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Rated boat velocities in knots| Wind Velocity | 6 kt
| 8 kt
| 10 kt
| 12 kt
| 14 kt
| 16 kt
| 20 kt
| 24 kt
|
| Beat Angles | 44.3° | 42.0° | 40.8° | 40.1° | 39.7° | 39.6° | 39.7° | 40.7° |
| Beat VMG | 2.81 | 3.44 | 3.88 | 4.19 | 4.38 | 4.46 | 4.48 | 4.40 |
| 52° | 4.32 | 5.14 | 5.71 | 6.07 | 6.26 | 6.36 | 6.41 | 6.39 |
| 60° | 4.55 | 5.37 | 5.92 | 6.24 | 6.43 | 6.54 | 6.61 | 6.62 |
| 75° | 4.69 | 5.54 | 6.09 | 6.40 | 6.60 | 6.75 | 6.92 | 6.98 |
| 90° | 4.83 | 5.78 | 6.33 | 6.60 | 6.73 | 6.84 | 7.12 | 7.30 |
| 110° | 4.93 | 5.93 | 6.47 | 6.80 | 7.05 | 7.25 | 7.52 | 7.74 |
| 120° | 4.78 | 5.80 | 6.42 | 6.78 | 7.07 | 7.34 | 7.83 | 8.16 |
| 135° | 4.34 | 5.37 | 6.13 | 6.58 | 6.90 | 7.21 | 7.78 | 8.41 |
| 150° | 3.71 | 4.69 | 5.48 | 6.01 | 6.36 | 6.62 | 7.08 | 7.53 |
| Run VMG | 3.22 | 4.06 | 4.74 | 5.21 | 5.51 | 6.01 | 6.63 | 7.08 |
| Gybe Angles | 145.6° | 146.8° | 146.6° | 147.6° | 167.6° | 173.6° | 176.8° | 176.8° |
APH ToD:652.0CDL: 7.018APH ToT: 0.9202CertNo:
BOATClassMamba 31DesignerBengt KarlssonBuilderBK Marin ABAge date01.1981Series date01.1979Offset fileMamba31cor.offData fileUFO_AH0649RUS78_Mamba
HULLLength Overall9.250 mMaximum Beam3.082 mDraft1.677 mDisplacement4 350 kgDLR8.4638IMS DivisionCruiser/RacerDynamic Allowance0.520%Age Allowance0.487%
PROPELLERInstallationShaft exposedTypeFeathering 2 bladesDiameter0.428m
CREWMaximum weight390 kg(declared)Minimum weight260 kg
* when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS
(m²)
MeasuredRatedMainsail19.4719.79Headsail Luffed23.0423.04Headsail FlyingSymmetricAsymmetric65.0565.05
(All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS
(m²)
Trysail5.55Storm Jib7.03Heavy Weather Jib18.97
SAIL LIMITSHeadsails1
Spinnakers4
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
LOA9.250Max. Beam3.082Draft1.677Displacement4 350Wetted area19.39IMS L7.984LSM08.009Acc. length9.250Sink (kg/mm)
14.11
VCGD0.191VCGM0.127RM Rated
(kg·m)
60.0Limit of positive stability(°)
N/AStability IndexN/ADefault crew weight502Declared crew weight390
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 footRunners/Checkstays0Spreaders1Rotating mastNo
P10.390IG11.750ISP11.770MDT10.115MDL10.180MDT2MDL2TLNo TaperMW0.180GO0.210
E3.050J3.500BAS1.300FSD0.031SFJ0.300SPLWPLTPS4.465BD0.105MWT72.38MCG4.838
Flying Headsail Foretriangles
IdISPTPS
FLOTATION AND STABILITYCalculation methodPoles incliningFlotation Date25.04.2023Comment
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 23.0415.05.2024
SYMMETRIC SPINNAKERIdSLUSLESLSHWSFLAreaMeas.DateComment
ASYMMETRIC SPINNAKERIdSLUSLESLSHWSFLRatioAreaMeas.DateCommentAS-110.7712.6011.696.706.60102%65.0513.10.2024
MIZZEN STAYSAILIdYSHFYSHWYSFLAreaMeas.DateComment
QUADRILATERALIdQLEQHLQFLQCDQLMMastAreaMeas.DateComment
CRUISER/RACER REQUIREMENTS*Accommodation length9.2 mTable area0.44 m²Headroom1.64 mMinimum number of berths4Personal gear stowage0.16 m³Fresh water capacity64 lMinimum number of seats in cockpit4Food stowage0.24 m³Fuel capacity34 l
*This list refers to the calculated requirements. See IMS Appendix 1 for the complete list of requirements.