PY Look Alike

SCHRS is the principal handicapping system recognized by World Sailing for cat on cat racing. Where monohulls and catamarans race together in the UK, 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 Technical Committee 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. In 2026, the conversion formula is modified to SCHRS x 666 = 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.pyonline.org.uk, strengthening both schemes. For advice on dual scoring use scoring software help systems or contact RYA Technical and Racing Services.

PY Look Alike 2026

CLASS

Ratings
2026

CREW

Portsmouth
Yardstick

PY
Look
Alike

2Win Sonic

1.310

2

 

872

2Win Sonic Solo

1.288

1

 

858

2Win Twincat 13 (without
spi)

1.541

2

 

1026

2Win Twincat 15 Sport

1.256

2

 

836

2Win Tyka

1.400

2

 

932

A-Class Foils

0.981

1

 

653

A-Classic (straight or
constant curve foils)

1.025

1

 

683

AHPC Capricorn F18

1.000

2

 

666

AHPC Taipan 4.9

1.107

2

 

737

AHPC Taipan 4.9 Spinnaker

1.043

2

 

695

AHPC Taipan 4.9 Solo

1.139

1

 

759

AHPC Taipan 4.9 Solo
Spinnaker

1.054

1

 

702

Alado 18 Aileron

1.099

2

 

732

Alado 18 F18

1.000

2

 

666

Bim 16 Double Spinnaker

1.174

2

 

782

Bim 16 Javelin 16 Solo
Spinnaker

1.042

1

 

694

Bim 16 Javelin Double
Spinnaker

1.134

2

 

755

Bim 18 Class A (>100
Kgs)

1.114

1

 

742

Bim 18 Double

1.081

2

 

720

Bim 18 Double Sloop

1.063

2

 

708

Bim 20

1.038

2

 

691

Bim Javelin 18 Hightech

1.030

2

 

686

Bim Javelin 2 (not 18HT)

1.056

2

 

703

Bimare X16 Double Spinnaker

1.143

2

 

761

Bimare X16 Solo (No spi.)

1.132

1

 

754

Bimare X16 Solo Spinnaker

1.064

1

 

709

Bimare X16FPlus

1.045

2

 

696

Bimare F16

1.038

2

 

691

Bimare X4 F18

1.000

2

 

666

Blade 16 Double light (WS
< 123 kgs)

1.016

2

 

677

Blade 16 Solo light (WS<
119 kgs)

1.017

1

 

677

C 4.8

1.320

2

 

879

C 4.8 Major

1.281

2

 

853

Catapult

1.294

1

 

862

Cirrus 16 Q F 16

1.042

2

 

694

Cirrus 16 Q Solo F16

1.062

1

 

707

Cirrus B1 F18

1.000

2

 

666

Cirrus Ecole

1.114

2

 

742

Cirrus Energy Regate

1.127

2

 

751

Cirrus Energy Regate Solo

1.156

1

 

770

Cirrus Evolution

1.053

2

 

701

Cirrus Evolution Solo

1.103

1

 

735

Cirrus F18

1.000

2

 

666

Condor 16

1.211

2

 

807

Dart 15

1.439

1

 

958

Dart 15 Sport double

1.431

2

 

953

Dart 15 Sport double
without trapeze

1.441

2

 

960

Dart 15 sport solo

1.305

1

 

869

Dart 16

1.333

2

 

888

Dart 16 X Race Spinnaker

1.251

2

 

833

Dart 18

1.240

2

 

826

Dart 18 Cat Boat

1.256

1

 

836

Dart 18 Spinnaker

1.184

2

 

789

Dart 20

1.123

2

 

748

Dart 20 TSX

1.132

2

 

754

Dart 20 TSX Spinnaker

1.084

2

 

722

Dart 6000

1.143

2

 

761

Dart Hawk F18

1.000

2

 

666

Dart Sting Double

1.377

2

 

917

Dart Sting Solo (with jib)

1.285

1

 

856

Dart Sting Solo (without
jib)

1.394

1

 

928

Diam 3 F18

1.000

2

 

666

Drake

1.039

2

 

692

Falcon F16 Double

1.035

2

 

689

Falcon F16 Cat Boat

1.053

1

 

701

Falcon 16 Double light
(WS<123 kgs)

1.016

2

 

677

Falcon 16 Solo light
(WS<119 kgs)

1.017

1

 

677

Flying Phantom

0.903

2

 

601

Flying Phantom Essentiel

0.957

2

 

637

Flying Phantom Essentiel
(with side racks)

0.950

2

 

633

Formula 16 Double

1.031

2

 

687

Formula 16 Solo

1.043

1

 

695

Formula 18

1.000

2

 

666

Goodall C2 F18

1.000

2

 

