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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 | 41.5° | 41.5° | 39.2° | 37.4° | 36.6° | 36.2° | 35.9° | 35.6° | 36.3° |
| Beat VMG | 3.03 | 4.07 | 4.79 | 5.19 | 5.37 | 5.48 | 5.55 | 5.63 | 5.62 |
| 52° | 4.66 | 6.06 | 6.86 | 7.22 | 7.39 | 7.49 | 7.56 | 7.65 | 7.69 |
| 60° | 4.93 | 6.31 | 7.03 | 7.37 | 7.56 | 7.66 | 7.74 | 7.86 | 7.92 |
| 75° | 5.10 | 6.47 | 7.15 | 7.49 | 7.72 | 7.90 | 8.02 | 8.19 | 8.32 |
| 90° | 4.96 | 6.36 | 7.12 | 7.55 | 7.83 | 8.02 | 8.22 | 8.51 | 8.74 |
| 110° | 4.64 | 6.17 | 7.18 | 7.68 | 8.06 | 8.38 | 8.68 | 9.13 | 9.55 |
| 120° | 4.45 | 5.99 | 7.05 | 7.60 | 8.00 | 8.37 | 8.75 | 9.58 | 10.35 |
| 135° | 3.87 | 5.36 | 6.52 | 7.25 | 7.70 | 8.10 | 8.50 | 9.43 | 11.12 |
| 150° | 3.19 | 4.49 | 5.61 | 6.56 | 7.22 | 7.64 | 8.01 | 8.78 | 9.78 |
| Run VMG | 2.76 | 3.89 | 4.86 | 5.68 | 6.36 | 6.96 | 7.44 | 8.17 | 8.91 |
| Gybe Angles | 142.2° | 142.2° | 147.0° | 150.2° | 158.5° | 171.8° | 178.1° | 179.0° | 178.4° |
APH ToD:526.7CDL: 9.953APH ToT: 1.1392CertNo:35216
BOATClassYOK 41DesignerI.YOKOYAMABuilderTSUBOI, JAPANAge date08.1985Series date08.1985Offset fileJCBIY54.offData fileRU3521_Alaska
HULLLength Overall12.410 mMaximum Beam3.860 mDraft2.290 mDisplacement6 495 kgDLR7.4850IMS DivisionCruiser/RacerDynamic Allowance0.000%Age Allowance0.487%
PROPELLERInstallationShaft exposedTypeFeathering 2 bladesDiameter0.530m
CREWMaximum weight643 kg(default)Minimum weight513 kg
✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS
(m²)
MeasuredRatedMainsail51.6652.53Headsail Luffed46.2646.26Headsail FlyingSymmetric92.2792.27Asymmetric107.62107.62
(All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS
(m²)
Trysail15.59Storm Jib10.49Heavy Weather Jib28.31
SAIL LIMITSHeadsails6Spinnakers5✱ Asymmetric may be tacked on the pole
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)ClassYOK 41Measurement09.06.2017HINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA12.410Max. Beam3.860Draft2.290Displacement6 495Wetted area26.81IMS L9.968LSM09.537Acc. length11.696Sink (kg/mm)
20.63
VCGD0.031VCGM0.004RM Rated
(kg·m)
160.5Limit of positive stability(°)
N/AStability IndexN/ADefault crew weight643Declared crew weightN/A
PROPELLERPropeller TypeFeathering 2 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.530PBWPIPA0.0036
PSDPHDPHL
PSAESL
ST1ST2ST3
ST4ST5
RIGForestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footRunning backstays2CheckstaysSpreaders3Rotating mastNo
P16.045IG14.480ISP14.530MDT10.108MDL10.180MDT2MDL2TLTaperMWGO
E5.550J4.290BAS1.785FSD0.035SFJ0.000SPL4.366WPLTPS5.300BDMWTMCG
Flying Headsail Foretriangles
IdISPTPS
FLOTATION AND STABILITYCalculation methodRM estimatedFlotation Date09.06.2023MeasurerRUS 92
INVENTORYFixed Ballast Total0
Total deductible
Total deductible
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MAINSAILIdMHBMUWMTWMHWMQWAreaMeas.DateComment20.221.102.003.454.5551.66
MIZZENIdMHBMUWMTWMHWMQWAreaMeas.DateComment
HEADSAILIdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment50.050.841.603.124.726.2514.70NoNo 46.2609.06.2017
SYMMETRIC SPINNAKERIdSLUSLESLSHWSFLAreaMeas.DateComment414.3514.3514.357.727.7092.27
ASYMMETRIC SPINNAKERIdSLUSLESLSHWSFLRatioAreaMeas.DateComment616.0014.5615.288.448.5099%107.6208.06.2023
MIZZEN STAYSAILIdYSHFYSHWYSFLAreaMeas.DateComment
QUADRILATERALIdQLEQHLQFLQCDQLMMastAreaMeas.DateComment
CRUISER/RACER REQUIREMENTS*Accommodation length11.7 mTable area0.55 m²Headroom1.80 mMinimum number of berths5Personal gear stowage0.20 m³Fresh water capacity142 lMinimum number of seats in cockpit5Food stowage0.30 m³Fuel capacity84 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.