Club Certificate2025
Dubbel DuckNOR 8856
Norges Seilforbund
Sognsveien 73
0854 OSLO
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 Angles42.1°42.1°40.4°38.6°38.3°38.4°38.6°39.7°42.9°
Beat VMG2.563.474.124.454.554.594.614.564.33
52°4.025.245.956.276.396.466.506.536.45
60°4.285.486.116.426.586.666.726.786.76
75°4.435.636.226.566.806.967.057.207.25
90°4.315.546.206.596.897.157.357.647.81
110°4.065.376.226.697.087.427.718.168.42
120°3.865.186.086.597.027.437.858.759.59
135°3.354.645.656.296.737.157.608.7911.20
150°2.773.954.995.826.376.787.188.109.85
Run VMG2.403.424.325.105.756.246.647.398.53
Gybe Angles146.4°146.4°151.4°156.5°165.1°172.7°177.7°177.2°144.2°
APH ToD:605.0CDL: 7.095APH ToT: 0.9917CertNo:676004
BOAT
ClassOne Off 1/2 tonDesignerD.DuckmanBuilderOneOffAge dateSeries date01/1983Offset fileHALFTONNER-NOR8856.offData file676004
HULL
Length Overall9.152 mMaximum Beam3.324 mDraft1.501 mDisplacement2,030 kgDLR7.3750IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeFolding 2 bladesDiameter0.360m
CREW
Maximum weight373 kg(default)Minimum weight243 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail27.4727.95Headsail Luffed21.7821.78Headsail FlyingSymmetric47.7347.73Asymmetric
STORM SAIL AREAS (m²)
Trysail8.45Storm Jib5.63Heavy Weather Jib15.20
SAIL LIMITS
Headsails5Spinnakers4
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.
Club Certificate2025
Dubbel DuckNOR 8856
Norges Seilforbund
Sognsveien 73
0854 OSLO
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 VMG1403.91036.6874.7809.9790.9784.2781.6789.4830.7
52°896.1687.1604.8574.5563.1557.6553.8551.0557.9
60°841.0656.6589.0561.0547.4540.8536.0530.8532.5
75°812.7640.0578.6548.8529.6517.4510.3499.9496.4
90°834.6650.4580.7546.1522.8503.7489.6471.4460.8
110°887.4669.9578.7537.8508.2485.1466.8441.4427.3
120°931.8694.8592.2546.1512.7484.7458.8411.2375.5
135°1074.4775.4637.3572.5535.1503.4473.7409.7321.4
150°1299.5911.5722.1618.2565.0530.9501.3444.3365.5
Run VMG1500.31052.5833.0705.7626.5576.5541.9487.4422.1
Selected Courses
Windward / Leeward1450.91044.6853.8757.8708.7680.4661.8638.4626.4
All purpose1091.1807.7681.1620.9589.2568.8553.4529.7512.2
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward736.00.8153
All purpose605.00.9917
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7158
Downwind "popa"0.8707
70% up, 30% down "Ilhabela"0.7562
30% up, 70% down "Ilhabela-inverso"0.8176
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Predominantly Upwind653.10.9187
Predominantly Downwind611.30.9816
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low744.40.8060
Triple Number AP Medium602.40.9961
Triple Number AP High548.41.0942
Triple Number Windward/Leeward Low989.90.6061
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Single Number Predominant Upwind675.00.8889
Single Number Predominant Reaching598.21.0031
Single Number Predominant Downwind634.30.9459
Predominant Upwind - Low872.90.6874
Predominant Upwind - Low/Med697.20.8606
Predominant Upwind - Medium637.80.9407
Predominant Upwind - Med/High609.00.9852
Predominant Upwind - High596.71.0055
Predominant Downwind Low900.30.6664
Predominant Downwind Low/Med684.10.8771
Predominant Downwind Medium593.71.0105
Predominant Downwind Med/High533.01.1258
Predominant Downwind High488.61.2281
Predominant Reaching Low791.60.7580
Predominant Reaching Low/Med630.50.9516
Predominant Reaching Medium568.01.0564
Predominant Reaching Med/High525.61.1417
Predominant Reaching High495.11.2118
SA/DSPL Upwind30.66SA/DSPL Downwind46.80
Scoring OptionTODTOT
5-Band Windward/Leeward Low1098.80.5461
5-Band Windward/Leeward Low/Med826.60.7258
5-Band Windward/Leeward Medium720.20.8330
5-Band Windward/Leeward Med/High664.90.9024
