Club Certificate2025
ButterflyNOR 8100
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 Angles43.0°43.0°40.8°39.5°39.3°38.9°38.8°38.9°39.7°
Beat VMG2.273.123.764.154.344.424.474.514.45
52°3.544.735.535.986.196.276.326.376.37
60°3.774.975.746.146.356.446.496.556.57
75°3.865.105.876.286.516.666.746.846.89
90°3.714.985.846.316.546.756.927.117.23
110°3.654.975.926.436.757.007.187.437.51
120°3.474.785.766.356.717.017.307.778.11
135°3.074.285.296.046.496.837.167.858.71
150°2.533.664.685.536.156.546.857.488.27
Run VMG2.193.174.064.825.486.016.406.997.58
Gybe Angles147.1°147.1°151.6°155.2°162.4°169.1°177.2°178.1°177.2°
APH ToD:637.2CDL: 7.014APH ToT: 0.9416CertNo:5624
BOAT
ClassMAMBA 29DesignerJanBeckerBuilderAge dateSeries date01/1981Offset filemamba29sc.offData file5624
HULL
Length Overall8.700 mMaximum Beam2.626 mDraft1.572 mDisplacement3,168 kgDLR8.2252IMS DivisionCruiser/RacerDynamic Allowance0.230%Age Allowance0.487%
PROPELLER
InstallationStrutTypeFolding 2 bladesDiameter0.340m
CREW
Maximum weight437 kg(default)Minimum weight307 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail21.3621.61Headsail Luffed26.3126.31Headsail FlyingSymmetric54.6454.64Asymmetric
STORM SAIL AREAS (m²)
Trysail6.21Storm Jib6.27Heavy Weather Jib16.91
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
ButterflyNOR 8100
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 VMG1585.61155.1957.8866.5830.2813.6804.9798.7808.9
52°1015.9760.7650.6602.2581.9574.1569.9565.1565.3
60°955.8724.2627.7585.9566.9559.0554.7549.2548.0
75°932.0706.5613.0573.5552.8540.4534.1526.0522.1
90°970.1723.4616.1570.2550.5533.5520.5506.6498.2
110°987.4724.5607.9560.2533.7514.4501.6484.3479.5
120°1036.5753.5624.6567.0536.9513.4493.4463.0443.7
135°1174.4840.6680.7595.6554.6527.0502.9458.9413.4
150°1420.6983.5769.4651.6585.8550.7525.2481.0435.6
Run VMG1642.71135.6887.2747.3656.4599.4562.6514.7474.8
Selected Courses
Windward / Leeward1612.41145.4922.5806.9743.3706.5683.7656.7641.9
All purpose1222.3886.1730.4654.3615.7593.1578.0557.3544.0
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward776.40.7728
All purpose637.20.9416
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.6745
Downwind "popa"0.8230
70% up, 30% down "Ilhabela"0.7131
30% up, 70% down "Ilhabela-inverso"0.7720
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Predominantly Upwind688.70.8711
Predominantly Downwind644.60.9309
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low808.20.7424
Triple Number AP Medium632.60.9485
Triple Number AP High574.01.0452
Triple Number Windward/Leeward Low1080.40.5553
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Single Number Predominant Upwind715.60.8385
Single Number Predominant Reaching636.20.9432
Single Number Predominant Downwind673.70.8906
Predominant Upwind - Low966.30.6209
Predominant Upwind - Low/Med747.20.8030
Predominant Upwind - Medium668.40.8977
Predominant Upwind - Med/High631.80.9497
Predominant Upwind - High616.80.9728
Predominant Downwind Low983.20.6103
Predominant Downwind Low/Med728.00.8242
Predominant Downwind Medium622.10.9645
Predominant Downwind Med/High559.11.0732
Predominant Downwind High523.61.1459
Predominant Reaching Low872.20.6879
Predominant Reaching Low/Med671.10.8941
Predominant Reaching Medium595.21.0080
Predominant Reaching Med/High552.61.0857
Predominant Reaching High528.61.1351
SA/DSPL Upwind22.02SA/DSPL Downwind35.10
Scoring OptionTODTOT
5-Band Windward/Leeward Low1206.90.4972
5-Band Windward/Leeward Low/Med888.10.6756
5-Band Windward/Leeward Medium757.70.7919
5-Band Windward/Leeward Med/High688.00.8721
5-Band Windward/Leeward High658.80.9107
Windward/Leeward 60-40 Low1208.20.4966
