Non Spin/HSFClub Certificate2025
ThunderchildRSA-1027
ORC
Central Rating Office
Issuing certificates for
SOUTH AFRICA
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 Angles42.3°42.3°39.9°37.9°37.0°36.9°36.4°36.1°36.9°
Beat VMG3.204.445.395.886.136.286.406.536.48
52°4.986.717.878.378.598.738.838.978.99
60°5.307.048.148.618.838.979.089.249.30
75°5.557.278.318.839.139.329.479.709.82
90°5.387.118.228.839.249.579.8310.1910.45
110°4.656.317.548.428.989.469.9310.7611.31
120°4.075.717.088.118.769.279.7610.8212.02
135°3.354.846.197.318.188.779.2610.2811.52
150°2.724.015.246.327.268.048.619.4810.41
Run VMG2.353.474.535.486.377.258.019.0810.01
Gybe Angles140.8°140.8°145.8°147.6°173.0°174.8°177.2°178.9°178.9°
APH ToD:480.7CDL: 13.187APH ToT: 1.2483CertNo:ZAN176
BOAT
ClassLavranos 52DesignerLavranosBuilderOwnerAge date01/1988Series date01/1988Offset file1052L.OFFData fileRSA1027
HULL
Length Overall15.740 mMaximum Beam4.748 mDraft3.149 mDisplacement10,950 kgDLR4.9242IMS DivisionPerformanceDynamic Allowance0.100%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeFolding 3 bladesDiameter0.450m
CREW
Maximum weight1,006 kg(default)Minimum weight855 kg ✱ when appliedNon Manual PowerYesCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail93.2494.81Headsail Luffed62.5562.55Headsail FlyingSymmetricAsymmetric
STORM SAIL AREAS (m²)
Trysail27.90Storm Jib20.06Heavy Weather Jib54.15
SAIL LIMITS
Headsails7
✱ Zero set flying
Spinnakers0
✱ No spinnaker pole aboard
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.
Non Spin/HSFClub Certificate2025
ThunderchildRSA-1027
ORC
Central Rating Office
Issuing certificates for
SOUTH AFRICA
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 VMG1123.3810.1668.3612.2587.4572.9562.4550.9555.4
52°722.7536.6457.2430.1419.1412.5407.8401.4400.4
60°678.7511.3442.0417.9407.9401.4396.5389.7387.1
75°649.1495.3433.1407.7394.3386.2380.0371.1366.6
90°669.1506.0437.8407.9389.4376.0366.2353.4344.6
110°773.5570.3477.3427.8400.7380.4362.7334.5318.3
120°884.8630.4508.5444.1410.7388.3368.7332.7299.4
135°1074.6743.1581.2492.4440.1410.3388.6350.3312.4
150°1324.1898.0687.6569.3496.0447.6418.2379.7346.0
Run VMG1530.61036.9794.0657.4565.0496.7449.3396.6359.8
Selected Courses
Windward / Leeward1325.4923.5731.2634.8576.2534.8505.9473.7457.6
All purpose970.3693.3563.4500.1464.2440.2423.1400.3385.8
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward600.40.9994
All purpose480.71.2483
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.9623
Downwind "popa"0.9554
70% up, 30% down "Ilhabela"0.9603
30% up, 70% down "Ilhabela-inverso"0.9575
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Predominantly Upwind503.71.1913
Predominantly Downwind511.41.1732
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low628.40.9549
Triple Number AP Medium478.51.2539
Triple Number AP High418.81.4325
Triple Number Windward/Leeward Low867.70.6915
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Single Number Predominant Upwind523.01.1472
Single Number Predominant Reaching478.61.2536
Single Number Predominant Downwind537.81.1156
Predominant Upwind - Low718.30.8353
Predominant Upwind - Low/Med549.81.0913
Predominant Upwind - Medium488.21.2289
Predominant Upwind - Med/High454.21.3210
Predominant Upwind - High437.61.3712
Predominant Downwind Low828.60.7241
Predominant Downwind Low/Med594.31.0096
Predominant Downwind Medium491.31.2213
Predominant Downwind Med/High424.51.4134
Predominant Downwind High388.61.5441
Predominant Reaching Low678.80.8839
Predominant Reaching Low/Med512.41.1710
Predominant Reaching Medium445.21.3477
Predominant Reaching Med/High404.31.4841
Predominant Reaching High381.31.5735
SA/DSPL Upwind31.34SA/DSPL Downwind31.34