5-Band Windward/Leeward High640.40.9369
Windward/Leeward 60-40 Low1096.60.5471
Windward/Leeward 60-40 Low/Med834.00.7195
Windward/Leeward 60-40 Medium736.00.8152
Windward/Leeward 60-40 Med/High688.80.8711
Windward/Leeward 60-40 High671.30.8937
5-Band AP Low815.60.7357
5-Band AP Low/Med664.90.9023
5-Band AP Medium595.71.0072
5-Band AP Med/High555.01.0811
5-Band AP High530.81.1304
5-Band SF Bay Tour - Low950.50.6313
5-Band SF Bay Tour - Low/Med792.50.7571
5-Band SF Bay Tour - Medium699.30.8580
5-Band SF Bay Tour - Med/High650.80.9219
5-Band SF Bay Tour - High626.80.9573
Chicago-Mac Upwind0.8678
Chicago-Mac All Purpose0.8935
Chicago-Mac Downwind0.9137
Bayview-Mac Cove Island0.6756
Bayview-Mac Shore0.6813
Harvest Moon Regatta526.61.1395
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance655.0
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating648.70.9250
FinRating, kevyt tuuli1078.70.9270
FinRating, kova tuuli531.90.9401
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.9160
Triple Number Coastal/Long Distance Low0.8060
Triple Number Coastal/Long Distance Medium0.9961
Triple Number Coastal/Long Distance High1.0942
Triple Number Windward/Leeward Low0.6321
Triple Number Windward/Leeward Medium0.8218
Triple Number Windward/Leeward High0.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
For information
General Purpose Handicap (GPH)671.5
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low744.4
Triple Number Coastal/Long Distance Medium602.3
Triple Number Coastal/Long Distance High548.3
Triple Number Windward/Leeward Low949.2
Triple Number Windward/Leeward Medium730.1
Triple Number Windward/Leeward High657.7
Predominantly Upwind653.1
Predominantly Downwind611.3
Predominantly Reaching588.6
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8060
Triple Number Coastal/Long Distance Medium0.9961
Triple Number Coastal/Long Distance High1.0942
Triple Number Windward/Leeward Low0.6321
Triple Number Windward/Leeward Medium0.8218
Triple Number Windward/Leeward High0.9123
Coastal/Long Distance0.9160
Predominantly Upwind0.9187
Predominantly Downwind0.9816
For information
General Purpose Handicap (GPH)671.5
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.9917
Distanseseilas Trippeltall svak vind0.8060
Distanseseilas Trippeltall mellomvind0.9961
Distanseseilas Trippeltall sterk vind1.0942
Pølsebane Trippeltall svak vind0.6321
Pølsebane Trippeltall mellomvind0.8218
Pølsebane Trippeltall sterk vind0.9123
Motvind Singeltall0.9187
Medvind Singeltall0.9816
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Coastal/Long Distance655.00.9160
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind653.10.9187
Predominantly Downwind611.30.9816
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore630.00.9524
Cape Doctor Coastal517.51.1595
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8060
Triple Number Coastal/Long Distance Medium0.9961
Triple Number Coastal/Long Distance High1.0942
Triple Number Windward/Leeward Low0.6321
Triple Number Windward/Leeward Medium0.8218
Triple Number Windward/Leeward High0.9123
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8060
Triple Number Coastal/Long Distance Medium0.9961
Triple Number Coastal/Long Distance High1.0942
Triple Number Windward/Leeward Low0.6321
Triple Number Windward/Leeward Medium0.8218
Triple Number Windward/Leeward High0.9123
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Predominantly Upwind653.10.9187
Predominantly Downwind611.30.9816
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance655.00.9160
Triple Number Coastal/Long Distance Low744.40.8060
Triple Number Coastal/Long Distance Medium602.30.9961
Triple Number Coastal/Long Distance High548.31.0942