666

Goodall Viper Double

1.045

2

 

696

Goodall Viper Solo

1.058

1

 

705

Goodall Viper Foiling

0.997

2

 

664

Gwynt 14

1.265

2

 

842

Hawke Surfcat 7020

1.324

1

 

882

Hawke Surfcat 7020 (main
only)

1.509

1

 

1005

Hobie 13

1.620

2

 

1079

Hobie 14

1.448

1

 

964

Hobie 14 Race (with jib)

1.314

1

 

875

Hobie 15

1.337

2

 

890

Hobie 15 Spinnaker

1.248

2

 

831

Hobie 16

1.227

2

 

817

Hobie 16 Easy

1.334

2

 

888

Hobie 16 Spinnaker

1.160

2

 

773

Hobie 17 (without wings)

1.242

1

 

827

Hobie 17 (with wings)

1.228

1

 

818

Hobie 18

1.117

2

 

744

Hobie 18 Formula

1.108

2

 

738

Hobie 18 Formula Spinnaker

1.044

2

 

695

Hobie 18 Formula 104

1.070

2

 

713

Hobie 18 Magnum (with
wings)

1.121

2

 

747

Hobie 18 SX

1.137

2

 

757

Hobie 20 Formula

1.095

2

 

729

Hobie 20 Formula Spinnaker

1.023

2

 

681

Hobie 21

1.013

2

 

675

Hobie 21 Spinnaker

0.953

2

 

635

Hobie 21 Spinnaker (3 Crew)

0.992

3

 

661

Hobie 21 Formula

0.953

2

 

635

Hobie Advance

1.554

2

 

1035

Hobie Catsy

2.163

2

 

1441

Hobie Dragoon Club

1.512

2

 

1007

Hobie Dragoon Xtrem

1.428

2

 

951

Hobie Fox F20

0.976

2

 

650

Hobie FX One Cat Boat

1.096

1

 

730

Hobie FX One Double

1.056

2

 

703

Hobie FX Xtrem

1.057

2

 

704

Hobie Getaway (Without side
benches)

1.296

2

 

863

Hobie Getaway

1.273

1

 

848

Hobie Max

1.147

2

 

764

Hobie Max Youth

1.159

2

 

772

Hobie Pacific (no spinnaker
no wings)

1.166

2

 

777

Hobie Pacific (spinnaker no
wing)

1.105

2

 

736

Hobie cat T1

1.492

2

 

994

Hobie cat T1 Spinnaker

1.416

2

 

943

Hobie Teddy

1.616

3

 

1076

Hobie Tiger F18

1.000

2

 

666

Hobie Twixxy

1.449

3

 

965

Hobie Wave

1.543

2

 

1028

Hobie Wildcat F18

1.000

2

 

666

Hurricane 4.9

1.168

2

 

778

Hurricane 5.5

1.060

2

 

706

Hurricane 5.9

1.076

2

 

717

Hurricane 5.9 Spinnaker

1.014

2

 

675

Hurricane 5.9 Sport

1.033

2

 

688

Hurricane 5.9 SX

1.037

2

 

691

Hurricane 500

1.216

2

 

810

Hurricane 500 Spinnaker

1.118

2

 

745

IFLY 15 Solo

1.123

1

 

748

IFLY 15 Solo (with code F)

1.084

1

 

722

IFLY 15 Double

1.207

2

 

804

IFLY 15 Double (with code
F)

1.164

2

 

775

IFLY RAZZOR Solo

1.079

1

 

719

IFLY RAZZOR Solo, Code F

1.049

1

 

699

IFLY RAZZOR Double

1.150

2

 

766

IFLY RAZZOR Double, Code F

1.116

2

 

743

KL 15.5 (SL15.5)

1.245

2

 

829

KL 16

1.187

2

 

791

KL 17 Power

1.159

2

 

772

KL 17 Regate

1.200

2

 

799

KL 17 Regate Spinnaker

1.135

2

 

756

KL 17.5 Tonic (without
spinnaker)

1.219

2

 

812

KL 18 Regate

1.107

2

 

737

KL Booster

1.147

2

 

764

KL Phoenix F18

1.000

2

 

666

L by Erplast

1.348

2

 

898

L by Erplast Spinnaker

1.277

2

 

850

M by Erplast

1.536

2

 

1023

M Race by Erplast

1.432

2

 

954

Magic F18

1.000

2

 

666

Mattia 14

1.504

2

 

1002

Mattia 16

1.266

2

 

843

Mattia 17

1.053

2

 

701

Mattia 18 (104)

1.141

2

 

760

Mattia 18 (104) Spinnaker

1.076

2

 

717

Mattia 18 F18

1.000

2

 

666

Mattia 18 Raid Spinnaker

1.034

2

 

