Club Certificate2025
IMPETUOUSIRL 2507
ORC
Central Rating Office
Issuing certificates for
Ireland
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 Angles41.3°41.3°39.3°37.4°36.7°36.5°36.3°36.5°38.0°
Beat VMG2.473.374.034.374.504.564.604.634.54
52°3.835.045.776.076.196.266.306.346.33
60°4.065.265.916.196.336.406.456.526.51
75°4.175.376.006.296.486.616.706.826.88
90°4.025.255.976.316.546.746.907.137.29
110°3.965.266.096.466.736.947.107.387.59
120°3.795.105.986.426.767.077.357.748.07
135°3.314.615.626.206.576.927.308.139.18
150°2.763.944.975.796.276.616.947.688.72
Run VMG2.393.414.315.075.686.126.467.077.77
Gybe Angles146.6°146.6°151.0°156.1°164.8°173.6°177.7°177.2°170.3°
APH ToD:621.4CDL: 7.000APH ToT: 0.9655CertNo:
BOAT
ClassCORBY 25DesignerCORBY JohnBuilderLION YACHTAge date08/2007Series date01/2000Offset fileCorby25-SWE25001.offData fileIRL2507
HULL
Length Overall7.710 mMaximum Beam2.468 mDraft1.819 mDisplacement2,360 kgDLR8.2418IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.487%
PROPELLER
InstallationIn ApertureTypeFolding 2 bladesDiameterm
CREW
Maximum weight510 kg(declared)Minimum weight380 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail20.8021.26Headsail Luffed20.4520.45Headsail FlyingSymmetric53.6253.62Asymmetric
STORM SAIL AREAS (m²)
Trysail6.12Storm Jib5.61Heavy Weather Jib15.14
SAIL LIMITS
Headsails5Spinnakers4
STABILITY
Righting 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.
ORC Ref  038800040UKIssued on 20/09/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
IMPETUOUSIRL 2507
ORC
Central Rating Office
Issuing certificates for
Ireland
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 VMG1458.51067.6893.2823.9800.6789.2781.8777.5793.5
52°939.3714.0623.6593.2581.3575.5571.6567.5568.4
60°886.5685.0608.7581.9568.8562.5558.0552.6552.7
75°863.1670.9599.6572.2555.6544.4537.6527.7522.9
90°895.2685.8603.1571.0550.4534.4521.8504.9493.8
110°909.1684.5591.4557.3534.7518.4506.9488.0474.0
120°949.1706.2602.1560.7532.5509.3489.5465.3446.1
135°1089.0781.2640.1580.4548.1520.1493.4443.0392.3
150°1305.1914.5723.9621.6574.0544.8518.7468.5412.8
Run VMG1506.81055.9835.5709.9633.7587.9557.5509.1463.3
Selected Courses
Windward / Leeward1481.81061.8864.3766.9717.1688.6669.6643.3628.4
All purpose1125.2827.3694.2635.1605.3586.5572.2550.4534.9
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward744.90.8055
All purpose621.40.9655
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7078
Downwind "popa"0.8590
70% up, 30% down "Ilhabela"0.7473
30% up, 70% down "Ilhabela-inverso"0.8073
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Predominantly Upwind668.30.8978
Predominantly Downwind624.70.9605
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low760.70.7887
Triple Number AP Medium618.00.9709
Triple Number AP High567.61.0571
Triple Number Windward/Leeward Low1005.30.5968
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Single Number Predominant Upwind692.10.8669
Single Number Predominant Reaching619.20.9690
Single Number Predominant Downwind650.20.9228
Predominant Upwind - Low900.40.6664
Predominant Upwind - Low/Med714.40.8398
Predominant Upwind - Medium653.20.9185
Predominant Upwind - Med/High623.20.9628
Predominant Upwind - High608.50.9860
Predominant Downwind Low915.70.6552
Predominant Downwind Low/Med695.10.8632
Predominant Downwind Medium607.40.9879
Predominant Downwind Med/High551.61.0877
Predominant Downwind High514.51.1661
Predominant Reaching Low816.50.7349
Predominant Reaching Low/Med647.50.9267
Predominant Reaching Medium586.61.0228
Predominant Reaching Med/High547.81.0952
Predominant Reaching High521.81.1499
SA/DSPL Upwind23.21SA/DSPL Downwind41.86
Scoring OptionTODTOT
5-Band Windward/Leeward Low1117.70.5368
