One DesignInternational Certificate2025
J 24 ONE DESIGNMNA-1234
Rated boat velocities in knots
Wind Velocity 4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Beat Angles43.4°43.4°41.5°39.7°38.4°38.2°38.2°39.5°42.6°
Beat VMG2.263.073.674.084.334.404.424.374.16
52°3.514.675.435.826.046.146.186.216.14
60°3.744.915.615.966.176.316.376.456.43
75°3.895.055.706.066.326.546.696.866.94
90°3.804.965.686.136.446.636.877.247.49
110°3.614.855.716.196.586.947.307.918.53
120°3.444.695.586.096.496.897.318.5810.02
135°3.044.205.135.836.256.637.038.1811.16
150°2.473.574.555.365.936.306.667.479.34
Run VMG2.133.093.954.685.345.816.176.838.09
Gybe Angles148.0°148.0°152.3°157.7°164.6°174.5°177.2°177.2°139.7°
APH ToD:650.5CDL: 6.491APH ToT: 0.9224CertNo:J24
BOAT
ClassJ-24DesignerJOHNSTONEBuilderJ-BOATSAge dateSeries date01/1977Offset fileJ24.OD.offData filej24
HULL
Length Overall7.318 mMaximum Beam2.692 mDraft1.225 mDisplacement1,269 kgDLR5.6329IMS DivisionSportboatDynamic Allowance0.000%Age Allowance0.487%
PROPELLER
InstallationNo PropellerTypeN/ADiameterN/A
CREW
Maximum weight400 kg(declared)Minimum weight270 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension-0.20 m
SAIL AREAS (m²)
MeasuredRatedMainsail15.6616.03Headsail Luffed18.7818.78Headsail FlyingSymmetric35.3435.34Asymmetric
STORM SAIL AREAS (m²)
Trysail4.44Storm Jib3.37Heavy Weather Jib9.08
SAIL LIMITS
Headsails5Spinnakers4
STABILITY
Righting Moment27.0 kg·mStability Index93.1
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.
One DesignInternational Certificate2025
J 24 ONE DESIGNMNA-1234
Time Allowances in secs/NM
Wind Velocity 4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Beat VMG1595.21172.7979.9881.3831.3817.8814.0824.7865.8
52°1025.6771.3663.5618.1596.1586.6582.4579.6586.7
60°961.9733.6641.4604.4583.2570.5564.8557.8560.0
75°924.4713.5631.1593.8569.2550.5538.2525.1518.8
90°947.3725.5634.3586.8559.2542.6523.7497.1480.7
110°998.3741.9630.5582.0547.0518.4493.2454.9422.0
120°1045.1768.2645.0590.8554.5522.7492.5419.6359.1
135°1185.4857.9702.1617.2576.3542.8512.3440.3322.5
150°1456.11009.8791.4671.8607.3571.2540.2482.2385.3
Run VMG1686.41166.0911.8768.9674.2619.2583.6527.0444.9
Selected Courses
Windward / Leeward1638.21169.4945.8825.1752.8718.5698.8675.9655.4
All purpose1232.3901.9750.3672.7628.4604.0586.1558.3531.4
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward791.30.7583
All purpose650.50.9224
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.6644
Downwind "popa"0.7999
70% up, 30% down "Ilhabela"0.6999
30% up, 70% down "Ilhabela-inverso"0.7538
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Predominantly Upwind701.70.8550
Predominantly Downwind661.30.9073
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low826.10.7263
Triple Number AP Medium647.30.9270
Triple Number AP High580.11.0343
Triple Number Windward/Leeward Low1103.80.5436
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Single Number Predominant Upwind728.00.8242
Single Number Predominant Reaching646.90.9275
Single Number Predominant Downwind687.60.8725
Predominant Upwind - Low979.70.6124
Predominant Upwind - Low/Med763.20.7862
Predominant Upwind - Medium680.60.8816
Predominant Upwind - Med/High642.20.9342
Predominant Upwind - High627.50.9562
Predominant Downwind Low1001.70.5990
Predominant Downwind Low/Med747.40.8028
Predominant Downwind Medium638.70.9394
Predominant Downwind Med/High570.11.0524
Predominant Downwind High519.41.1552
Predominant Reaching Low882.80.6797
Predominant Reaching Low/Med687.80.8723
Predominant Reaching Medium609.40.9846
Predominant Reaching Med/High560.21.0711
Predominant Reaching High523.51.1461
SA/DSPL Upwind29.36SA/DSPL Downwind43.47