Windward/Leeward 60-40 Low/Med897.70.6684
Windward/Leeward 60-40 Medium774.50.7747
Windward/Leeward 60-40 Med/High711.90.8428
Windward/Leeward 60-40 High687.40.8729
5-Band AP Low894.30.6709
5-Band AP Low/Med709.60.8456
5-Band AP Medium624.70.9604
5-Band AP Med/High580.31.0340
5-Band AP High558.61.0741
5-Band SF Bay Tour - Low1040.50.5766
5-Band SF Bay Tour - Low/Med851.10.7050
5-Band SF Bay Tour - Medium735.00.8164
5-Band SF Bay Tour - Med/High675.10.8888
5-Band SF Bay Tour - High648.50.9252
Chicago-Mac Upwind0.8154
Chicago-Mac All Purpose0.8399
Chicago-Mac Downwind0.8597
Bayview-Mac Cove Island0.6196
Bayview-Mac Shore0.6243
Harvest Moon Regatta557.21.0768
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance691.4
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating691.40.8678
FinRating, kevyt tuuli1187.30.8423
FinRating, kova tuuli562.00.8897
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.8678
Triple Number Coastal/Long Distance Low0.7424
Triple Number Coastal/Long Distance Medium0.9486
Triple Number Coastal/Long Distance High1.0452
Triple Number Windward/Leeward Low0.5803
Triple Number Windward/Leeward Medium0.7790
Triple Number Windward/Leeward High0.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
For information
General Purpose Handicap (GPH)712.8
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low808.2
Triple Number Coastal/Long Distance Medium632.5
Triple Number Coastal/Long Distance High574.1
Triple Number Windward/Leeward Low1033.9
Triple Number Windward/Leeward Medium770.2
Triple Number Windward/Leeward High679.3
Predominantly Upwind688.7
Predominantly Downwind644.6
Predominantly Reaching621.2
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7424
Triple Number Coastal/Long Distance Medium0.9486
Triple Number Coastal/Long Distance High1.0452
Triple Number Windward/Leeward Low0.5803
Triple Number Windward/Leeward Medium0.7790
Triple Number Windward/Leeward High0.8833
Coastal/Long Distance0.8678
Predominantly Upwind0.8711
Predominantly Downwind0.9309
For information
General Purpose Handicap (GPH)712.8
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.9416
Distanseseilas Trippeltall svak vind0.7424
Distanseseilas Trippeltall mellomvind0.9486
Distanseseilas Trippeltall sterk vind1.0452
Pølsebane Trippeltall svak vind0.5803
Pølsebane Trippeltall mellomvind0.7790
Pølsebane Trippeltall sterk vind0.8833
Motvind Singeltall0.8711
Medvind Singeltall0.9309
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Coastal/Long Distance691.40.8678
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind688.70.8711
Predominantly Downwind644.60.9309
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore646.30.9283
Cape Doctor Coastal548.01.0949
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7424
Triple Number Coastal/Long Distance Medium0.9486
Triple Number Coastal/Long Distance High1.0452
Triple Number Windward/Leeward Low0.5803
Triple Number Windward/Leeward Medium0.7790
Triple Number Windward/Leeward High0.8833
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7424
Triple Number Coastal/Long Distance Medium0.9486
Triple Number Coastal/Long Distance High1.0452
Triple Number Windward/Leeward Low0.5803
Triple Number Windward/Leeward Medium0.7790
Triple Number Windward/Leeward High0.8833
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Predominantly Upwind688.70.8711
Predominantly Downwind644.60.9309
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance691.40.8678
Triple Number Coastal/Long Distance Low808.20.7424
Triple Number Coastal/Long Distance Medium632.50.9486
Triple Number Coastal/Long Distance High574.11.0452
Triple Number Windward/Leeward Low1033.90.5803
