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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 Angles | 44.3° | 44.3° | 41.9° | 40.8° | 40.4° | 40.6° | 40.7° | 41.2° | 42.4° |
| Beat VMG | 2.00 | 2.77 | 3.37 | 3.79 | 4.06 | 4.20 | 4.27 | 4.29 | 4.19 |
| 52° | 3.16 | 4.26 | 5.04 | 5.59 | 5.92 | 6.10 | 6.20 | 6.27 | 6.23 |
| 60° | 3.36 | 4.49 | 5.27 | 5.80 | 6.11 | 6.29 | 6.40 | 6.48 | 6.48 |
| 75° | 3.45 | 4.62 | 5.44 | 5.98 | 6.28 | 6.48 | 6.62 | 6.79 | 6.85 |
| 90° | 3.36 | 4.53 | 5.38 | 5.97 | 6.31 | 6.53 | 6.70 | 6.98 | 7.15 |
| 110° | 2.94 | 4.09 | 5.03 | 5.76 | 6.23 | 6.53 | 6.75 | 7.13 | 7.46 |
| 120° | 2.76 | 3.89 | 4.83 | 5.59 | 6.12 | 6.45 | 6.69 | 7.10 | 7.49 |
| 135° | 2.38 | 3.45 | 4.40 | 5.16 | 5.80 | 6.23 | 6.51 | 6.95 | 7.36 |
| 150° | 2.01 | 2.98 | 3.90 | 4.67 | 5.33 | 5.88 | 6.26 | 6.75 | 7.15 |
| Run VMG | 1.74 | 2.58 | 3.39 | 4.13 | 4.78 | 5.36 | 5.86 | 6.50 | 6.91 |
| Gybe Angles | 150.5° | 150.5° | 155.5° | 164.6° | 171.2° | 174.5° | 176.8° | 178.4° | 178.5° |
APH ToD:697.7CDL: 6.715APH ToT: 0.8599CertNo:
BOATClassMamba 31DesignerBengt KarlssonBuilderBK Marin ABAge date01.1981Series date01.1979Offset fileMamba31RM_V3.offData fileUFO_AH0649RUS78_Mamba
HULLLength Overall9.290 mMaximum Beam3.016 mDraft1.654 mDisplacement4 713 kgDLR10.5132IMS DivisionCruiser/RacerDynamic Allowance0.670%Age Allowance0.487%
PROPELLERInstallationShaft exposedTypeFeathering 2 bladesDiameter0.428m
CREWMaximum weight350 kg(declared)Minimum weight220 kg
✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS
(m²)
MeasuredRatedMainsail19.4719.79Headsail Luffed23.0423.04Headsail FlyingSymmetricAsymmetric
STORM SAIL AREAS
(m²)
Trysail5.55Storm Jib7.03Heavy Weather Jib18.97
SAIL LIMITSHeadsails1✱ One set on the forestay
✱ Zero set flying
Spinnakers0✱ Spinnaker pole aboard
STABILITYRighting 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.
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Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)ClassMamba 31Measurement25.04.2023HINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA9.290Max. Beam3.016Draft1.654Displacement4 713Wetted area19.43IMS L7.771LSM07.653Acc. length9.290Sink (kg/mm)
13.21
VCGD-0.015VCGM-0.009RM Rated
(kg·m)
60.4Limit of positive stability(°)
N/AStability IndexN/ADefault crew weight470Declared crew weight350
PROPELLERPropeller TypeFeathering 2 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.428PBW0.136PIPA0.0036
PSD0.025PHD0.065PHL0.094
PSA12.0°ESL0.880
ST10.025ST20.097ST30.100
ST40.048ST50.165
RIGForestay tensionAftInner stayFixedMast materialAluminumSingle headsail furlerYesMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footRunning backstays0CheckstaysSpreaders1Rotating mastNo
P10.390IG11.750ISP11.770MDT10.115MDL10.180MDT2MDL2TLNo TaperMW0.180GO0.210
E3.050J3.500BAS1.300FSD0.031SFJ0.300SPL3.635WPLTPS4.465BD0.105MWT72.38MCG4.838
Flying Headsail Foretriangles
IdISPTPS
FLOTATION AND STABILITYCalculation methodPoles incliningFlotation Date25.04.2023
W132.5W232.5W332.5W432.5
PD1106.0PD2110.0PD3105.0PD4107.0
WD10.150PLM2250.00GSA50.0RSA50.0RM60.7
INVENTORYIdDescriptionWeight SailingLCGVCGGAIdDescriptionWeight SailingLCGVCGGA0045.220.50
0011.50
0029.231.10
INVENTORYFixed Ballast Total0
Total deductible
OTHER ITEMSIdKindDescriptionWeightLCGVCG002Anchor169.231.10001Chain241.50004Tools405.220.50Total deductible804.910.47
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MAINSAILIdMHBMUWMTWMHWMQWAreaMeas.DateCommentM-New0.120.651.172.122.6219.4711.05.2024
MIZZENIdMHBMUWMTWMHWMQWAreaMeas.DateComment
HEADSAILIdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentH-New0.060.480.931.973.124.2711.22NoNo 23.04
SYMMETRIC SPINNAKERIdSLUSLESLSHWSFLAreaMeas.DateComment
ASYMMETRIC SPINNAKERIdSLUSLESLSHWSFLRatioAreaMeas.DateComment
MIZZEN STAYSAILIdYSHFYSHWYSFLAreaMeas.DateComment
QUADRILATERALIdQLEQHLQFLQCDQLMMastAreaMeas.DateComment
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.