Club Certificate2025
VellamoNOR 5477
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 Angles44.0°44.0°42.1°40.5°39.1°38.6°38.2°38.4°39.8°
Beat VMG2.183.003.654.124.414.564.634.674.61
52°3.414.615.475.996.276.426.496.566.57
60°3.634.875.716.176.426.586.676.766.78
75°3.775.035.876.316.576.766.907.077.15
90°3.725.055.996.476.746.917.017.317.50
110°3.725.076.046.546.877.157.407.798.07
120°3.544.875.876.456.807.127.428.048.60
135°3.104.325.346.146.586.927.247.928.87
150°2.523.654.685.586.246.626.947.558.31
Run VMG2.183.164.064.855.576.106.497.087.65
Gybe Angles147.1°147.1°151.9°153.7°162.4°169.6°177.7°178.3°177.7°
APH ToD:629.7CDL: 7.267APH ToT: 0.9529CertNo:4790
BOAT
ClassMAMBA 311DesignerBengtKarlssonBuilderBK Marin AbAge date01/1983Series date01/1983Offset fileScale_Mamba31.offData file4790
HULL
Length Overall9.350 mMaximum Beam3.082 mDraft1.613 mDisplacement3,502 kgDLR7.9165IMS DivisionCruiser/RacerDynamic Allowance0.300%Age Allowance0.487%
PROPELLER
InstallationStrutTypeFolding 2 bladesDiameter0.380m
CREW
Maximum weight467 kg(default)Minimum weight337 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail25.0425.41Headsail Luffed21.6921.69Headsail FlyingSymmetric55.2955.29Asymmetric
STORM SAIL AREAS (m²)
Trysail7.43Storm Jib5.16Heavy Weather Jib13.91
SAIL LIMITS
Headsails5
✱ One set on the forestay
Spinnakers4
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
VellamoNOR 5477
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 VMG1655.01198.8985.2874.0815.4789.6777.1771.1781.3
52°1056.0780.6657.6600.8574.2560.8554.4548.5548.3
60°990.5739.0630.1583.4560.4547.3539.7532.7530.7
75°955.2715.5613.1570.5548.1532.6521.6509.1503.2
90°966.7712.7601.0556.1534.0521.1513.3492.6480.2
110°968.8710.6596.5550.8524.3503.4486.4462.4446.2
120°1016.4739.2613.5558.5529.1505.6485.1448.0418.5
135°1162.4833.3674.3585.9546.9520.5497.5454.3405.9
150°1426.9986.2768.8645.5577.2543.5518.9476.8433.1
Run VMG1653.31138.7886.4742.6646.5590.6554.8508.5470.3
Selected Courses
Windward / Leeward1652.51168.7935.8808.3731.0690.1665.9639.8625.8
All purpose1242.7895.7733.2651.0605.6580.7564.4542.0526.4
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward769.60.7797
All purpose629.70.9529
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.6762
Downwind "popa"0.8287
70% up, 30% down "Ilhabela"0.7157
30% up, 70% down "Ilhabela-inverso"0.7762
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Predominantly Upwind682.10.8796
Predominantly Downwind637.60.9411
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low814.40.7367
Triple Number AP Medium625.20.9597
Triple Number AP High560.11.0713
Triple Number Windward/Leeward Low1099.70.5456
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Single Number Predominant Upwind710.60.8444
Single Number Predominant Reaching628.00.9555
Single Number Predominant Downwind667.00.8995
Predominant Upwind - Low986.30.6083
Predominant Upwind - Low/Med750.50.7995
Predominant Upwind - Medium659.20.9102
Predominant Upwind - Med/High615.70.9745
Predominant Upwind - High599.31.0012
Predominant Downwind Low986.20.6084
Predominant Downwind Low/Med723.90.8288
Predominant Downwind Medium613.20.9784
Predominant Downwind Med/High549.41.0920
Predominant Downwind High513.81.1678
Predominant Reaching Low874.00.6865
Predominant Reaching Low/Med665.20.9020
Predominant Reaching Medium584.91.0258
Predominant Reaching Med/High541.91.1073
Predominant Reaching High516.31.1621
SA/DSPL Upwind20.18SA/DSPL Downwind34.69
Scoring OptionTODTOT
5-Band Windward/Leeward Low1231.90.4871
5-Band Windward/Leeward Low/Med894.90.6705
5-Band Windward/Leeward Medium748.70.8014
5-Band Windward/Leeward Med/High671.10.8941
5-Band Windward/Leeward High641.90.9347
Windward/Leeward 60-40 Low1237.40.4849
