Club
Certificate
2023

Boat

THUNDER

USA 18431

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Rated boat velocities in knots
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Beat Angles42.3°39.9°37.8°37.0°36.4°36.6°36.9°
Beat VMG3.844.605.025.195.295.355.37
52°5.776.657.067.227.317.367.41
60°6.026.827.217.397.487.547.60
75°6.176.927.337.577.727.827.94
90°6.016.867.327.637.878.078.30
110°5.726.837.427.808.118.368.87
120°5.566.707.357.798.198.569.30
135°5.006.207.027.527.958.399.49
150°4.205.346.307.037.497.898.75
Run VMG3.644.625.466.196.777.268.02
Gybe Angles143.3°146.9°150.2°157.3°167.3°177.2°177.2°

APH: 544.2

CDL: 9.511

GPH: 606.9

CertNo: 18431

BOAT
ClassEXPRESS 37DesignerSCHUMACHERBuilderALSBERG BROSAge date01/1986Series date01/1984Offset fileUS18631A.offData fileUSA18431
HULL
Length Overall11.305 mMaximum Beam3.530 mDraft2.227 mDisplacement4,878 kgDLR6.0137IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeFolding 2 bladesDiameter0.420m
CREW
Maximum weight754 kgMinimum weight566 kg * when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail32.1932.78Headsail Luffed51.1251.12Headsail FlyingSymmetric102.87102.87Asymmetric100.29100.29 (1 asymmetric(s) with SHW/SFL < 85%)
STORM SAIL AREAS (m²)
Trysail9.44Storm Jib11.11Heavy Weather Jib29.99
SAIL LIMITS
Headsails5  Spinnakers4 * Asymmetric may be tacked on the pole
STABILITY
Righting MomentN/AStability IndexN/A
The owner and any other person in charge is responsible that boat is complying with her certificate in accordance with RRS 78.1 and ORC Rule 304.
ORC Ref  04560002Q2CIssued on 11/07/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

