Club Certificate2025
ISLA SIRENA IIESP-5443_C
RFEV
c/ Gamazo sn
39004 Santander – España
crucero@rfev.es
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 Angles43.7°43.7°41.3°40.6°40.3°39.8°39.6°39.5°40.2°
Beat VMG2.583.524.214.634.854.965.035.085.02
52°4.045.366.256.787.037.147.217.287.28
60°4.285.646.506.997.247.357.427.517.53
75°4.455.836.687.167.437.597.707.857.93
90°4.355.756.647.187.517.717.888.148.30
110°4.095.596.707.337.707.998.248.558.78
120°3.975.446.557.247.647.968.268.809.16
135°3.494.876.006.867.387.748.068.689.37
150°2.864.105.206.116.837.307.628.168.72
Run VMG2.473.554.505.295.926.406.817.508.00
Gybe Angles143.1°143.1°147.6°148.9°151.0°156.1°161.3°175.0°175.0°
APH ToD:567.2CDL: 9.264APH ToT: 1.0579CertNo:544301
BOAT
ClassDUFOUR 41 CLDesignerJ&J DESIGNBuilderDUFOURAge date11/1998Series date01/1995Offset fileDUF_41C.OFFData fileE5443_C
HULL
Length Overall11.950Maximum Beam3.976Draft2.026Displacement9,350DLR8.0438IMS DivisionCruiser/RacerDynamic Allowance0.360%Age Allowance0.487%
PROPELLER
InstallationStrutTypeSolid 2 bladesDiameter0.300m
CREW
Maximum weight350(declared)Minimum weight220 ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail41.2542.13Headsail Luffed54.2654.26Headsail FlyingSymmetricAsymmetric117.55103.44 (All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS (m²)
Trysail11.77Storm Jib12.49Heavy Weather Jib33.71
SAIL LIMITS
Headsails5
✱ One set on the forestay
Spinnakers4
✱ Asymmetric SHALL NOT be tacked on the pole
STABILITY
Righting MomentN/AStability IndexN/A
COMMENTS
MEDIDAS ESTIMADAS.
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.
ORC Ref  03510003SV5Issued on 29/05/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
ISLA SIRENA IIESP-5443_C
RFEV
c/ Gamazo sn
39004 Santander – España
crucero@rfev.es
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 VMG1394.71023.9856.0777.8742.7725.2716.2709.1717.0
52°891.8671.3576.3531.3512.1504.1499.5494.5494.6
60°841.2638.5553.7514.9497.3489.6485.1479.2478.0
75°808.5617.3538.9502.9484.8474.1467.6458.8453.7
90°827.1626.5541.9501.6479.5466.9456.7442.5433.6
110°879.8643.6537.3491.0467.5450.6436.9421.1410.2
120°907.1661.6549.6497.3471.2452.2435.8408.9392.8
135°1031.1739.2599.7524.9487.6465.2446.9414.7384.0
150°1260.5878.5692.4589.4527.4493.2472.4441.0412.9
Run VMG1455.31014.4799.5680.6608.5562.8528.8480.1449.9
Selected Courses
Windward / Leeward1423.51019.1827.8729.2675.6644.0622.5594.6583.5
All purpose1074.2783.5649.6583.1548.5528.2514.4496.1485.9
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward703.00.8534
All purpose567.21.0579
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7566
Downwind "popa"0.8984
70% up, 30% down "Ilhabela"0.7942
30% up, 70% down "Ilhabela-inverso"0.8506
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Predominantly Upwind611.80.9807
Predominantly Downwind577.11.0396
Custom scoring options for Canada
Scoring OptionTODTOT
TriNum AP Low716.60.8373
TriNum AP Med563.41.0649
TriNum AP High511.01.1742
TriNum W/L Low963.80.6226
TriNum W/L Med698.20.8593
TriNum W/L Hig617.40.9718
Predom. Upwind634.70.9454
Predom. Reaching561.71.0681
Predom. Downwind602.30.9962
Predom. Up Low852.30.7040
Predom. Up L/M663.80.9039
Predom. Up Med594.11.0100
Predom. Up M/H560.81.0699
Predom. Up High547.01.0969
Predom. Dn Low868.60.6908
Predom. Dn L/M648.50.9252
Predom. Dn Med557.61.0761
Predom. Dn M/H504.11.1901
Predom. Dn High473.71.2666
Predom. Rc Low764.90.7845
Predom. Rc L/M592.91.0120
Predom. Rc Med526.21.1402
Predom. Rc M/H489.71.2253
Predom. Rc High469.51.2780
SA/DSPL Upwind21.36SA/DSPL Downwind35.51
