Club Certificate2026
BIG BROTHERIRL-1984
Centre de Calcul FFVoile
17 rue Henri Bocquillon
75015 Paris
France
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 Angles45.4°42.9°41.4°40.2°39.6°39.2°39.5°40.8°42.4°
Beat VMG1.972.793.353.713.964.114.174.154.07
52°3.084.234.965.395.665.855.976.016.01
60°3.294.445.155.555.826.036.196.306.32
75°3.444.575.285.695.996.256.496.776.87
90°3.414.675.485.956.306.526.667.107.43
110°3.444.715.516.006.446.837.207.768.23
120°3.304.555.395.906.356.777.188.239.33
135°2.894.125.025.646.086.516.927.959.93
150°2.433.564.505.245.756.156.557.368.58
Run VMG2.103.083.914.605.185.646.016.737.52
Gybe Angles143.9°148.4°152.5°158.3°164.8°171.8°176.3°177.2°163.6°
APH ToD:682.9CDL: 5.529APH ToT: 0.8786CertNo:26116a
BOAT
ClassPROTO 1/4 TON 1981DesignerRon HollandBuilderAge date06/1984Series date06/1984Offset fileIRL1984.OFFData fileIRL1984_26116a
HULL
Length Overall6.890Maximum Beam2.870Draft1.479Displacement1,095DLR8.0525IMS DivisionPerformanceDynamic Allowance0.190%Age Allowance0.650%RS Assessment-0.127%
PROPELLER
InstallationNo PropellerTypeN/ADiameterN/A
CREW
Maximum weight267(default)Minimum weight137 ✱ when appliedCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail14.5114.81Headsail Luffed11.7211.72Headsail FlyingSymmetric32.9132.91Asymmetric
STORM SAIL AREAS Maximum (m²)
Trysail4.29Storm Jib3.50Heavy Weather Jib9.44
SAIL LIMITS
Headsails5Spinnakers4
STABILITY
Righting Moment 29.3 Stability Index 94.4
COMMENTS
2026: P,New Sails & Sail Meas. / 2025: P,E,SPL,Sails,DSPL / 2024: First cert. after complete refit / From: Scratch /
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  04330004HLN Issued on 13/03/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org
Club Certificate2026
BIG BROTHERIRL-1984
Centre de Calcul FFVoile
17 rue Henri Bocquillon
75015 Paris
France
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 VMG1823.11290.01075.2970.7909.8875.5863.3866.5883.8
52°1168.5851.9725.7668.2635.9615.4603.2598.6598.5
60°1092.7811.7699.0648.2618.5596.9581.4571.4569.3
75°1045.2787.6682.2632.4601.5575.6554.9532.1523.8
90°1055.5770.9657.4605.5571.8551.9540.5507.0484.7
110°1046.1764.6653.1600.2559.1527.3500.1464.1437.4
120°1091.0791.8668.3609.9567.2532.1501.3437.4386.0
135°1243.6874.6716.8637.9592.5552.8520.5453.0362.4
150°1484.31012.5800.1687.6626.3585.7549.4489.4419.5
Run VMG1713.91169.1921.4782.0694.4638.5599.0534.8478.7
Selected Courses
Windward / Leeward1768.51229.5998.3876.4802.1757.0731.2700.7681.3
All purpose1342.2954.3792.2711.0661.7628.9606.7575.7550.2
Single Number Scoring Options
Course Time On
Distance 		Time On
Time
Windward / Leeward836.80.7170
All purpose682.90.8786
Custom scoring options for Australia
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Custom scoring options for Austria
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Brazil
Scoring Option Time On
Time
Upwind "bolina"0.6130
Downwind "popa"0.7866
70% up, 30% down "Ilhabela"0.6565
30% up, 70% down "Ilhabela-inverso"0.7250
Custom scoring options for Bulgaria
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Predominantly Upwind745.90.8044
Predominantly Downwind684.90.8760
Custom scoring options for Canada
Scoring OptionTODTOT Scoring OptionTODTOT Scoring OptionTODTOT Single Number AP707.50.8481 Predom. Rc High539.41.1123 5B SF Bay L/M921.00.6515 TriNum AP Low873.30.6871 Predom. Dn Low1043.80.5748 5B SF Bay Med794.10.7556 TriNum AP Med680.90.8812 Predom. Dn L/M774.30.7749 5B SF Bay M/H719.90.8335 TriNum AP High600.60.9989 Predom. Dn Med662.00.9064 5B SF Bay High686.90.8734 TriNum W/L Low1167.20.5140 Predom. Dn M/H587.21.0219 5B AP Low965.30.6216 TriNum W/L Med831.90.7212 Predom. Dn High536.01.1194 5B AP L/M768.20.7810 TriNum W/L Hig726.20.8262 ChiMac Up Low940.50.6379 5B AP Med670.70.8946 Predom. Upwind776.10.7731 ChiMac Up Med849.40.7064 5B AP M/H609.90.9838 