5-Band Windward/Leeward Low/Med837.30.7166
5-Band Windward/Leeward Medium728.90.8232
5-Band Windward/Leeward Med/High672.40.8924
5-Band Windward/Leeward High645.30.9298
Windward/Leeward 60-40 Low1118.50.5364
Windward/Leeward 60-40 Low/Med846.00.7092
Windward/Leeward 60-40 Medium744.80.8056
Windward/Leeward 60-40 Med/High694.70.8637
Windward/Leeward 60-40 High672.40.8923
5-Band AP Low836.40.7174
5-Band AP Low/Med679.80.8826
5-Band AP Medium611.70.9809
5-Band AP Med/High573.71.0458
5-Band AP High551.51.0880
5-Band SF Bay Tour - Low966.80.6206
5-Band SF Bay Tour - Low/Med804.00.7463
5-Band SF Bay Tour - Medium709.10.8462
5-Band SF Bay Tour - Med/High659.80.9094
5-Band SF Bay Tour - High634.10.9462
Chicago-Mac Upwind0.8467
Chicago-Mac All Purpose0.8722
Chicago-Mac Downwind0.8941
Bayview-Mac Cove Island0.6608
Bayview-Mac Shore0.6654
Harvest Moon Regatta550.91.0891
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance669.8
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating669.80.8958
FinRating, kevyt tuuli1099.70.9093
FinRating, kova tuuli555.70.8998
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.8958
Triple Number Coastal/Long Distance Low0.7887
Triple Number Coastal/Long Distance Medium0.9710
Triple Number Coastal/Long Distance High1.0571
Triple Number Windward/Leeward Low0.6230
Triple Number Windward/Leeward Medium0.8121
Triple Number Windward/Leeward High0.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
For information
General Purpose Handicap (GPH)688.9
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low760.7
Triple Number Coastal/Long Distance Medium617.9
Triple Number Coastal/Long Distance High567.6
Triple Number Windward/Leeward Low963.1
Triple Number Windward/Leeward Medium738.8
Triple Number Windward/Leeward High664.5
Predominantly Upwind668.3
Predominantly Downwind624.7
Predominantly Reaching605.5
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7887
Triple Number Coastal/Long Distance Medium0.9710
Triple Number Coastal/Long Distance High1.0571
Triple Number Windward/Leeward Low0.6230
Triple Number Windward/Leeward Medium0.8121
Triple Number Windward/Leeward High0.9029
Coastal/Long Distance0.8958
Predominantly Upwind0.8978
Predominantly Downwind0.9605
For information
General Purpose Handicap (GPH)688.9
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.9655
Distanseseilas Trippeltall svak vind0.7887
Distanseseilas Trippeltall mellomvind0.9710
Distanseseilas Trippeltall sterk vind1.0571
Pølsebane Trippeltall svak vind0.6230
Pølsebane Trippeltall mellomvind0.8121
Pølsebane Trippeltall sterk vind0.9029
Motvind Singeltall0.8978
Medvind Singeltall0.9605
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Coastal/Long Distance669.80.8958
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind668.30.8978
Predominantly Downwind624.70.9605
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore632.90.9480
Cape Doctor Coastal539.51.1120
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7887
Triple Number Coastal/Long Distance Medium0.9710
Triple Number Coastal/Long Distance High1.0571
Triple Number Windward/Leeward Low0.6230
Triple Number Windward/Leeward Medium0.8121
Triple Number Windward/Leeward High0.9029
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7887
Triple Number Coastal/Long Distance Medium0.9710
Triple Number Coastal/Long Distance High1.0571
Triple Number Windward/Leeward Low0.6230
Triple Number Windward/Leeward Medium0.8121
Triple Number Windward/Leeward High0.9029
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Predominantly Upwind668.30.8978
Predominantly Downwind624.70.9605
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance669.80.8958
Triple Number Coastal/Long Distance Low760.70.7887