Scoring OptionTODTOT
5-Band Windward/Leeward Low976.30.6146
5-Band Windward/Leeward Low/Med702.60.8539
5-Band Windward/Leeward Medium586.01.0238
5-Band Windward/Leeward Med/High511.31.1735
5-Band Windward/Leeward High476.51.2591
Windward/Leeward 60-40 Low951.60.6305
Windward/Leeward 60-40 Low/Med693.60.8650
Windward/Leeward 60-40 Medium587.61.0212
Windward/Leeward 60-40 Med/High521.91.1496
Windward/Leeward 60-40 High492.01.2196
5-Band AP Low709.90.8452
5-Band AP Low/Med545.61.0997
5-Band AP Medium471.01.2739
5-Band AP Med/High425.61.4097
5-Band AP High401.81.4935
5-Band SF Bay Tour - Low824.90.7273
5-Band SF Bay Tour - Low/Med663.90.9037
5-Band SF Bay Tour - Medium560.91.0697
5-Band SF Bay Tour - Med/High497.91.2051
5-Band SF Bay Tour - High467.61.2832
Chicago-Mac Upwind1.1131
Chicago-Mac All Purpose1.0969
Chicago-Mac Downwind1.0667
Bayview-Mac Cove Island0.7838
Bayview-Mac Shore0.7955
Harvest Moon Regatta416.51.4404
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance527.8
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating (Coastal/Long Distance)527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance1.1369
Triple Number Coastal/Long Distance Low0.9549
Triple Number Coastal/Long Distance Medium1.2540
Triple Number Coastal/Long Distance High1.4325
Triple Number Windward/Leeward Low0.7252
Triple Number Windward/Leeward Medium1.0028
Triple Number Windward/Leeward High1.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
For information
General Purpose Handicap (GPH)542.0
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low628.3
Triple Number Coastal/Long Distance Medium478.5
Triple Number Coastal/Long Distance High418.8
Triple Number Windward/Leeward Low827.4
Triple Number Windward/Leeward Medium598.3
Triple Number Windward/Leeward High501.1
Predominantly Upwind503.7
Predominantly Downwind511.4
Predominantly Reaching475.8
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9549
Triple Number Coastal/Long Distance Medium1.2540
Triple Number Coastal/Long Distance High1.4325
Triple Number Windward/Leeward Low0.7252
Triple Number Windward/Leeward Medium1.0028
Triple Number Windward/Leeward High1.1974
Coastal/Long Distance1.1369
Predominantly Upwind1.1913
Predominantly Downwind1.1732
For information
General Purpose Handicap (GPH)542.0
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)1.2483
Distanseseilas Trippeltall svak vind0.9549
Distanseseilas Trippeltall mellomvind1.2540
Distanseseilas Trippeltall sterk vind1.4325
Pølsebane Trippeltall svak vind0.7252
Pølsebane Trippeltall mellomvind1.0028
Pølsebane Trippeltall sterk vind1.1974
Motvind Singeltall1.1913
Medvind Singeltall1.1732
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Coastal/Long Distance527.81.1369
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind503.71.1913
Predominantly Downwind511.41.1732
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore462.51.2974
Cape Doctor Coastal390.21.5378
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9549
Triple Number Coastal/Long Distance Medium1.2540
Triple Number Coastal/Long Distance High1.4325
Triple Number Windward/Leeward Low0.7252
Triple Number Windward/Leeward Medium1.0028
Triple Number Windward/Leeward High1.1974
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9549
Triple Number Coastal/Long Distance Medium1.2540
Triple Number Coastal/Long Distance High1.4325
Triple Number Windward/Leeward Low0.7252
Triple Number Windward/Leeward Medium1.0028
Triple Number Windward/Leeward High1.1974
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Predominantly Upwind503.71.1913
Predominantly Downwind511.41.1732
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance527.81.1369