689

Mattia 20

1.066

2

 

710

Mattia 20 Sloop

1.016

2

 

677

Mattia 20 Spinnaker

1.041

2

 

693

Mattia 20 Venti

1.029

2

 

685

Mattia Declic

1.244

2

 

829

Mattia Esse

1.102

2

 

734

Mattia Esse Solo

1.218

1

 

811

Mattia Esse Sport

1.053

2

 

701

Mattia Esse Sport Solo

1.099

1

 

732

Mattia Flash F18

1.000

2

 

666

Mattia Smile

1.154

2

 

769

Mattia Smile Sport

1.113

2

 

741

Miracle 20

1.028

2

 

685

Miracle 20 (without
spinnaker)

1.094

2

 

729

Mystere 2000  F20

0.999

2

 

665

Mystere 5.0

1.227

2

 

817

Mystere 5.0 Xl

1.171

2

 

780

Mystere 5.5 Fun

1.124

2

 

749

Mystere 5.5 Master

1.088

2

 

725

Mystere 5.5 Master
Spinnaker

1.031

2

 

687

Mystere 6.0

1.004

2

 

669

Mystere Twister F18

1.000

2

 

666

Nacra 15

1.113

2

 

741

Nacra 15 FCS

1.073

2

 

715

Nacra 15 One FCS

1.107

1

 

737

Nacra F16 One – curved foil

1.037

1

 

691

Nacra F16 double – curved
foil

1.022

2

 

681

Nacra F16 One

1.059

1

 

705

Nacra F16 double

1.043

2

 

695

Nacra 17 « C »
foils

1.002

2

 

667

Nacra 17 Olympic Class full
foiler

0.987

2

 

657

Nacra 18M2

1.117

1

 

744

Nacra F20 Carbon

0.891

2

 

593

Nacra 20 One Design

0.976

2

 

650

Nacra F18

1.000

2

 

666

Nacra 4.5

1.307

2

 

870

Nacra 4.5 Solo

1.361

1

 

906

Nacra 460

1.308

2

 

871

Nacra 460 Solo

1.343

1

 

894

Nacra 460 Solo Spinnaker

1.251

1

 

833

Nacra 460 Sport

1.228

2

 

818

Nacra 5.0 Cat Boat

1.289

1

 

858

Nacra 5.0 Double

1.193

2

 

795

Nacra 5.0 Double Spinnaker

1.140

2

 

759

Nacra 5.2

1.148

2

 

765

Nacra 5.2 Spinnaker

1.091

2

 

727

Nacra 5.5 Raid

1.115

2

 

743

Nacra 5.5 Raid Spinnaker

1.048

2

 

698

Nacra 5.5 SL

1.093

2

 

728

Nacra 5.5 SL Spinnaker

1.036

2

 

690

Nacra 5.7 Race

1.149

2

 

765

Nacra 5.7 Race Spinnaker

1.098

2

 

731

Nacra 5.8 Spinnaker

1.029

2

 

685

Nacra 500 Solo

1.262

1

 

840

Nacra 500 Solo Spinnaker

1.176

1

 

783

Nacra 500 Double

1.200

2

 

799

Nacra 500 Sport Spinnaker

1.131

2

 

753

Nacra 500 MKII School

1.205

2

 

803

Nacra 500 MKII School with
spinnaker

1.146

2

 

763

Nacra 500 MKII Sport

1.193

2

 

795

Nacra 500 MKII Sport with
spinnaker

1.134

2

 

755

Nacra 570 (without
spinnaker)

1.120

2

 

746

Nacra 570 Sport Spinnaker

1.055

2

 

703

Nacra 570 MKII

1.070

2

 

713

Nacra 580 (without
spinnaker)

1.088

2

 

725

Nacra 580 Sport Spinnaker

1.022

2

 

681

Nacra 6.0 Spinnaker

1.004

2

 

669

Nacra 6.0 Raid Spinnaker

1.016

2

 

677

Nacra 6.0 SE Spinnaker

0.991

2

 

660

Nacra Blast

1.194

2

 

795

Nacra F17 Sloop

1.058

2

 

705

Nacra F17 Solo

1.090

1

 

726

Nacra 18 FCS

0.966

2

 

643

Nacra F20 Carbon FCS

0.868

2

 

578

Nacra Infusion F18

1.000

2

 

666

Nacra Inter17 Xl Solo

1.208

1

 

805

Nacra Inter17 Xl Solo
Spinnaker

1.116

1

 

743

Nacra Inter 18 F18

1.000

2

 

666

Nacra Inter 20 F20

0.980

2

 

653

New Cat 14

1.438

2

 

958

New Cat 14 Spinnaker

1.366

2

 

910

New Cat F1

1.462

2

 

974

New Cat F1 Spinnaker

1.386

2

 