Triple Number Coastal/Long Distance Medium617.90.9710
Triple Number Coastal/Long Distance High567.61.0571
Triple Number Windward/Leeward Low963.10.6230
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1567.91061.2818.4702.8641.6606.9577.7531.0515.4
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low760.70.7887
Triple Number AP Medium618.00.9709
Triple Number AP High567.61.0571
Triple Number Windward/Leeward Low1005.30.5968
Triple Number Windward/Leeward Medium738.80.8121
Triple Number Windward/Leeward High664.50.9029
Single Number Predominant Upwind692.10.8669
Single Number Predominant Reaching619.20.9690
Single Number Predominant Downwind650.20.9228
Predominant Upwind - Low900.40.6664
Predominant Upwind - Low/Med714.40.8398
Predominant Upwind - Medium653.20.9185
Predominant Upwind - Med/High623.20.9628
Predominant Upwind - High608.50.9860
Predominant Downwind Low915.70.6552
Predominant Downwind Low/Med695.10.8632
Predominant Downwind Medium607.40.9879
Predominant Downwind Med/High551.61.0877
Predominant Downwind High514.51.1661
Predominant Reaching Low816.50.7349
Predominant Reaching Low/Med647.50.9267
Predominant Reaching Medium586.61.0228
Predominant Reaching Med/High547.81.0952
Predominant Reaching High521.81.1499
SA/DSPL Upwind23.21SA/DSPL Downwind41.86
Scoring OptionTODTOT
5-Band Windward/Leeward Low1117.70.5368
5-Band Windward/Leeward Low/Med837.30.7166
5-Band Windward/Leeward Medium728.90.8232
5-Band Windward/Leeward Med/High672.40.8924
5-Band Windward/Leeward High645.30.9298
Windward/Leeward 60-40 Low1118.50.5364
Windward/Leeward 60-40 Low/Med846.00.7092
Windward/Leeward 60-40 Medium744.80.8056
Windward/Leeward 60-40 Med/High694.70.8637
Windward/Leeward 60-40 High672.40.8923
5-Band AP Low836.40.7174
5-Band AP Low/Med679.80.8826
5-Band AP Medium611.70.9809
5-Band AP Med/High573.71.0458
5-Band AP High551.51.0880
5-Band SF Bay Tour - Low966.80.6206
5-Band SF Bay Tour - Low/Med804.00.7463
5-Band SF Bay Tour - Medium709.10.8462
5-Band SF Bay Tour - Med/High659.80.9094
5-Band SF Bay Tour - High634.10.9462
Chicago-Mac Upwind0.8467
Chicago-Mac All Purpose0.8722
Chicago-Mac Downwind0.8941
Bayview-Mac Cove Island0.6608
Bayview-Mac Shore0.6654
Harvest Moon Regatta550.91.0891
ORC Ref  038800040UKIssued on 20/09/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
IMPETUOUSIRL 2507
ORC
Central Rating Office
Issuing certificates for
Ireland
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassCORBY 25MeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA7.710Max. Beam2.468Draft1.819Displacement2,360Wetted area13.48IMS L7.042LSM06.591Acc. length7.710Sink (kg/mm) 9.04
VCGD-0.123VCGM-0.070RM Rated (kg·m) 25.2Limit of positive stability(°) N/AStability IndexN/ADefault crew weight380Declared crew weight510
PROPELLER
Propeller TypeFolding 2 blades
InstallationIn ApertureTwin screwNoHydro generatorNo
PRDPBW
APHAPTAPB
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders2Rotating mastNo
P9.700IG10.590ISP10.850MDT10.095MDL10.138MDT20.095MDL20.138TL0.000MW0.138GO0.138
E3.600J2.900BAS1.320FSD0.034SFJ0.050SPL3.200WPLTPSBD0.120MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered-0.123Flotation Date31/01/2013
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  038800040UKIssued on 20/09/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
IMPETUOUSIRL 2507
ORC
Central Rating Office
Issuing certificates for
Ireland
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentM10.751.332.3020.8021/01/2024
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment00.500.941.903.9710.40NoNo 20.45
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment010.8010.8010.806.025.7153.62
ORC Ref  038800040UKIssued on 20/09/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org