THUNDER

USA 18431

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Time Allowances in secs/NM
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Beat VMG938.6782.6717.8693.1680.7672.9669.8
52°623.8541.3509.8498.6492.7489.2485.9
60°597.6527.5499.0487.3481.2477.5473.4
75°583.7519.9491.4475.3466.2460.2453.5
90°599.1524.7491.9472.1457.4446.3433.6
110°629.2526.8485.5461.8443.8430.5406.1
120°647.7537.3489.8461.9439.6420.3387.0
135°720.4580.5512.6478.4452.8429.0379.3
150°856.8674.8571.3512.2480.3456.2411.4
Run VMG989.4779.1659.6582.0532.1495.7448.8
Selected Courses
Windward / Leeward964.0780.9688.7637.6606.4584.3559.3
All purpose744.7618.7559.5528.0508.5494.1473.2
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward663.00.9050
All purpose544.21.1026
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.8147
Downwind "popa"0.9361
70% up, 30% down "Ilhabela"0.8476
30% up, 70% down "Ilhabela-inverso"0.8960
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Predominantly Upwind582.31.0304
Predominantly Downwind555.31.0805
Custom scoring options for Canada
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low681.70.8801
Triple Number All Purpose Medium541.21.1087
Triple Number All Purpose High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Predominantly Upwind582.31.0304
Predominantly Downwind555.31.0805
Predominantly Upwind Low740.70.8100
Predominantly Upwind Medium598.61.0024
Predominantly Upwind High569.31.0539
Predominantly Downwind Low759.30.7902
Predominantly Downwind Medium554.81.0814
Predominantly Downwind High464.11.2927
Chicago-Mac Upwind1.0141
Chicago-Mac All Purpose1.0348
Chicago-Mac Downwind1.0614
Bayview-Mac Cove Island0.9724
Bayview-Mac Shore0.9837
Scoring OptionTime On
Distance		Time On
Time
Predominantly Reaching519.41.1553
Predominantly Reaching Low622.70.9635
Predominantly Reaching Medium515.31.1643
Predominantly Reaching High459.81.3048
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low949.90.6317
5-Band Low / Medium801.40.7487
5-Band Medium648.30.9254
5-Band Medium / High588.31.0198
5-Band High563.71.0645
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance590.1
Triple Number Coastal/Long Distance Low681.7
Triple Number Coastal/Long Distance Medium541.2
Triple Number Coastal/Long Distance High489.9
Triple Number Windward/Leeward Low872.5
Triple Number Windward/Leeward Medium658.8
Triple Number Windward/Leeward High580.4
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating (Coastal/Long Distance)590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Custom scoring options for Germany
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8801
Triple Number Coastal/Long Distance Medium1.1087
Triple Number Coastal/Long Distance High1.2248
Triple Number Windward/Leeward Low0.6877
Triple Number Windward/Leeward Medium0.9108
Triple Number Windward/Leeward High1.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low681.7
Triple Number Coastal/Long Distance Medium541.2
Triple Number Coastal/Long Distance High489.9
Triple Number Windward/Leeward Low872.5
Triple Number Windward/Leeward Medium658.8
Triple Number Windward/Leeward High580.4
Predominantly Upwind582.3
Predominantly Downwind555.3
Predominantly Reaching532.2
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8801
Triple Number Coastal/Long Distance Medium1.1087
Triple Number Coastal/Long Distance High1.2248
Triple Number Windward/Leeward Low0.6877
Triple Number Windward/Leeward Medium0.9108
Triple Number Windward/Leeward High1.0337
Coastal/Long Distance1.0168
Predominantly Upwind1.0304
Predominantly Downwind1.0805
Custom scoring options for Norway
Scoring OptionTime On
Time
Tretall Distanseseilas Lite vind0.8801
Tretall Distanseseilas Mellomvind1.1087
Tretall Distanseseilas Mye vind1.2248
Tretall Pølsebane Lite vind0.6877
Tretall Pølsebane Mellomvind0.9108
Tretall Pølsebane Mye vind1.0337
Distanseseilas ett tall (OSN 8-16kn)1.0168
Distanseseilas ett tall (APH 6-20kn)1.1026
Enkeltall Motvind1.0304
Enkeltall Medvind1.0805
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Coastal/Long Distance590.11.0168
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind582.31.0304
Predominantly Downwind555.31.0805
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore566.81.0585
Cape Doctor Coastal479.51.2513
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8801
Triple Number Coastal/Long Distance Medium1.1087
Triple Number Coastal/Long Distance High1.2248
Triple Number Windward/Leeward Low0.6877
Triple Number Windward/Leeward Medium0.9108
Triple Number Windward/Leeward High1.0337
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8801
Triple Number Coastal/Long Distance Medium1.1087
Triple Number Coastal/Long Distance High1.2248
Triple Number Windward/Leeward Low0.6877
Triple Number Windward/Leeward Medium0.9108
Triple Number Windward/Leeward High1.0337
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Predominantly Upwind582.31.0304
Predominantly Downwind555.31.0805
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance590.11.0168
Triple Number Coastal/Long Distance Low681.70.8801
Triple Number Coastal/Long Distance Medium541.21.1087
Triple Number Coastal/Long Distance High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance966.5737.9625.5561.7527.0499.1454.8
Custom scoring options for United States of America
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low681.70.8801
Triple Number All Purpose Medium541.21.1087
Triple Number All Purpose High489.91.2248
Triple Number Windward/Leeward Low872.50.6877
Triple Number Windward/Leeward Medium658.80.9108
Triple Number Windward/Leeward High580.41.0337
Predominantly Upwind582.31.0304
Predominantly Downwind555.31.0805
Predominantly Upwind Low740.70.8100
Predominantly Upwind Medium598.61.0024
Predominantly Upwind High569.31.0539
Predominantly Downwind Low759.30.7902
Predominantly Downwind Medium554.81.0814
Predominantly Downwind High464.11.2927
Chicago-Mac Upwind1.0141
Chicago-Mac All Purpose1.0348
Chicago-Mac Downwind1.0614
Bayview-Mac Cove Island0.9724
Bayview-Mac Shore0.9837
Harvest Moon Regatta478.01.2552
Scoring OptionTime On
Distance		Time On
Time
San Francisco Bay Heavy568.81.0549
San Francisco Bay Medium649.60.9236
Predominantly Reaching519.41.1553
Predominantly Reaching Low622.70.9635
Predominantly Reaching Medium515.31.1643
Predominantly Reaching High459.81.3048
Windward/Leeward 60-40 Low870.10.6896
Windward/Leeward 60-40 Medium674.70.8892
Windward/Leeward 60-40 High612.20.9801
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low949.90.6317
5-Band Low / Medium801.40.7487
5-Band Medium648.30.9254
5-Band Medium / High588.31.0198
5-Band High563.71.0645
ORC Ref  04560002Q2CIssued on 11/07/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

THUNDER

USA 18431

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassEXPRESS 37Measurement17/08/2015HINPlan reviewHull constructionCoredCarbon RudderYesLight stanchionsNoTrim tabNo
LOA11.305Max. Beam3.530Draft2.227Displacement4,878Wetted area25.57IMS L9.739LSM09.325Acc. length11.305Sink (kg/mm) 18.27
VCGD0.139VCGM0.131RM Rated (kg·m) 108.5Limit of positive stability(°) N/AStability IndexN/A
PROPELLER
Propeller TypeFolding 2 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.420PBW0.110PIPA0.0029
PSD0.020PHD0.050PHL0.140
PSA14.0°ESL1.010
ST10.020ST20.100ST30.100
ST40.050ST50.180
RIG
Forestay tensionAftInner stayNone FittedCarbon mastNoHeadsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoRunners/Checkstays1Spreaders2Rotating mastNo
P12.800IG14.870ISP14.800MDT10.120MDL10.200MDT20.120MDL20.170TL0.780MW0.120GO0.130
E4.210J4.340BAS1.710FSD0.030SFJ0.000SPL4.390WPLTPS0.000BD0.150MWT132.00MCG4.630
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM entered directlyRM entered108.2Flotation Date17/08/2015MeasurerComment
SFFP0.518FFMFF1.212LCFcl5.999SG1.0000
SAFP10.372FAMFA1.058LCFsh6.248HBI1.118
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  04560002Q2CIssued on 11/07/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

THUNDER

USA 18431

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentMain0.150.911.592.723.5532.1917/10/2021
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentAP #10.080.871.673.335.056.7715.17NoNo 51.1217/10/2021
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment015.4015.4015.408.117.64102.87
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateComment2020 A215.5013.8114.668.297.90105%100.2917/10/2021A0/A315.0514.0014.536.507.7983%81.8016/12/2015OUS140789-001
ORC Ref  04560002Q2CIssued on 11/07/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org