923

New Cat F2

1.506

2

 

1003

New Cat Swing

1.244

2

 

829

New Marine 16 Swing Cat
Boat

1.256

1

 

836

New Marine 16 Swing Double

1.203

2

 

801

Paper Tiger

1.360

1

 

906

Prindle 15

1.354

1

 

902

Prindle 16

1.273

2

 

848

Prindle 18

1.177

2

 

784

Prindle 18-2

1.118

2

 

745

Prindle 18-2 Spinnaker

1.061

2

 

707

Prindle 19

1.091

2

 

727

Prindle 19 Spinnaker

1.021

2

 

680

Prindle 19 Pacer

1.109

2

 

739

Prindle 19 Pacer spinnaker

1.027

2

 

684

Prindle Play Cat

1.328

1

 

884

Raptor F16

1.025

2

 

683

RS Cat 14 XL Spinnaker

1.427

2

 

950

RS Cat 16 Club

1.403

1

 

934

RS Cat 16 S

1.376

2

 

916

RS Cat 16 XL

1.295

2

 

862

S9 Stunt Solo

1.122

1

 

747

Shadow

1.141

1

 

760

Shadow X

1.125

1

 

749

Shearwater

1.288

2

 

858

Shearwater Spinnaker

1.199

2

 

799

Shockwave F18

1.000

2

 

666

SL15.5 (KL15.5)

1.245

2

 

829

SL16

1.149

2

 

765

SL5.2

1.101

2

 

733

Spitfire Solo (without jib)

1.100

1

 

733

Spitfire

1.055

2

 

703

Spitfire S

1.051

2

 

700

Sprint 15 DX

1.256

1

 

836

Stealth F16 Double

1.014

2

 

675

Stealth F16 Solo

1.016

1

 

677

Stingray 5.5

1.055

2

 

703

Supercat 15 Solo

1.256

1

 

836

Supercat 15 Double

1.182

2

 

787

Supercat 17

1.107

2

 

737

Supercat 19

1.071

2

 

713

Supercat 20

0.998

2

 

665

Supercat 20 (tall rig)

0.963

2

 

641

Thundercat 18

1.107

2

 

737

Tomahawk F20

1.009

2

 

672

Topaz 14C

1.474

2

 

982

Topaz 14CX Spinnaker

1.397

2

 

930

Topaz 14Xtreme

1.299

1

 

865

Topaz 16C

1.347

2

 

897

Topaz 16CX

1.271

2

 

846

Topaz 16S

1.420

2

 

946

Topaz 16S Spinnaker

1.328

2

 

884

Topcat 4.5 Solo

1.263

1

 

841

Topcat Chico

1.798

2

 

1197

Topcat F1

1.396

1

 

930

Topcat F2

1.331

2

 

886

Topcat K1 Classic

1.184

2

 

789

Topcat K1 Streamcut

1.116

2

 

743

Topcat K1 Regatta Spinnaker

1.060

2

 

706

Topcat K2 Classic

1.213

2

 

808

Topcat K2 Streamcut Regatta

1.173

2

 

781

Topcat K2 Spinnaker

1.115

2

 

743

Topcat K2X Classic

1.207

2

 

804

Topcat K2X Streamcut

1.167

2

 

777

Topcat K2X Regatta Gennaker

1.103

2

 

734

Topcat K3 Classic

1.273

2

 

848

Topcat K3 Streamcut

1.232

2

 

821

Topcat K3 Regatta Spinnaker
(no jib)

1.166

2

 

777

Topcat K3X Solo Streamcut
Jib Spinnaker

1.076

1

 

717

Topcat K3X Solo Regatta
(with gennaker DS)

1.114

1

 

742

Topcat K4X Solo

1.370

1

 

913

Topcat K4X Classic (with
Jib)

1.382

2

 

920

Topcat K4x Streamcut (with
jib)

1.334

2

 

888

Topcat K4X (with reacher)

1.265

2

 

842

Topcat Spifire 2.3

1.148

2

 

765

Topcat Spitfire 2.5

1.144

2

 

762

Tornado

0.960

2

 

639

Tornado 24m2 Spinnaker

0.989

2

 

659

Tornado Classic

1.062

2

 

707

Tropic GTI

1.169

2

 

779

Tropic GTI Spinnaker

1.106

2

 

737

Unicorn

1.206

1

 

803

Ventilo 18

1.057

2

 

704

Ventilo 18 HT

1.030

2

 

686

Ventilo 609

0.980

2

 

653

Ventilo Quickie

1.045

1

 

696

Ventilo Zippo

1.082

2

 

721

Warp 18

1.170

2

 

779

Warp 18 Spinnaker

1.106

2

 

737

Whisper

0.960

2

 

639