Club Certificate2025
LIN YUNCHN 45
ORC
Central Rating Office
Issuing certificates for
CHINA
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 Angles43.8°43.8°41.9°40.3°39.1°38.5°38.2°38.1°38.9°
Beat VMG2.793.864.715.355.735.926.026.106.06
52°4.395.937.057.748.138.348.448.568.58
60°4.726.287.337.958.328.578.718.868.92
75°4.956.537.528.108.488.819.079.369.54
90°4.856.417.448.178.648.979.199.7810.18
110°4.546.257.558.318.859.369.8510.6611.36
120°4.406.097.398.188.739.269.8011.1212.49
135°3.895.466.767.718.338.849.3510.5612.48
150°3.204.575.796.847.678.238.679.6110.77
Run VMG2.773.965.025.926.657.307.898.809.68
Gybe Angles142.1°142.1°146.0°149.3°151.2°161.2°173.2°178.1°177.2°
APH ToD:493.7CDL: 11.705APH ToT: 1.2152CertNo:
BOAT
ClassDUFOUR 45EDesignerFELCIBuilderAge dateSeries date01/2008Offset fileDUFOUR45E.offData fileCHN45
HULL
Length Overall13.600 mMaximum Beam4.308 mDraft2.252 mDisplacement9,428 kgDLR5.7703IMS DivisionCruiser/RacerDynamic Allowance0.090%Age Allowance0.487%
PROPELLER
InstallationStrutTypeFolding 3 bladesDiameter0.380m
CREW
Maximum weight869 kg(default)Minimum weight739 kg ✱ when appliedNon Manual PowerCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail58.9559.45Headsail Luffed58.5958.59Headsail FlyingSymmetricAsymmetric86.36126.99 (All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS (m²)
Trysail19.33Storm Jib17.45Heavy Weather Jib47.11
SAIL LIMITS
Headsails7
✱ Woven polyester sails
Spinnakers5
✱ Asymmetric may be tacked on the pole
STABILITY
Righting MomentN/AStability IndexN/A
COMMENTS
data derived from 39 certificates
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
LIN YUNCHN 45
ORC
Central Rating Office
Issuing certificates for
CHINA
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 VMG1291.2933.1763.8673.2627.9608.4598.1590.4594.1
52°820.6606.8511.0464.9442.7431.8426.5420.8419.4
60°763.4573.1491.0452.7432.5420.2413.5406.4403.5
75°726.6551.7478.7444.6424.4408.7397.0384.5377.4
90°742.8562.0483.6440.4416.7401.3391.9368.1353.7
110°792.4575.6477.1433.3406.8384.5365.4337.6316.9
120°818.3591.4487.3440.0412.5388.9367.4323.8288.2
135°925.1659.6532.9466.6432.1407.5385.0340.9288.6
150°1125.9787.4621.4526.3469.2437.2415.1374.7334.2
Run VMG1299.6909.2717.5607.7541.0493.2456.3408.9371.8
Selected Courses
Windward / Leeward1294.9921.1740.6640.5584.5550.8527.2499.7482.9
All purpose974.8705.6579.3512.8476.2453.4437.3413.5395.5
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward611.40.9813
All purpose493.71.2152
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.8759
Downwind "popa"1.0160
70% up, 30% down "Ilhabela"0.9137
30% up, 70% down "Ilhabela-inverso"0.9695
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Predominantly Upwind531.81.1283
Predominantly Downwind507.81.1815
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low642.50.9339
Triple Number AP Medium491.41.2211
Triple Number AP High432.41.3875
Triple Number Windward/Leeward Low867.30.6918
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Single Number Predominant Upwind552.71.0856
Single Number Predominant Reaching491.01.2219
Single Number Predominant Downwind528.71.1348
Predominant Upwind - Low771.30.7779
Predominant Upwind - Low/Med586.81.0225
Predominant Upwind - Medium513.31.1689
Predominant Upwind - Med/High475.81.2610
Predominant Upwind - High458.51.3085
Predominant Downwind Low779.50.7698
Predominant Downwind Low/Med576.81.0403
Predominant Downwind Medium489.41.2260
Predominant Downwind Med/High432.61.3869
Predominant Downwind High396.11.5149
Predominant Reaching Low687.40.8729
Predominant Reaching Low/Med525.51.1417
Predominant Reaching Medium459.11.3069
Predominant Reaching Med/High418.71.4331
Predominant Reaching High391.71.5319
SA/DSPL Upwind26.14SA/DSPL Downwind32.32
Scoring OptionTODTOT
