16 Double1.038704
Nacra 17 "C" foils0.991672
Nacra 17 Olympic Class full foiler0.973660
Nacra 18m21.093741
Nacra F20 Carbon0.877595
Nacra 20 One Design0.96651
Nacra F181678
Nacra 4.51.273863
Nacra 4.5 Solo1.326899
Nacra 4601.271862
Nacra 460 Solo1.304884
Nacra 460 Solo Spinnaker1.236838
Nacra 460 Sport1.209820
Nacra 5.0 Cat Boat1.256852
Nacra 5.0 Double1.165790
Nacra 5.0 Double Spinnaker1.125763
Nacra 5.21.121760
Nacra 5.2 Spinnaker1.077730
Nacra 5.5 Raid1.088738
Nacra 5.5 Raid Spinnaker1.038704
Nacra 5.5 SL1.068724
Nacra 5.5 SL Spinnaker1.025695
Nacra 5.7 Race1.122761
Nacra 5.7 Race Spinnaker1.084735
Nacra 5.8 Spinnaker1.02692
Nacra 500 Solo1.229833
Nacra 500 Solo Spinnaker1.165790
Nacra 500 Double1.171794
Nacra 500 Sport Spinnaker1.119759
Nacra 570 (without Spinnaker)1.088738
Nacra 570 Sport Spinnaker1.04705
Nacra 580 (without Spinnaker)1.057717
Nacra 580 Sport Spinnaker1.012686
Nacra 6.0 Spinnaker0.993673
Nacra 6.0 Raid Spinnaker1.007683
Nacra 6.0 SE Spinnaker0.98664
Nacra Blast1.179799
Nacra F17 Sloop1.043707
Nacra F17 Solo1.071726
Nacra F20 Carbon FCS0.856580
Nacra Infusion F181678
Nacra Inter17 Xl Solo 1.178799
Nacra Inter17 Xl Solo Spinnaker1.108751
Nacra Inter 18 F181678
Nacra Inter 20 F200.97658
New Cat F11.424965
New Cat F21.467995
New Cat Swing1.23834
New Marine 16 Swing Cat Boat1.25848
New Marine 16 Swing Double1.192808
Paper Tiger1.325898
Prindle 151.314891
Prindle 161.236838
Prindle 181.149779
Prindle 18-21.089738
Prindle 18-2 Spinnaker1.046709
Prindle 191.065722
Prindle 19 Spinnaker1.012686
Prindle 19 Pacer1.082734
Prindle 19 Pacer Spinnaker1.018690
Prindle Play Cat1.294877
Raptor F161.023694
RS Cat 16 Club1.359921
RS Cat 16 S1.333904
RS Cat 16 XL1.273863
S9 Stunt Solo1.107751
Shadow X1.113755
Shearwater Spinnaker1.187805
Shockwave F181678
SL 15.5 - KL15.51.225831
SL 161.14773
SL 5.21.081733
Spitfire S1.033700
Sprint 15 Cat Boat1.402951927
Sprint 15 DX1.215824
Sprint 15 GTI1.394945
Sprint 15 Sport Solo1.274864904
Stealth F16 Double1.011685
Stealth F16 Solo1.014687
Stingray 5.51.026696
Supercat 15 Solo1.217825
Supercat 15 Double1.154782
Supercat 17 1.081733
Supercat 191.046709
Supercat 200.974660
Supercat 20 Tall rib0.94637
Thundercat 181.078731
Tomahawk F200.991672
Topaz 14C1.429969
Topaz 14CX Spinnaker1.372930
Topaz 14Xtreme1.274864
Topaz 16C1.31888
Topaz 16CX1.253850
Topaz 16S1.378934
Topaz 16S Spinnaker1.309888
Topcat 4.5 Solo1.224830
Topcat Chico1.7511187
Topcat F11.36922
Topcat F21.299881
Topcat K1 Classic1.156784
Topcat K1 Streamcut1.085736
Topcat K1 Regatta Spinnaker1.043707
Topcat K2 Classic1.184803
Topcat K2 Streamcut Regatta1.14773
Topcat K2 Spinnaker1.096743
Topcat K3 Classic1.24841
Topcat K3 Streamcut1.194810
Topcat K3 Regatta Spinnaker (no jib)1.145776
Topcat K3 Solo (no jib)1.229833
Topcat K3 Solo Regatta Spinnaker (no jib)1.17793
Topcat K4X Classic1.337906
Topcat K4x Streamcut1.289874
Topcat K4X Spinnaker1.241841
Topcat Spifire 2.31.121760
Topcat Spitfire 2.51.117757
Tornado 0.949643
Tornado 24m2 Spinnaker0.98664
Tornado Classic1.037703
Tropic GTI1.141774
Tropic GTI Spinnaker1.094742
Ventilo 181.043707
Ventilo 18 HT1.011685
Ventilo 6090.966655
Ventilo M3 Cat Boat Spinnaker0.981665
Ventilo Quickie1.021692
Ventilo Zippo1.065722
Warp 181.136770
Warp 18 Spinnaker1.088738
Whisper 0.947642

Class names including * have a provisional rating.