Triple Number Coastal/Long Distance Low628.30.9549
Triple Number Coastal/Long Distance Medium478.51.2540
Triple Number Coastal/Long Distance High418.81.4325
Triple Number Windward/Leeward Low827.40.7252
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1452.1934.8688.7568.8497.1457.7428.1384.0366.7
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low628.40.9549
Triple Number AP Medium478.51.2539
Triple Number AP High418.81.4325
Triple Number Windward/Leeward Low867.70.6915
Triple Number Windward/Leeward Medium598.31.0028
Triple Number Windward/Leeward High501.11.1974
Single Number Predominant Upwind523.01.1472
Single Number Predominant Reaching478.61.2536
Single Number Predominant Downwind537.81.1156
Predominant Upwind - Low718.30.8353
Predominant Upwind - Low/Med549.81.0913
Predominant Upwind - Medium488.21.2289
Predominant Upwind - Med/High454.21.3210
Predominant Upwind - High437.61.3712
Predominant Downwind Low828.60.7241
Predominant Downwind Low/Med594.31.0096
Predominant Downwind Medium491.31.2213
Predominant Downwind Med/High424.51.4134
Predominant Downwind High388.61.5441
Predominant Reaching Low678.80.8839
Predominant Reaching Low/Med512.41.1710
Predominant Reaching Medium445.21.3477
Predominant Reaching Med/High404.31.4841
Predominant Reaching High381.31.5735
SA/DSPL Upwind31.34SA/DSPL Downwind31.34
Scoring OptionTODTOT
5-Band Windward/Leeward Low976.30.6146
5-Band Windward/Leeward Low/Med702.60.8539
5-Band Windward/Leeward Medium586.01.0238
5-Band Windward/Leeward Med/High511.31.1735
5-Band Windward/Leeward High476.51.2591
Windward/Leeward 60-40 Low951.60.6305
Windward/Leeward 60-40 Low/Med693.60.8650
Windward/Leeward 60-40 Medium587.61.0212
Windward/Leeward 60-40 Med/High521.91.1496
Windward/Leeward 60-40 High492.01.2196
5-Band AP Low709.90.8452
5-Band AP Low/Med545.61.0997
5-Band AP Medium471.01.2739
5-Band AP Med/High425.61.4097
5-Band AP High401.81.4935
5-Band SF Bay Tour - Low824.90.7273
5-Band SF Bay Tour - Low/Med663.90.9037
5-Band SF Bay Tour - Medium560.91.0697
5-Band SF Bay Tour - Med/High497.91.2051
5-Band SF Bay Tour - High467.61.2832
Chicago-Mac Upwind1.1131
Chicago-Mac All Purpose1.0969
Chicago-Mac Downwind1.0667
Bayview-Mac Cove Island0.7838
Bayview-Mac Shore0.7955
Harvest Moon Regatta416.51.4404
Non Spin/HSFClub Certificate2025
ThunderchildRSA-1027
ORC
Central Rating Office
Issuing certificates for
SOUTH AFRICA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassLavranos 52Measurement23/09/1992HINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA15.740Max. Beam4.748Draft3.149Displacement10,950Wetted area47.65IMS L13.448LSM013.051Acc. length15.431Sink (kg/mm) 34.01
VCGD-0.113VCGM-0.069RM Rated (kg·m) 407.2Limit of positive stability(°) N/AStability IndexN/ADefault crew weight1,006Declared crew weightN/A
PROPELLER
Propeller TypeFolding 3 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.450PBW0.155PIPA0.0053
PSD0.030PHD0.070PHL0.142
PSA17.5°ESL0.900
ST10.030ST20.120ST30.120
ST40.060ST50.195
RIG
Forestay tensionAftInner stayNone FittedMast materialCarbonSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0Checkstays0Spreaders4Rotating mastNo
P21.985IG20.875ISP24.312MDT10.138MDL10.248MDT2MDL2TLTaperMW0.248GO
E7.250J5.860BAS2.230FSDSFJ0.000SPLWPLTPS7.570BD0.360MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM estimatedFlotation Date14/02/2017
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Non Spin/HSFClub Certificate2025
ThunderchildRSA-1027
ORC
Central Rating Office
Issuing certificates for
SOUTH AFRICA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment10.201.532.744.595.8893.24
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment30.140.971.663.114.666.1719.87YesNo 62.55