Predom. Reaching676.00.8876 ChiMac Up High742.70.8078 5B AP High576.71.0405 Predom. Downwind713.40.8410 ChiMac Off Low899.00.6674 5B W/L Low1306.50.4592 Predom. Up Low1067.60.5620 ChiMac Off Med794.50.7552 5B W/L L/M960.40.6247 Predom. Up L/M819.10.7325 ChiMac Off High668.40.8976 5B W/L Med817.40.7341 Predom. Up Med723.60.8292 ChiMac AP Low915.10.6557 5B W/L M/H736.30.8149 Predom. Up M/H671.20.8939 ChiMac AP Med818.40.7331 5B W/L High702.60.8540 Predom. Up High650.50.9224 ChiMac AP High703.20.8533 W/L 60-40 Low1319.10.4549 Predom. Rc Low939.80.6384 BayMac Cove Island1050.00.5714 W/L 60-40 L/M977.50.6138 Predom. Rc L/M720.30.8330 BayMac Shore1042.00.5758 W/L 60-40 Med838.70.7154 Predom. Rc Med633.70.9469 Harvest Moon591.51.0143 W/L 60-40 M/H763.00.7864 Predom. Rc M/H577.81.0384 5B SF Bay Low1107.90.5416 W/L 60-40 High735.90.8154      SA/DSPL Up24.69SA/DSPL Dn44.63
Custom scoring options for Cyprus
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Denmark
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Spain
Scoring Option Time On
Distance
Coastal/Long Distance741.2
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Estonia
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Custom scoring options for Finland
Scoring Option Time On
Distance 		Time On
Time
FinRating741.20.8095
FinRating, kevyt tuuli1286.50.7773
FinRating, kova tuuli576.60.8671
Custom scoring options for France
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Custom scoring options for Germany
Scoring Option Time On
Time
Coastal/Long Distance0.8095
Triple Number Coastal/Long Distance Low0.6871
Triple Number Coastal/Long Distance Medium0.8813
Triple Number Coastal/Long Distance High0.9989
Triple Number Windward/Leeward Low0.5386
Triple Number Windward/Leeward Medium0.7212
Triple Number Windward/Leeward High0.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
For information
General Purpose Handicap (GPH)765.7
Custom scoring options for Greece
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Saronikos S All Purpose782.40.7669
Saronikos S Upwind892.30.6724
Saronikos S Downwind645.10.9300
Saronikos N All Purpose821.20.7307
Saronikos N Upwind928.00.6466
Saronikos N Downwind710.30.8447
Saronikos SW All Purpose785.60.7637
Saronikos SW Upwind914.00.6564
Saronikos SW Downwind655.10.9159
Saronikos NE All Purpose846.00.7092
Saronikos NE Upwind868.80.6906
Saronikos NE Downwind794.50.7552
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Hungary
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Custom scoring options for Ireland
Scoring OptionTODTOT
Single Number All-Purpose707.50.8481
5-Band All Purpose Low1050.70.5710
5-Band All Purpose L/M793.70.7559
5-Band All Purpose Med690.70.8687
5-Band All Purpose M/H627.90.9555
5-Band All Purpose High592.51.0127
Single Number Predominant Upwind744.70.8057
Single Number Predominant Reaching651.90.9204
Single Number Predominant Downwind685.70.8750
5-Band 50-50 Windward/Leeward Low1306.50.4592
5-Band 50-50 Windward/Leeward L/M960.40.6247
5-Band 50-50 Windward/Leeward Med817.40.7341
5-Band 50-50 Windward/Leeward M/H736.30.8149
5-Band 50-50 Windward/Leeward High702.60.8540
5-Band 60-40 Windward/Leeward Low1319.10.4549
5-Band 60-40 Windward/Leeward L/M977.50.6138
5-Band 60-40 Windward/Leeward Med838.70.7154
5-Band 60-40 Windward/Leeward M/H763.00.7864
5-Band 60-40 Windward/Leeward High735.90.8154
Triple Number 50-50 Windward/Leeward Low1167.20.5140
Triple Number 50-50 Windward/Leeward Med832.00.7211
Triple Number 50-50 Windward/Leeward High726.20.8262
Scoring OptionTODTOT
Single Number 60-40 Windward/Leeward858.20.6991
Triple Number 60-40 Windward/Leeward Low1181.00.5080
Triple Number 60-40 Windward/Leeward Med852.70.7036
Triple Number 60-40 Windward/Leeward High754.50.7953
Triple Number All-Purpose Low946.20.6341
Triple Number All-Purpose Med701.30.8555