Scoring OptionTODTOT
5-Band Windward/Leeward Low1231.30.4873
5-Band Windward/Leeward Low/Med907.70.6610
5-Band Windward/Leeward Medium770.80.7784
5-Band Windward/Leeward Med/High702.80.8538
5-Band Windward/Leeward High676.30.8872
Windward/Leeward 60-40 Low1231.10.4874
Windward/Leeward 60-40 Low/Med916.50.6547
Windward/Leeward 60-40 Medium786.30.7630
Windward/Leeward 60-40 Med/High725.80.8267
Windward/Leeward 60-40 High707.00.8486
5-Band AP Low909.50.6597
5-Band AP Low/Med727.30.8250
5-Band AP Medium638.30.9400
5-Band AP Med/High587.91.0205
5-Band AP High558.41.0744
5-Band SF Bay Tour - Low1062.40.5647
5-Band SF Bay Tour - Low/Med870.10.6896
5-Band SF Bay Tour - Medium748.00.8021
5-Band SF Bay Tour - Med/High687.40.8728
5-Band SF Bay Tour - High660.50.9084
Chicago-Mac Upwind0.8009
Chicago-Mac All Purpose0.8234
Chicago-Mac Downwind0.8406
Bayview-Mac Cove Island0.6094
Bayview-Mac Shore0.6145
Harvest Moon Regatta565.61.0608
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance705.2
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating (Coastal/Long Distance)705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.8508
Triple Number Coastal/Long Distance Low0.7263
Triple Number Coastal/Long Distance Medium0.9271
Triple Number Coastal/Long Distance High1.0343
Triple Number Windward/Leeward Low0.5673
Triple Number Windward/Leeward Medium0.7649
Triple Number Windward/Leeward High0.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
For information
General Purpose Handicap (GPH)727.9
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low826.1
Triple Number Coastal/Long Distance Medium647.2
Triple Number Coastal/Long Distance High580.1
Triple Number Windward/Leeward Low1057.6
Triple Number Windward/Leeward Medium784.4
Triple Number Windward/Leeward High695.1
Predominantly Upwind701.7
Predominantly Downwind661.3
Predominantly Reaching636.0
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7263
Triple Number Coastal/Long Distance Medium0.9271
Triple Number Coastal/Long Distance High1.0343
Triple Number Windward/Leeward Low0.5673
Triple Number Windward/Leeward Medium0.7649
Triple Number Windward/Leeward High0.8632
Coastal/Long Distance0.8508
Predominantly Upwind0.8550
Predominantly Downwind0.9073
For information
General Purpose Handicap (GPH)727.9
Custom scoring options for Norway
Scoring OptionTime On
Time
Tretall Distanseseilas Lite vind0.7263
Tretall Distanseseilas Mellomvind0.9271
Tretall Distanseseilas Mye vind1.0343
Tretall Pølsebane Lite vind0.5673
Tretall Pølsebane Mellomvind0.7649
Tretall Pølsebane Mye vind0.8632
Distanseseilas ett tall0.9224
Enkeltall Motvind0.8550
Enkeltall Medvind0.9073
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Coastal/Long Distance705.20.8508
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind701.70.8550
Predominantly Downwind661.30.9073
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore661.50.9070
Cape Doctor Coastal539.51.1122
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7263
Triple Number Coastal/Long Distance Medium0.9271
Triple Number Coastal/Long Distance High1.0343
Triple Number Windward/Leeward Low0.5673
Triple Number Windward/Leeward Medium0.7649
Triple Number Windward/Leeward High0.8632
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7263
Triple Number Coastal/Long Distance Medium0.9271
Triple Number Coastal/Long Distance High1.0343
Triple Number Windward/Leeward Low0.5673
Triple Number Windward/Leeward Medium0.7649
Triple Number Windward/Leeward High0.8632
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Predominantly Upwind701.70.8550
Predominantly Downwind661.30.9073
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance705.20.8508