Scoring OptionTODTOT
5B W/L Low1072.80.5593
5B W/L L/M798.70.7512
5B W/L Med687.40.8728
5B W/L M/H625.90.9586
5B W/L High597.51.0042
W/L 60-40 Low1073.10.5591
W/L 60-40 L/M806.30.7442
W/L 60-40 Med700.50.8565
W/L 60-40 M/H644.50.9310
W/L 60-40 High620.30.9672
5B AP Low789.30.7602
5B AP L/M630.90.9510
5B AP Med556.41.0784
5B AP M/H516.51.1617
5B AP High497.51.2061
5B SF Bay Low925.70.6482
5B SF Bay L/M762.70.7866
5B SF Bay Med662.10.9062
5B SF Bay M/H608.70.9857
5B SF Bay High584.51.0265
Chicago-Mac Upwind0.9187
Chicago-Mac All Purpose0.9435
Chicago-Mac Downwind0.9621
BayMac Cove Island858.00.6993
BayMac Shore851.00.7050
Harvest Moon494.21.2141
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance617.9
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating617.90.9710
FinRating, kevyt tuuli1052.50.9501
FinRating, kova tuuli501.00.9980
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.9710
Triple Number Coastal/Long Distance Low0.8373
Triple Number Coastal/Long Distance Medium1.0650
Triple Number Coastal/Long Distance High1.1742
Triple Number Windward/Leeward Low0.6497
Triple Number Windward/Leeward Medium0.8593
Triple Number Windward/Leeward High0.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
For information
General Purpose Handicap (GPH)633.8
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low716.6
Triple Number Coastal/Long Distance Medium563.4
Triple Number Coastal/Long Distance High511.0
Triple Number Windward/Leeward Low923.5
Triple Number Windward/Leeward Medium698.2
Triple Number Windward/Leeward High617.4
Predominantly Upwind611.8
Predominantly Downwind577.1
Predominantly Reaching551.2
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8373
Triple Number Coastal/Long Distance Medium1.0650
Triple Number Coastal/Long Distance High1.1742
Triple Number Windward/Leeward Low0.6497
Triple Number Windward/Leeward Medium0.8593
Triple Number Windward/Leeward High0.9718
Coastal/Long Distance0.9710
Predominantly Upwind0.9807
Predominantly Downwind1.0396
For information
General Purpose Handicap (GPH)633.8
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)1.0579
Distanseseilas Trippeltall svak vind0.8373
Distanseseilas Trippeltall mellomvind1.0650
Distanseseilas Trippeltall sterk vind1.1742
Pølsebane Trippeltall svak vind0.6497
Pølsebane Trippeltall mellomvind0.8593
Pølsebane Trippeltall sterk vind0.9718
Motvind Singeltall0.9807
Medvind Singeltall1.0396
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Coastal/Long Distance617.90.9710
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind611.80.9807
Predominantly Downwind577.11.0396
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore586.81.0225
Cape Doctor Coastal488.91.2271
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8373
Triple Number Coastal/Long Distance Medium1.0650
Triple Number Coastal/Long Distance High1.1742
Triple Number Windward/Leeward Low0.6497
Triple Number Windward/Leeward Medium0.8593
Triple Number Windward/Leeward High0.9718
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8373
Triple Number Coastal/Long Distance Medium1.0650
Triple Number Coastal/Long Distance High1.1742
Triple Number Windward/Leeward Low0.6497
Triple Number Windward/Leeward Medium0.8593
Triple Number Windward/Leeward High0.9718
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Predominantly Upwind611.80.9807
Predominantly Downwind577.11.0396
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance617.90.9710
Triple Number Coastal/Long Distance Low716.60.8373
Triple Number Coastal/Long Distance Medium563.41.0650
Triple Number Coastal/Long Distance High511.01.1742