Triple Number All-Purpose High618.20.9706
Triple Number Predominant Upwind Low973.50.6163
Triple Number Predominant Upwind Med736.60.8146
Triple Number Predominant Upwind High672.80.8918
Triple Number Predominant Reaching Low855.80.7011
Triple Number Predominant Reaching Med654.20.9172
Triple Number Predominant Reaching High556.81.0776
Triple Number Predominant Downwind Low934.80.6418
Triple Number Predominant Downwind Med672.70.8920
Triple Number Predominant Downwind High561.01.0695
Custom scoring options for Israel
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Japan
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Korea
Scoring Option Time On
Distance
Triple Number Coastal/Long Distance Low873.2
Triple Number Coastal/Long Distance Medium680.8
Triple Number Coastal/Long Distance High600.7
Triple Number Windward/Leeward Low1114.0
Triple Number Windward/Leeward Medium831.9
Triple Number Windward/Leeward High726.2
Predominantly Upwind745.9
Predominantly Downwind684.9
Predominantly Reaching660.0
Custom scoring options for Lithuania
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Netherlands
Scoring Option Time On
Time
Triple Number Coastal/Long Distance Low0.6871
Triple Number Coastal/Long Distance Medium0.8813
Triple Number Coastal/Long Distance High0.9989
Triple Number Windward/Leeward Low0.5386
Triple Number Windward/Leeward Medium0.7212
Triple Number Windward/Leeward High0.8262
Coastal/Long Distance0.8095
Predominantly Upwind0.8044
Predominantly Downwind0.8760
For information
General Purpose Handicap (GPH)765.7
Custom scoring options for Norway
Scoring Option Time On
Time
Distanseseilas Singeltall  (APH)0.8786
Distanseseilas Trippeltall svak vind0.6871
Distanseseilas Trippeltall mellomvind0.8813
Distanseseilas Trippeltall sterk vind0.9989
Pølsebane Trippeltall svak vind0.5386
Pølsebane Trippeltall mellomvind0.7212
Pølsebane Trippeltall sterk vind0.8262
Motvind Singeltall0.8044
Medvind Singeltall0.8760
Custom scoring options for Portugal
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Coastal/Long Distance741.20.8095
Custom scoring options for Russia
Scoring Option Time On
Distance 		Time On
Time
Predominantly Upwind745.90.8044
Predominantly Downwind684.90.8760
Custom scoring options for South Africa
Scoring Option Time On
Distance 		Time On
Time
Cape Doctor Inshore687.10.8733
Cape Doctor Coastal557.91.0755
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Custom scoring options for Slovenia
Scoring Option Time On
Time
Triple Number Coastal/Long Distance Low0.6871
Triple Number Coastal/Long Distance Medium0.8813
Triple Number Coastal/Long Distance High0.9989
Triple Number Windward/Leeward Low0.5386
Triple Number Windward/Leeward Medium0.7212
Triple Number Windward/Leeward High0.8262
Custom scoring options for Switzerland
Scoring Option Time On
Time
Triple Number Coastal/Long Distance Low0.6871
Triple Number Coastal/Long Distance Medium0.8813
Triple Number Coastal/Long Distance High0.9989
Triple Number Windward/Leeward Low0.5386
Triple Number Windward/Leeward Medium0.7212
Triple Number Windward/Leeward High0.8262
Custom scoring options for Sweden
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Predominantly Upwind745.90.8044
Predominantly Downwind684.90.8760
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for Ukraine
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance741.20.8095
Triple Number Coastal/Long Distance Low873.20.6871
Triple Number Coastal/Long Distance Medium680.80.8813
Triple Number Coastal/Long Distance High600.70.9989
Triple Number Windward/Leeward Low1114.00.5386
Triple Number Windward/Leeward Medium831.90.7212
Triple Number Windward/Leeward High726.20.8262
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1763.11223.5939.9794.8706.1653.1612.6542.7514.0
Custom scoring options for United States of America
