One DesignInternational Certificate2025
X-79 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 Angles42.7°42.7°40.5°38.2°37.4°37.2°37.4°38.2°40.8°
Beat VMG2.443.323.974.384.514.564.584.554.39
52°3.795.005.766.106.246.306.356.396.35
60°4.035.235.916.236.406.486.546.626.62
75°4.175.366.006.346.596.766.877.037.10
90°4.005.266.036.406.656.927.157.477.71
110°3.975.256.086.556.937.257.528.058.67
120°3.795.085.966.466.907.337.848.9610.15
135°3.304.555.526.196.637.067.559.5212.36
150°2.653.814.855.706.276.687.088.1311.07
Run VMG2.293.304.214.985.656.126.507.259.59
Gybe Angles146.7°146.7°151.4°157.3°164.7°172.7°176.3°170.3°143.1°
APH ToD:617.7CDL: 6.823APH ToT: 0.9713CertNo:X79
BOAT
ClassX-79 ODDesignerJEPPESENBuilderX-YACHTSAge dateSeries date01/1979Offset filex79.OD.OFFData filex79
HULL
Length Overall7.927 mMaximum Beam2.860 mDraft1.358 mDisplacement1,552 kgDLR7.2438IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.487%
PROPELLER
InstallationNo PropellerTypeN/ADiameterN/A
CREW
Maximum weight352 kg(declared)Minimum weight222 kg ✱ when appliedNon Manual PowerNoCrew Arm ExtensionLoose or no lifelines
SAIL AREAS (m²)
MeasuredRatedMainsail20.8821.30Headsail Luffed18.8318.83Headsail FlyingSymmetric48.8248.82Asymmetric
STORM SAIL AREAS (m²)
Trysail6.13Storm Jib4.25Heavy Weather Jib11.46
SAIL LIMITS
Headsails5Spinnakers4
STABILITY
Righting Moment31.7 kg·mStability Index95.3
COMMENTS
ONE-DESIGN CERTIFICATE
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
X-79 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 VMG1478.11085.4906.2821.6797.7789.2785.9790.5820.4
52°950.8720.3625.5589.8576.9571.1567.2563.4566.9
60°892.4688.2609.2577.9562.5555.6550.4544.0544.1
75°863.1672.0600.2567.4546.3532.4524.3512.2507.1
90°900.0684.8597.3562.6541.5520.4503.7481.6467.1
110°907.6685.1591.8550.0519.8496.5478.6446.9415.2
120°950.6708.7604.2557.3522.0490.8459.1401.8354.6
135°1089.3790.8651.9581.4542.9509.6476.7378.3291.3
150°1357.6943.9741.6631.5574.2539.2508.4442.7325.2
Run VMG1570.91089.9855.2723.4637.2588.2554.0496.7375.5
Selected Courses
Windward / Leeward1522.31087.7880.7772.5717.4688.7670.0643.6598.0
All purpose1143.1839.6701.7634.6600.3578.8562.1531.8498.8
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward749.10.8010
All purpose617.70.9713
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7028
Downwind "popa"0.8494
70% up, 30% down "Ilhabela"0.7411
30% up, 70% down "Ilhabela-inverso"0.7994
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Predominantly Upwind667.70.8986
Predominantly Downwind624.50.9608
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low770.60.7786
Triple Number AP Medium614.80.9759
Triple Number AP High554.91.0812
Triple Number Windward/Leeward Low1027.40.5840
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Single Number Predominant Upwind690.90.8685
Single Number Predominant Reaching612.80.9791
Single Number Predominant Downwind647.40.9268
Predominant Upwind - Low911.80.6580
Predominant Upwind - Low/Med717.20.8365
Predominant Upwind - Medium650.20.9228
Predominant Upwind - Med/High617.70.9714
Predominant Upwind - High599.51.0009
Predominant Downwind Low932.50.6434
Predominant Downwind Low/Med701.80.8549
Predominant Downwind Medium605.60.9908
Predominant Downwind Med/High539.91.1113
Predominant Downwind High482.81.2427
Predominant Reaching Low823.90.7282
Predominant Reaching Low/Med648.30.9256
Predominant Reaching Medium581.21.0324
Predominant Reaching Med/High534.11.1235
Predominant Reaching High494.11.2144
SA/DSPL Upwind29.59SA/DSPL Downwind51.93
Scoring OptionTODTOT
5-Band Windward/Leeward Low1145.10.5240
5-Band Windward/Leeward Low/Med848.90.7068