Triple Number Coastal/Long Distance Low826.10.7263
Triple Number Coastal/Long Distance Medium647.20.9271
Triple Number Coastal/Long Distance High580.11.0343
Triple Number Windward/Leeward Low1057.60.5673
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1740.61169.0892.3750.6668.2626.7592.2527.2495.5
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low826.10.7263
Triple Number AP Medium647.30.9270
Triple Number AP High580.11.0343
Triple Number Windward/Leeward Low1103.80.5436
Triple Number Windward/Leeward Medium784.40.7649
Triple Number Windward/Leeward High695.10.8632
Single Number Predominant Upwind728.00.8242
Single Number Predominant Reaching646.90.9275
Single Number Predominant Downwind687.60.8725
Predominant Upwind - Low979.70.6124
Predominant Upwind - Low/Med763.20.7862
Predominant Upwind - Medium680.60.8816
Predominant Upwind - Med/High642.20.9342
Predominant Upwind - High627.50.9562
Predominant Downwind Low1001.70.5990
Predominant Downwind Low/Med747.40.8028
Predominant Downwind Medium638.70.9394
Predominant Downwind Med/High570.11.0524
Predominant Downwind High519.41.1552
Predominant Reaching Low882.80.6797
Predominant Reaching Low/Med687.80.8723
Predominant Reaching Medium609.40.9846
Predominant Reaching Med/High560.21.0711
Predominant Reaching High523.51.1461
SA/DSPL Upwind29.36SA/DSPL Downwind43.47
Scoring OptionTODTOT
5-Band Windward/Leeward Low1231.30.4873
5-Band Windward/Leeward Low/Med907.70.6610
5-Band Windward/Leeward Medium770.80.7784
5-Band Windward/Leeward Med/High702.80.8538
5-Band Windward/Leeward High676.30.8872
Windward/Leeward 60-40 Low1231.10.4874
Windward/Leeward 60-40 Low/Med916.50.6547
Windward/Leeward 60-40 Medium786.30.7630
Windward/Leeward 60-40 Med/High725.80.8267
Windward/Leeward 60-40 High707.00.8486
5-Band AP Low909.50.6597
5-Band AP Low/Med727.30.8250
5-Band AP Medium638.30.9400
5-Band AP Med/High587.91.0205
5-Band AP High558.41.0744
5-Band SF Bay Tour - Low1062.40.5647
5-Band SF Bay Tour - Low/Med870.10.6896
5-Band SF Bay Tour - Medium748.00.8021
5-Band SF Bay Tour - Med/High687.40.8728
5-Band SF Bay Tour - High660.50.9084
Chicago-Mac Upwind0.8009
Chicago-Mac All Purpose0.8234
Chicago-Mac Downwind0.8406
Bayview-Mac Cove Island0.6094
Bayview-Mac Shore0.6145
Harvest Moon Regatta565.61.0608
One DesignInternational Certificate2025
J 24 ONE DESIGNMNA-1234
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassJ-24Measurement16/04/2015HINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA7.318Max. Beam2.692Draft1.225Displacement1,269Wetted area10.37IMS L6.529LSM06.085Acc. length7.318Sink (kg/mm) 8.53
VCGD0.049VCGM0.076RM Rated (kg·m) 27.0Limit of positive stability(°) 101.2Stability Index93.1Default crew weight339Declared crew weight400
PROPELLER
Propeller TypeNo Propeller
Hydro generatorNo
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0Checkstays0Spreaders1Rotating mastNo
P8.538IG8.125ISP8.210MDT10.087MDL10.124MDT20.087MDL20.124TL0.000MW0.124GO0.150
E2.970J2.900BAS1.080FSDSFJSPL2.975WPLTPSBD0.085MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodPoles incliningFlotation Date16/04/2015
SFFP0.286FFM0.808FF0.808LCFcl4.079SG1.0250
SAFP7.317FAM0.699FA0.699LCFsh4.293HBI0.732
W120.0W220.0W320.0W420.0
PD1332.0PD2330.0PD3331.0PD4332.0
WD5.680PLM9000.00GSA1.0RSA1.0RM27.0
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
One DesignInternational Certificate2025
J 24 ONE DESIGNMNA-1234
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentORC0.150.701.181.982.6015.66Class rules
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentORC0.104.358.46NoNo 18.78Class rules
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateCommentORC8.138.138.135.225.2035.34Class rules