Windward/Leeward 60-40 Low/Med906.40.6620
Windward/Leeward 60-40 Medium765.30.7840
Windward/Leeward 60-40 Med/High693.10.8656
Windward/Leeward 60-40 High668.30.8978
5-Band AP Low899.80.6668
5-Band AP Low/Med709.30.8459
5-Band AP Medium616.20.9737
5-Band AP Med/High566.81.0585
5-Band AP High543.21.1046
5-Band SF Bay Tour - Low1060.20.5659
5-Band SF Bay Tour - Low/Med857.10.7000
5-Band SF Bay Tour - Medium726.10.8263
5-Band SF Bay Tour - Med/High658.30.9114
5-Band SF Bay Tour - High631.30.9504
Chicago-Mac Upwind0.8179
Chicago-Mac All Purpose0.8452
Chicago-Mac Downwind0.8669
Bayview-Mac Cove Island0.6143
Bayview-Mac Shore0.6190
Harvest Moon Regatta548.91.0930
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance685.0
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating678.10.8848
FinRating, kevyt tuuli1208.90.8272
FinRating, kova tuuli546.40.9150
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.8759
Triple Number Coastal/Long Distance Low0.7367
Triple Number Coastal/Long Distance Medium0.9598
Triple Number Coastal/Long Distance High1.0713
Triple Number Windward/Leeward Low0.5702
Triple Number Windward/Leeward Medium0.7858
Triple Number Windward/Leeward High0.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
For information
General Purpose Handicap (GPH)707.9
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low814.4
Triple Number Coastal/Long Distance Medium625.1
Triple Number Coastal/Long Distance High560.1
Triple Number Windward/Leeward Low1052.3
Triple Number Windward/Leeward Medium763.6
Triple Number Windward/Leeward High662.2
Predominantly Upwind682.1
Predominantly Downwind637.6
Predominantly Reaching613.0
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7367
Triple Number Coastal/Long Distance Medium0.9598
Triple Number Coastal/Long Distance High1.0713
Triple Number Windward/Leeward Low0.5702
Triple Number Windward/Leeward Medium0.7858
Triple Number Windward/Leeward High0.9061
Coastal/Long Distance0.8759
Predominantly Upwind0.8796
Predominantly Downwind0.9411
For information
General Purpose Handicap (GPH)707.9
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.9529
Distanseseilas Trippeltall svak vind0.7367
Distanseseilas Trippeltall mellomvind0.9598
Distanseseilas Trippeltall sterk vind1.0713
Pølsebane Trippeltall svak vind0.5702
Pølsebane Trippeltall mellomvind0.7858
Pølsebane Trippeltall sterk vind0.9061
Motvind Singeltall0.8796
Medvind Singeltall0.9411
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Coastal/Long Distance685.00.8759
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind682.10.8796
Predominantly Downwind637.60.9411
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore630.00.9524
Cape Doctor Coastal531.11.1297
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7367
Triple Number Coastal/Long Distance Medium0.9598
Triple Number Coastal/Long Distance High1.0713
Triple Number Windward/Leeward Low0.5702
Triple Number Windward/Leeward Medium0.7858
Triple Number Windward/Leeward High0.9061
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7367
Triple Number Coastal/Long Distance Medium0.9598
Triple Number Coastal/Long Distance High1.0713
Triple Number Windward/Leeward Low0.5702
Triple Number Windward/Leeward Medium0.7858
Triple Number Windward/Leeward High0.9061
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Predominantly Upwind682.10.8796
Predominantly Downwind637.60.9411
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.00.8759
Triple Number Coastal/Long Distance Low814.40.7367
Triple Number Coastal/Long Distance Medium625.10.9598
Triple Number Coastal/Long Distance High560.11.0713
Triple Number Windward/Leeward Low1052.30.5702
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1755.61165.7879.3730.6645.0602.1570.7519.3501.8