5-Band Windward/Leeward Medium731.40.8203
5-Band Windward/Leeward Med/High672.70.8920
5-Band Windward/Leeward High640.30.9371
Windward/Leeward 60-40 Low1143.90.5245
Windward/Leeward 60-40 Low/Med856.50.7005
Windward/Leeward 60-40 Medium746.80.8035
Windward/Leeward 60-40 Med/High695.80.8623
Windward/Leeward 60-40 High671.20.8940
5-Band AP Low847.10.7083
5-Band AP Low/Med683.30.8780
5-Band AP Medium607.60.9875
5-Band AP Med/High563.01.0657
5-Band AP High531.31.1292
5-Band SF Bay Tour - Low987.10.6078
5-Band SF Bay Tour - Low/Med813.40.7377
5-Band SF Bay Tour - Medium709.70.8455
5-Band SF Bay Tour - Med/High656.70.9136
5-Band SF Bay Tour - High624.00.9616
Chicago-Mac Upwind0.8468
Chicago-Mac All Purpose0.8722
Chicago-Mac Downwind0.8932
Bayview-Mac Cove Island0.6519
Bayview-Mac Shore0.6571
Harvest Moon Regatta537.41.1166
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance668.5
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating (Coastal/Long Distance)668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.8975
Triple Number Coastal/Long Distance Low0.7786
Triple Number Coastal/Long Distance Medium0.9759
Triple Number Coastal/Long Distance High1.0812
Triple Number Windward/Leeward Low0.6096
Triple Number Windward/Leeward Medium0.8084
Triple Number Windward/Leeward High0.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
For information
General Purpose Handicap (GPH)688.1
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low770.6
Triple Number Coastal/Long Distance Medium614.8
Triple Number Coastal/Long Distance High554.9
Triple Number Windward/Leeward Low984.3
Triple Number Windward/Leeward Medium742.2
Triple Number Windward/Leeward High664.7
Predominantly Upwind667.7
Predominantly Downwind624.5
Predominantly Reaching602.4
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7786
Triple Number Coastal/Long Distance Medium0.9759
Triple Number Coastal/Long Distance High1.0812
Triple Number Windward/Leeward Low0.6096
Triple Number Windward/Leeward Medium0.8084
Triple Number Windward/Leeward High0.9026
Coastal/Long Distance0.8975
Predominantly Upwind0.8986
Predominantly Downwind0.9608
For information
General Purpose Handicap (GPH)688.1
Custom scoring options for Norway
Scoring OptionTime On
Time
Tretall Distanseseilas Lite vind0.7786
Tretall Distanseseilas Mellomvind0.9759
Tretall Distanseseilas Mye vind1.0812
Tretall Pølsebane Lite vind0.6096
Tretall Pølsebane Mellomvind0.8084
Tretall Pølsebane Mye vind0.9026
Distanseseilas ett tall0.9713
Enkeltall Motvind0.8986
Enkeltall Medvind0.9608
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Coastal/Long Distance668.50.8975
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind667.70.8986
Predominantly Downwind624.50.9608
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore611.60.9810
Cape Doctor Coastal508.71.1795
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7786
Triple Number Coastal/Long Distance Medium0.9759
Triple Number Coastal/Long Distance High1.0812
Triple Number Windward/Leeward Low0.6096
Triple Number Windward/Leeward Medium0.8084
Triple Number Windward/Leeward High0.9026
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7786
Triple Number Coastal/Long Distance Medium0.9759
Triple Number Coastal/Long Distance High1.0812
Triple Number Windward/Leeward Low0.6096
Triple Number Windward/Leeward Medium0.8084
Triple Number Windward/Leeward High0.9026
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Predominantly Upwind667.70.8986
Predominantly Downwind624.50.9608
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance668.50.8975
Triple Number Coastal/Long Distance Low770.60.7786