Scoring OptionTODTOT Scoring OptionTODTOT Scoring OptionTODTOT Single Number AP707.50.8481 Predom. Dn High536.01.1194 5B AP M/H609.90.9838 TriNum AP Low873.30.6871 Predom. Rc Low939.80.6384 5B AP High576.71.0405 TriNum AP Med680.90.8812 Predom. Rc L/M720.30.8330 5B SF Bay Low1107.90.5416 TriNum AP High600.60.9989 Predom. Rc Med633.70.9469 5B SF Bay L/M921.00.6515 TriNum W/L Low1167.20.5140 Predom. Rc M/H577.81.0384 5B SF Bay Med794.10.7556 TriNum W/L Med831.90.7212 Predom. Rc High539.41.1123 5B SF Bay M/H719.90.8335 TriNum W/L Hig726.20.8262 5B W/L Low1306.50.4592 5B SF Bay High686.90.8734 Predom. Upwind776.10.7731 5B W/L L/M960.40.6247 ChiMac Up Low940.50.6379 Predom. Reaching676.00.8876 5B W/L Med817.40.7341 ChiMac Up Med849.40.7064 Predom. Downwind713.40.8410 5B W/L M/H736.30.8149 ChiMac Up High742.70.8078 Predom. Up Low1067.60.5620 5B W/L High702.60.8540 ChiMac Off Low899.00.6674 Predom. Up L/M819.10.7325 W/L 60-40 Low1319.10.4549 ChiMac Off Med794.50.7552 Predom. Up Med723.60.8292 W/L 60-40 L/M977.50.6138 ChiMac Off High668.40.8976 Predom. Up M/H671.20.8939 W/L 60-40 Med838.70.7154 ChiMac AP Low915.10.6557 Predom. Up High650.50.9224 W/L 60-40 M/H763.00.7864 ChiMac AP Med818.40.7331 Predom. Dn Low1043.80.5748 W/L 60-40 High735.90.8154 ChiMac AP High703.20.8533 Predom. Dn L/M774.30.7749 5B AP Low965.30.6216 BayMac Cove Island1050.00.5714 Predom. Dn Med662.00.9064 5B AP L/M768.20.7810 BayMac Shore1042.00.5758 Predom. Dn M/H587.21.0219 5B AP Med670.70.8946 Harvest Moon591.51.0143      SA/DSPL Up24.69SA/DSPL Dn44.63
ORC Ref  04330004HLN Issued on 13/03/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org
Club Certificate2026
BIG BROTHERIRL-1984
Centre de Calcul FFVoile
17 rue Henri Bocquillon
75015 Paris
France
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassPROTO 1/4 TON 1981MeasurementHIN1498Plan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
Length overall6.890Maximum beam2.870Draft1.479Displacement1,095Wetted area10.35IMS L5.671LSM05.142Accomod. length6.890Sink (kg/mm) 7.93
VCGD0.017VCGM0.131 RM Rated (kg·m) 29.3Limit of positive stability(°) 103.0 Stability Index 94.4 BLR index 0.0000Default crew weight267 Declared crew weight
Centerboard weightList angleCanting keel angle
PROPELLER
Propeller TypeNo Propeller
Hydro generatorNo
RIG
BackstayAdjustableForestayFixedInner forestayNot installedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoBase of mastFixedRunning backstaysNoCheckstaysNoSpreaders1Rotating mastNo
P8.170IG8.360ISP8.670MDT10.080MDL10.120MDT20.058MDL20.072TL3.013MW0.090GO0.090
E3.000J2.500BAS1.050FSDSFJ0.130SPL2.600WPLTPSBD0.100MWTMCG
PYMDT1YMDL1YMDT2YMDL2YTLYBASYEYBDYIYEB
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered0.017Flotation Date01/01/2013
SFFP0.345FFM0.910FF0.910LCFcl3.624SG1.0255
SAFP6.100FAM0.722FA0.722LCFsh3.874HBI0.829
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  04330004HLN Issued on 13/03/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org
Club Certificate2026
BIG BROTHERIRL-1984
Centre de Calcul FFVoile
17 rue Henri Bocquillon
75015 Paris
France
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentM20.180.601.081.902.5514.5104/06/2025Medium - Modified from M1 - Update 2026
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentG20.150.450.801.462.112.668.20YesNo 11.7204/06/2025Light - New 2025 - Update 2026G40.130.410.711.331.932.458.20YesNo 10.7017/02/2026Heavy - Update from G3
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateCommentS58.328.328.324.804.5332.9117/02/2026Medium - New 2026S48.048.048.044.964.6032.7517/02/2026Heavy - New 2026
NON MANUAL POWER CONTROLS (NMP)
SheetsNoMainsail cunninghamNoJib trackNoSpinnaker retrieverNoBoomvangNoHeadsail cunninghamNoTack lineNoOuthaulNoMain travellerNoHalyardsNo
ORC Ref  04330004HLN Issued on 13/03/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org