5-Band Windward/Leeward Low969.60.6188
5-Band Windward/Leeward Low/Med708.90.8464
5-Band Windward/Leeward Medium596.41.0061
5-Band Windward/Leeward Med/High531.41.1292
5-Band Windward/Leeward High501.51.1963
Windward/Leeward 60-40 Low971.70.6175
Windward/Leeward 60-40 Low/Med714.40.8398
Windward/Leeward 60-40 Medium605.30.9912
Windward/Leeward 60-40 Med/High545.31.1003
Windward/Leeward 60-40 High519.71.1545
5-Band AP Low709.20.8460
5-Band AP Low/Med559.21.0729
5-Band AP Medium483.81.2401
5-Band AP Med/High439.31.3659
5-Band AP High414.51.4474
5-Band SF Bay Tour - Low834.90.7186
5-Band SF Bay Tour - Low/Med676.20.8874
5-Band SF Bay Tour - Medium573.71.0459
5-Band SF Bay Tour - Med/High516.31.1621
5-Band SF Bay Tour - High488.61.2280
Chicago-Mac Upwind1.0500
Chicago-Mac All Purpose1.0745
Chicago-Mac Downwind1.0910
Bayview-Mac Cove Island0.7818
Bayview-Mac Shore0.7880
Harvest Moon Regatta427.51.4037
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance539.0
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating539.01.1133
FinRating, kevyt tuuli951.01.0516
FinRating, kova tuuli415.81.2024
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance1.1133
Triple Number Coastal/Long Distance Low0.9339
Triple Number Coastal/Long Distance Medium1.2212
Triple Number Coastal/Long Distance High1.3875
Triple Number Windward/Leeward Low0.7221
Triple Number Windward/Leeward Medium0.9873
Triple Number Windward/Leeward High1.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
For information
General Purpose Handicap (GPH)555.8
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low642.5
Triple Number Coastal/Long Distance Medium491.3
Triple Number Coastal/Long Distance High432.4
Triple Number Windward/Leeward Low830.9
Triple Number Windward/Leeward Medium607.7
Triple Number Windward/Leeward High522.8
Predominantly Upwind531.8
Predominantly Downwind507.8
Predominantly Reaching483.7
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9339
Triple Number Coastal/Long Distance Medium1.2212
Triple Number Coastal/Long Distance High1.3875
Triple Number Windward/Leeward Low0.7221
Triple Number Windward/Leeward Medium0.9873
Triple Number Windward/Leeward High1.1477
Coastal/Long Distance1.1133
Predominantly Upwind1.1283
Predominantly Downwind1.1815
For information
General Purpose Handicap (GPH)555.8
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)1.2152
Distanseseilas Trippeltall svak vind0.9339
Distanseseilas Trippeltall mellomvind1.2212
Distanseseilas Trippeltall sterk vind1.3875
Pølsebane Trippeltall svak vind0.7221
Pølsebane Trippeltall mellomvind0.9873
Pølsebane Trippeltall sterk vind1.1477
Motvind Singeltall1.1283
Medvind Singeltall1.1815
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Coastal/Long Distance539.01.1133
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind531.81.1283
Predominantly Downwind507.81.1815
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore488.01.2296
Cape Doctor Coastal400.91.4965
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9339
Triple Number Coastal/Long Distance Medium1.2212
Triple Number Coastal/Long Distance High1.3875
Triple Number Windward/Leeward Low0.7221
Triple Number Windward/Leeward Medium0.9873
Triple Number Windward/Leeward High1.1477
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9339
Triple Number Coastal/Long Distance Medium1.2212
Triple Number Coastal/Long Distance High1.3875
Triple Number Windward/Leeward Low0.7221
Triple Number Windward/Leeward Medium0.9873
Triple Number Windward/Leeward High1.1477
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Predominantly Upwind531.81.1283
Predominantly Downwind507.81.1815
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance539.01.1133
Triple Number Coastal/Long Distance Low642.50.9339
Triple Number Coastal/Long Distance Medium491.31.2212