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low814.40.7367
Triple Number AP Medium625.20.9597
Triple Number AP High560.11.0713
Triple Number Windward/Leeward Low1099.70.5456
Triple Number Windward/Leeward Medium763.60.7858
Triple Number Windward/Leeward High662.20.9061
Single Number Predominant Upwind710.60.8444
Single Number Predominant Reaching628.00.9555
Single Number Predominant Downwind667.00.8995
Predominant Upwind - Low986.30.6083
Predominant Upwind - Low/Med750.50.7995
Predominant Upwind - Medium659.20.9102
Predominant Upwind - Med/High615.70.9745
Predominant Upwind - High599.31.0012
Predominant Downwind Low986.20.6084
Predominant Downwind Low/Med723.90.8288
Predominant Downwind Medium613.20.9784
Predominant Downwind Med/High549.41.0920
Predominant Downwind High513.81.1678
Predominant Reaching Low874.00.6865
Predominant Reaching Low/Med665.20.9020
Predominant Reaching Medium584.91.0258
Predominant Reaching Med/High541.91.1073
Predominant Reaching High516.31.1621
SA/DSPL Upwind20.18SA/DSPL Downwind34.69
Scoring OptionTODTOT
5-Band Windward/Leeward Low1231.90.4871
5-Band Windward/Leeward Low/Med894.90.6705
5-Band Windward/Leeward Medium748.70.8014
5-Band Windward/Leeward Med/High671.10.8941
5-Band Windward/Leeward High641.90.9347
Windward/Leeward 60-40 Low1237.40.4849
Windward/Leeward 60-40 Low/Med906.40.6620
Windward/Leeward 60-40 Medium765.30.7840
Windward/Leeward 60-40 Med/High693.10.8656
Windward/Leeward 60-40 High668.30.8978
5-Band AP Low899.80.6668
5-Band AP Low/Med709.30.8459
5-Band AP Medium616.20.9737
5-Band AP Med/High566.81.0585
5-Band AP High543.21.1046
5-Band SF Bay Tour - Low1060.20.5659
5-Band SF Bay Tour - Low/Med857.10.7000
5-Band SF Bay Tour - Medium726.10.8263
5-Band SF Bay Tour - Med/High658.30.9114
5-Band SF Bay Tour - High631.30.9504
Chicago-Mac Upwind0.8179
Chicago-Mac All Purpose0.8452
Chicago-Mac Downwind0.8669
Bayview-Mac Cove Island0.6143
Bayview-Mac Shore0.6190
Harvest Moon Regatta548.91.0930
Club Certificate2025
VellamoNOR 5477
Norges Seilforbund
Sognsveien 73
0854 OSLO
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassMAMBA 311MeasurementHINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA9.350Max. Beam3.082Draft1.613Displacement3,502Wetted area17.61IMS L7.827LSM07.619Acc. length9.325Sink (kg/mm) 12.73
VCGD-0.050VCGM-0.049RM Rated (kg·m) 60.3Limit of positive stability(°) N/AStability IndexN/ADefault crew weight467Declared crew weightN/A
PROPELLER
Propeller TypeFolding 2 blades
InstallationStrutTwin screwNoHydro generatorNo
PRD0.380PBWPIPA0.0033
EDL1.600ST10.050ST20.170
ST30.170ST40.100ST50.300
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerYesMainsail furlerArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders1Rotating mastNo
P11.780IG10.150ISP10.260MDT10.117MDL10.170MDT20.000MDL20.000TLNo TaperMW0.000GO0.000
E3.600J3.430BAS1.360FSDFoilSFJ0.310SPL3.610WPLTPS0.000BD0.000MWT0.00MCG0.000
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered-0.050Flotation Date01/01/2015
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Club Certificate2025
VellamoNOR 5477
Norges Seilforbund
Sognsveien 73
0854 OSLO
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment235-2023090809180.130.731.342.312.9925.0408/09/2023
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment235-2023032810120.070.490.951.953.004.1110.84NoNo 21.6928/03/2023
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment235-20250402172311.0911.0511.076.005.9755.2902/04/2025
CRUISER/RACER REQUIREMENTS*
Accommodation length9.3 mTable area0.44 m²Headroom1.65 mMinimum number of berths4Personal gear stowage0.16 m³Fresh water capacity66 lMinimum number of seats in cockpit4Food stowage0.24 m³Fuel capacity36 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.