Triple Number Windward/Leeward Low949.20.6321
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1540.41045.4807.3691.0627.3590.2558.1501.9481.0
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low744.40.8060
Triple Number AP Medium602.40.9961
Triple Number AP High548.41.0942
Triple Number Windward/Leeward Low989.90.6061
Triple Number Windward/Leeward Medium730.10.8218
Triple Number Windward/Leeward High657.70.9123
Single Number Predominant Upwind675.00.8889
Single Number Predominant Reaching598.21.0031
Single Number Predominant Downwind634.30.9459
Predominant Upwind - Low872.90.6874
Predominant Upwind - Low/Med697.20.8606
Predominant Upwind - Medium637.80.9407
Predominant Upwind - Med/High609.00.9852
Predominant Upwind - High596.71.0055
Predominant Downwind Low900.30.6664
Predominant Downwind Low/Med684.10.8771
Predominant Downwind Medium593.71.0105
Predominant Downwind Med/High533.01.1258
Predominant Downwind High488.61.2281
Predominant Reaching Low791.60.7580
Predominant Reaching Low/Med630.50.9516
Predominant Reaching Medium568.01.0564
Predominant Reaching Med/High525.61.1417
Predominant Reaching High495.11.2118
SA/DSPL Upwind30.66SA/DSPL Downwind46.80
Scoring OptionTODTOT
5-Band Windward/Leeward Low1098.80.5461
5-Band Windward/Leeward Low/Med826.60.7258
5-Band Windward/Leeward Medium720.20.8330
5-Band Windward/Leeward Med/High664.90.9024
5-Band Windward/Leeward High640.40.9369
Windward/Leeward 60-40 Low1096.60.5471
Windward/Leeward 60-40 Low/Med834.00.7195
Windward/Leeward 60-40 Medium736.00.8152
Windward/Leeward 60-40 Med/High688.80.8711
Windward/Leeward 60-40 High671.30.8937
5-Band AP Low815.60.7357
5-Band AP Low/Med664.90.9023
5-Band AP Medium595.71.0072
5-Band AP Med/High555.01.0811
5-Band AP High530.81.1304
5-Band SF Bay Tour - Low950.50.6313
5-Band SF Bay Tour - Low/Med792.50.7571
5-Band SF Bay Tour - Medium699.30.8580
5-Band SF Bay Tour - Med/High650.80.9219
5-Band SF Bay Tour - High626.80.9573
Chicago-Mac Upwind0.8678
Chicago-Mac All Purpose0.8935
Chicago-Mac Downwind0.9137
Bayview-Mac Cove Island0.6756
Bayview-Mac Shore0.6813
Harvest Moon Regatta526.61.1395
Club Certificate2025
Dubbel DuckNOR 8856
Norges Seilforbund
Sognsveien 73
0854 OSLO
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassOne Off 1/2 tonMeasurementHINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA9.152Max. Beam3.324Draft1.501Displacement2,030Wetted area13.84IMS L7.061LSM06.504Acc. length9.152Sink (kg/mm) 10.40
VCGD-0.032VCGM0.062RM Rated (kg·m) 47.3Limit of positive stability(°) N/AStability IndexN/ADefault crew weight373Declared crew weightN/A
PROPELLER
Propeller TypeFolding 2 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.360PBWPIPA0.0012
PSD0.000PHD0.000PHL0.000
PSA0.0°ESL0.000
ST10.000ST20.000ST30.000
ST40.000ST50.000
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays2CheckstaysSpreaders2Rotating mastNo
P11.300IG10.610ISP10.690MDT10.090MDL10.110MDT20.000MDL20.000TLTaperMW0.000GO0.000
E4.270J3.120BAS1.310FSDFoilSFJ0.120SPL3.240WPLTPS0.000BD0.000MWT0.00MCG0.000
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered-0.032Flotation Date01/01/2015
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Club Certificate2025
Dubbel DuckNOR 8856
Norges Seilforbund
Sognsveien 73
0854 OSLO
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment460-2021091501190.230.851.492.563.4327.4714/09/2021
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment460-2021091511240.030.501.082.053.214.4710.13NoNo 21.7815/09/2021460-2021091511250.030.501.082.053.214.4710.13NoNo 21.7815/09/2021460-2021091501210.700.360.661.402.163.980.00NoNo 18.1314/09/2021
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment460-20210915012210.1410.1410.145.685.5247.7314/09/2021