Triple Number Coastal/Long Distance High432.41.3875
Triple Number Windward/Leeward Low830.90.7221
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1376.9919.9696.7577.7508.3471.1442.5393.6373.7
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low642.50.9339
Triple Number AP Medium491.41.2211
Triple Number AP High432.41.3875
Triple Number Windward/Leeward Low867.30.6918
Triple Number Windward/Leeward Medium607.70.9873
Triple Number Windward/Leeward High522.81.1477
Single Number Predominant Upwind552.71.0856
Single Number Predominant Reaching491.01.2219
Single Number Predominant Downwind528.71.1348
Predominant Upwind - Low771.30.7779
Predominant Upwind - Low/Med586.81.0225
Predominant Upwind - Medium513.31.1689
Predominant Upwind - Med/High475.81.2610
Predominant Upwind - High458.51.3085
Predominant Downwind Low779.50.7698
Predominant Downwind Low/Med576.81.0403
Predominant Downwind Medium489.41.2260
Predominant Downwind Med/High432.61.3869
Predominant Downwind High396.11.5149
Predominant Reaching Low687.40.8729
Predominant Reaching Low/Med525.51.1417
Predominant Reaching Medium459.11.3069
Predominant Reaching Med/High418.71.4331
Predominant Reaching High391.71.5319
SA/DSPL Upwind26.14SA/DSPL Downwind32.32
Scoring OptionTODTOT
5-Band Windward/Leeward Low969.60.6188
5-Band Windward/Leeward Low/Med708.90.8464
5-Band Windward/Leeward Medium596.41.0061
5-Band Windward/Leeward Med/High531.41.1292
5-Band Windward/Leeward High501.51.1963
Windward/Leeward 60-40 Low971.70.6175
Windward/Leeward 60-40 Low/Med714.40.8398
Windward/Leeward 60-40 Medium605.30.9912
Windward/Leeward 60-40 Med/High545.31.1003
Windward/Leeward 60-40 High519.71.1545
5-Band AP Low709.20.8460
5-Band AP Low/Med559.21.0729
5-Band AP Medium483.81.2401
5-Band AP Med/High439.31.3659
5-Band AP High414.51.4474
5-Band SF Bay Tour - Low834.90.7186
5-Band SF Bay Tour - Low/Med676.20.8874
5-Band SF Bay Tour - Medium573.71.0459
5-Band SF Bay Tour - Med/High516.31.1621
5-Band SF Bay Tour - High488.61.2280
Chicago-Mac Upwind1.0500
Chicago-Mac All Purpose1.0745
Chicago-Mac Downwind1.0910
Bayview-Mac Cove Island0.7818
Bayview-Mac Shore0.7880
Harvest Moon Regatta427.51.4037
Club Certificate2025
LIN YUNCHN 45
ORC
Central Rating Office
Issuing certificates for
CHINA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassDUFOUR 45EMeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA13.600Max. Beam4.308Draft2.252Displacement9,428Wetted area38.34IMS L12.100LSM011.777Acc. length13.600Sink (kg/mm) 29.88
VCGD-0.456VCGM-0.292RM Rated (kg·m) 388.4Limit of positive stability(°) N/AStability IndexN/ADefault crew weight869Declared crew weightN/A
PROPELLER
Propeller TypeFolding 3 blades
InstallationStrutTwin screwNoHydro generatorNo
PRD0.380PBWPIPA0.0006
EDLST1ST2
ST3ST4ST5
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders3Rotating mastNo
P17.350IG18.680ISP19.170MDT10.100MDL10.110MDT2MDL2TLTaperMWGO
E6.365J5.005BAS1.900FSDNo FoilSFJ0.400SPL5.579WPLTPS6.325BDMWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM entered directlyRM entered388.4Flotation Date01/01/2013
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Club Certificate2025
LIN YUNCHN 45
ORC
Central Rating Office
Issuing certificates for
CHINA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment10.161.101.973.544.8058.95
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment10.060.801.603.244.996.6817.75NoNo 58.59
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateComment114.9313.1014.027.487.05106%86.36
CRUISER/RACER REQUIREMENTS*
Accommodation length13.6 mTable area0.66 m²Headroom1.87 mMinimum number of berths6Personal gear stowage0.24 m³Fresh water capacity228 lMinimum number of seats in cockpit6Food stowage0.36 m³Fuel capacity122 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.