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1711.81144.4869.9732.0656.0615.3583.7533.8519.5
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low808.20.7424
Triple Number AP Medium632.60.9485
Triple Number AP High574.01.0452
Triple Number Windward/Leeward Low1080.40.5553
Triple Number Windward/Leeward Medium770.20.7790
Triple Number Windward/Leeward High679.30.8833
Single Number Predominant Upwind715.60.8385
Single Number Predominant Reaching636.20.9432
Single Number Predominant Downwind673.70.8906
Predominant Upwind - Low966.30.6209
Predominant Upwind - Low/Med747.20.8030
Predominant Upwind - Medium668.40.8977
Predominant Upwind - Med/High631.80.9497
Predominant Upwind - High616.80.9728
Predominant Downwind Low983.20.6103
Predominant Downwind Low/Med728.00.8242
Predominant Downwind Medium622.10.9645
Predominant Downwind Med/High559.11.0732
Predominant Downwind High523.61.1459
Predominant Reaching Low872.20.6879
Predominant Reaching Low/Med671.10.8941
Predominant Reaching Medium595.21.0080
Predominant Reaching Med/High552.61.0857
Predominant Reaching High528.61.1351
SA/DSPL Upwind22.02SA/DSPL Downwind35.10
Scoring OptionTODTOT
5-Band Windward/Leeward Low1206.90.4972
5-Band Windward/Leeward Low/Med888.10.6756
5-Band Windward/Leeward Medium757.70.7919
5-Band Windward/Leeward Med/High688.00.8721
5-Band Windward/Leeward High658.80.9107
Windward/Leeward 60-40 Low1208.20.4966
Windward/Leeward 60-40 Low/Med897.70.6684
Windward/Leeward 60-40 Medium774.50.7747
Windward/Leeward 60-40 Med/High711.90.8428
Windward/Leeward 60-40 High687.40.8729
5-Band AP Low894.30.6709
5-Band AP Low/Med709.60.8456
5-Band AP Medium624.70.9604
5-Band AP Med/High580.31.0340
5-Band AP High558.61.0741
5-Band SF Bay Tour - Low1040.50.5766
5-Band SF Bay Tour - Low/Med851.10.7050
5-Band SF Bay Tour - Medium735.00.8164
5-Band SF Bay Tour - Med/High675.10.8888
5-Band SF Bay Tour - High648.50.9252
Chicago-Mac Upwind0.8154
Chicago-Mac All Purpose0.8399
Chicago-Mac Downwind0.8597
Bayview-Mac Cove Island0.6196
Bayview-Mac Shore0.6243
Harvest Moon Regatta557.21.0768
Club Certificate2025
ButterflyNOR 8100
Norges Seilforbund
Sognsveien 73
0854 OSLO
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassMAMBA 29MeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA8.700Max. Beam2.626Draft1.572Displacement3,168Wetted area16.55IMS L7.556LSM07.275Acc. length8.534Sink (kg/mm) 11.38
VCGD-0.050VCGM-0.042RM Rated (kg·m) 44.6Limit of positive stability(°) N/AStability IndexN/ADefault crew weight437Declared crew weightN/A
PROPELLER
Propeller TypeFolding 2 blades
InstallationStrutTwin screwNoHydro generatorNo
PRD0.340PBWPIPA0.0070
EDL0.400ST10.048ST20.170
ST30.170ST40.170ST51.600
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders1Rotating mastNo
P11.810IG11.190ISP11.190MDT10.110MDL10.140MDT20.000MDL20.000TL0.000MW0.000GO0.000
E3.000J3.300BAS1.358FSD0.000SFJ0.000SPL3.380WPLTPS0.000BD0.000MWT0.00MCG0.000
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
ButterflyNOR 8100
Norges Seilforbund
Sognsveien 73
0854 OSLO
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment426-2009051120030.150.001.151.952.5121.3611/05/2009
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment426-2009051120080.000.000.000.000.004.8410.68NoNo 26.3111/05/2009
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment426-20090511200911.0311.0311.035.910.0054.6411/05/2009
CRUISER/RACER REQUIREMENTS*
Accommodation length8.5 mTable area0.33 m²Headroom1.40 mMinimum number of berths3Personal gear stowage0.12 m³Fresh water capacity38 lMinimum number of seats in cockpit3Food stowage0.18 m³Fuel capacity20 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.