Triple Number Windward/Leeward Low923.50.6497
Triple Number Windward/Leeward Medium698.20.8593
Triple Number Windward/Leeward High617.40.9718
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1513.81018.7779.1657.2586.4548.8519.7473.6462.4
Custom scoring options for United States of America
Scoring OptionTODTOT
TriNum AP Low716.60.8373
TriNum AP Med563.41.0649
TriNum AP High511.01.1742
TriNum W/L Low963.80.6226
TriNum W/L Med698.20.8593
TriNum W/L Hig617.40.9718
Predom. Upwind634.70.9454
Predom. Reaching561.71.0681
Predom. Downwind602.30.9962
Predom. Up Low852.30.7040
Predom. Up L/M663.80.9039
Predom. Up Med594.11.0100
Predom. Up M/H560.81.0699
Predom. Up High547.01.0969
Predom. Dn Low868.60.6908
Predom. Dn L/M648.50.9252
Predom. Dn Med557.61.0761
Predom. Dn M/H504.11.1901
Predom. Dn High473.71.2666
Predom. Rc Low764.90.7845
Predom. Rc L/M592.91.0120
Predom. Rc Med526.21.1402
Predom. Rc M/H489.71.2253
Predom. Rc High469.51.2780
SA/DSPL Upwind21.36SA/DSPL Downwind35.51
Scoring OptionTODTOT
5B W/L Low1072.80.5593
5B W/L L/M798.70.7512
5B W/L Med687.40.8728
5B W/L M/H625.90.9586
5B W/L High597.51.0042
W/L 60-40 Low1073.10.5591
W/L 60-40 L/M806.30.7442
W/L 60-40 Med700.50.8565
W/L 60-40 M/H644.50.9310
W/L 60-40 High620.30.9672
5B AP Low789.30.7602
5B AP L/M630.90.9510
5B AP Med556.41.0784
5B AP M/H516.51.1617
5B AP High497.51.2061
5B SF Bay Low925.70.6482
5B SF Bay L/M762.70.7866
5B SF Bay Med662.10.9062
5B SF Bay M/H608.70.9857
5B SF Bay High584.51.0265
Chicago-Mac Upwind0.9187
Chicago-Mac All Purpose0.9435
Chicago-Mac Downwind0.9621
BayMac Cove Island858.00.6993
BayMac Shore851.00.7050
Harvest Moon494.21.2141
ORC Ref  03510003SV5Issued on 29/05/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
ISLA SIRENA IIESP-5443_C
RFEV
c/ Gamazo sn
39004 Santander – España
crucero@rfev.es
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassDUFOUR 41 CLMeasurementHINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA11.950Max. Beam3.976Draft2.026Displacement9,350Wetted area32.09IMS L10.443LSM010.513Acc. length11.950Sink (kg/mm) 24.59
VCGD0.275VCGM0.233RM Rated (kg·m) 190.0Limit of positive stability(°) N/AStability IndexN/ADefault crew weight739Declared crew weight350
PROPELLER
Propeller TypeSolid 2 blades
InstallationStrutTwin screwNoHydro generatorNo
PRD0.300PBWPIPA0.0101
EDL3.000ST10.070ST20.170
ST30.190ST40.096ST50.320
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerYesMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0Checkstays0Spreaders2Rotating mastNo
P14.300IG15.800ISP15.900MDT10.100MDL10.110MDT2MDL2TLMWGO
E4.700J4.400BAS1.800FSD0.040SFJSPL5.000WPLTPS4.500BDMWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM entered directlyRM entered190.0Flotation Date01/08/2020
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  03510003SV5Issued on 29/05/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
ISLA SIRENA IIESP-5443_C
RFEV
c/ Gamazo sn
39004 Santander – España
crucero@rfev.es
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment00141.25
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment0016.50NoNo 54.26
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateComment00215.68NaN117.55
CRUISER/RACER REQUIREMENTS*
Accommodation length11.9 mTable area0.55 m²Headroom1.81 mMinimum number of berths5Personal gear stowage0.20 m³Fresh water capacity148 lMinimum number of seats in cockpit5Food stowage0.30 m³Fuel capacity88 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.
ORC Ref  03510003SV5Issued on 29/05/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org