Triple Number Coastal/Long Distance Medium614.80.9759
Triple Number Coastal/Long Distance High554.91.0812
Triple Number Windward/Leeward Low984.30.6096
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1617.21087.9832.2705.4637.8599.9566.3505.8470.2
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low770.60.7786
Triple Number AP Medium614.80.9759
Triple Number AP High554.91.0812
Triple Number Windward/Leeward Low1027.40.5840
Triple Number Windward/Leeward Medium742.20.8084
Triple Number Windward/Leeward High664.70.9026
Single Number Predominant Upwind690.90.8685
Single Number Predominant Reaching612.80.9791
Single Number Predominant Downwind647.40.9268
Predominant Upwind - Low911.80.6580
Predominant Upwind - Low/Med717.20.8365
Predominant Upwind - Medium650.20.9228
Predominant Upwind - Med/High617.70.9714
Predominant Upwind - High599.51.0009
Predominant Downwind Low932.50.6434
Predominant Downwind Low/Med701.80.8549
Predominant Downwind Medium605.60.9908
Predominant Downwind Med/High539.91.1113
Predominant Downwind High482.81.2427
Predominant Reaching Low823.90.7282
Predominant Reaching Low/Med648.30.9256
Predominant Reaching Medium581.21.0324
Predominant Reaching Med/High534.11.1235
Predominant Reaching High494.11.2144
SA/DSPL Upwind29.59SA/DSPL Downwind51.93
Scoring OptionTODTOT
5-Band Windward/Leeward Low1145.10.5240
5-Band Windward/Leeward Low/Med848.90.7068
5-Band Windward/Leeward Medium731.40.8203
5-Band Windward/Leeward Med/High672.70.8920
5-Band Windward/Leeward High640.30.9371
Windward/Leeward 60-40 Low1143.90.5245
Windward/Leeward 60-40 Low/Med856.50.7005
Windward/Leeward 60-40 Medium746.80.8035
Windward/Leeward 60-40 Med/High695.80.8623
Windward/Leeward 60-40 High671.20.8940
5-Band AP Low847.10.7083
5-Band AP Low/Med683.30.8780
5-Band AP Medium607.60.9875
5-Band AP Med/High563.01.0657
5-Band AP High531.31.1292
5-Band SF Bay Tour - Low987.10.6078
5-Band SF Bay Tour - Low/Med813.40.7377
5-Band SF Bay Tour - Medium709.70.8455
5-Band SF Bay Tour - Med/High656.70.9136
5-Band SF Bay Tour - High624.00.9616
Chicago-Mac Upwind0.8468
Chicago-Mac All Purpose0.8722
Chicago-Mac Downwind0.8932
Bayview-Mac Cove Island0.6519
Bayview-Mac Shore0.6571
Harvest Moon Regatta537.41.1166
One DesignInternational Certificate2025
X-79 ONE DESIGNMNA-1234
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassX-79 ODMeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA7.927Max. Beam2.860Draft1.358Displacement1,552Wetted area12.28IMS L6.638LSM05.983Acc. length7.927Sink (kg/mm) 9.24
VCGD0.056VCGM0.152RM Rated (kg·m) 31.7Limit of positive stability(°) 103.1Stability Index95.3Default crew weight331Declared crew weight352
PROPELLER
Propeller TypeNo Propeller
Hydro generatorNo
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays2Checkstays0Spreaders1Rotating mastNo
P10.000IG9.210ISP9.450MDT10.080MDL10.120MDT20.052MDL20.065TL1.900MW0.120GO0.120
E3.500J2.750BAS1.190FSD0.000SFJ0.000SPL2.830WPLTPSBD0.115MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodPoles incliningFlotation Date01/03/2013
SFFP0.509FFM0.850FF0.853LCFcl4.255SG1.0110
SAFP7.625FAM0.800FA0.802LCFsh4.481HBI0.823
W129.0W229.0W329.0W429.0
PD1602.4PD2601.8PD3602.0PD4601.1
WD8.360PLM9000.00GSA1.0RSA1.0RM31.7
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
One DesignInternational Certificate2025
X-79 ONE DESIGNMNA-1234
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentORC0.140.741.302.242.9820.88* Copied from legacy *
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentORC0.054.149.00NoNo 18.83* Copied from legacy *
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateCommentORC9.259.259.256.684.9548.82* Copied from legacy *