Double HandedClub Certificate2025
GIGIRSA-4387
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 Angles41.9°41.9°39.7°38.1°37.5°37.2°37.1°38.4°40.6°
Beat VMG2.713.734.484.814.965.045.105.084.91
52°4.175.596.516.846.987.067.137.177.11
60°4.435.856.717.047.187.287.357.437.40
75°4.636.026.837.257.487.637.757.897.93
90°4.806.116.797.267.657.948.148.428.59
110°4.886.357.197.587.928.218.499.009.54
120°4.766.267.207.788.198.578.949.6810.40
135°4.045.626.847.528.178.929.7311.0312.54
150°3.364.735.906.837.508.068.7011.0614.51
Run VMG2.914.105.115.916.536.997.549.5812.56
Gybe Angles142.6°142.6°146.9°150.5°153.7°151.6°147.6°144.3°149.0°
APH ToD:537.9CDL: 8.757APH ToT: 1.1154CertNo:ZAD060
BOAT
ClassMOUNT GAY 30DesignerDUDLEY DIXBuilderYILDUN YACHTSAge date01/2012Series date01/2012Offset fileMG30.offData fileRSA4387
HULL
Length Overall9.600 mMaximum Beam3.238 mDraft2.240 mDisplacement3,209 kgDLR4.4280IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.422%
PROPELLER
InstallationNo PropellerTypeN/ADiameterN/A
CREW
Maximum weight170 kg(default)Minimum weight120 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail37.3238.25Headsail Luffed21.9821.98Headsail FlyingSymmetricAsymmetric117.70117.70 (All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS (m²)
Trysail10.42Storm Jib6.84Heavy Weather Jib18.47
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.
Double HandedClub Certificate2025
GIGIRSA-4387
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 VMG1329.8964.5802.9748.3725.8713.9706.2708.7733.4
52°862.4643.6552.6526.5516.0509.6505.2501.8506.1
60°812.3615.5536.2511.3501.2494.5489.6484.7486.2
75°777.5597.7526.8496.8481.2471.8464.5456.4453.8
90°749.4589.4530.5495.8470.8453.3442.0427.4418.9
110°738.0567.1500.7474.7454.8438.4424.2400.0377.4
120°756.0575.3499.9462.6439.4420.2402.7371.9346.1
135°890.3640.1526.6478.6440.7403.8370.0326.5287.1
150°1071.6760.6610.4527.4480.2446.7413.6325.5248.2
Run VMG1238.1878.3704.8608.8551.5515.2477.6375.8286.5
Selected Courses
Windward / Leeward1284.0921.4753.9678.5638.7614.6591.9542.3510.0
All purpose969.4714.7602.1553.6526.1507.0490.3460.4441.3
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward658.00.9119
All purpose537.91.1154
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7821
Downwind "popa"1.0214
70% up, 30% down "Ilhabela"0.8412
30% up, 70% down "Ilhabela-inverso"0.9355
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Predominantly Upwind587.91.0205
Predominantly Downwind529.61.1329
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low658.40.9113
Triple Number AP Medium536.91.1176
Triple Number AP High483.21.2416
Triple Number Windward/Leeward Low874.70.6859
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Single Number Predominant Upwind609.00.9852
Single Number Predominant Reaching527.11.1382
Single Number Predominant Downwind547.81.0952
Predominant Upwind - Low795.00.7547
Predominant Upwind - Low/Med630.30.9519
Predominant Upwind - Medium575.51.0426
Predominant Upwind - Med/High544.81.1013
Predominant Upwind - High529.61.1330
Predominant Downwind Low773.00.7762
Predominant Downwind Low/Med592.41.0129
Predominant Downwind Medium516.91.1608
Predominant Downwind Med/High457.71.3110
Predominant Downwind High408.81.4676
Predominant Reaching Low699.20.8581
Predominant Reaching Low/Med557.61.0761
Predominant Reaching Medium501.01.1975
Predominant Reaching Med/High459.21.3066
Predominant Reaching High432.21.3881
SA/DSPL Upwind27.15SA/DSPL Downwind70.97
Scoring OptionTODTOT
5-Band Windward/Leeward Low970.10.6185
5-Band Windward/Leeward Low/Med735.00.8164
5-Band Windward/Leeward Medium647.00.9274
5-Band Windward/Leeward Med/High591.31.0148
5-Band Windward/Leeward High545.31.1004
Windward/Leeward 60-40 Low979.20.6127
Windward/Leeward 60-40 Low/Med747.20.8030
Windward/Leeward 60-40 Medium664.00.9036
Windward/Leeward 60-40 Med/High614.90.9757
Windward/Leeward 60-40 High578.71.0368
5-Band AP Low717.00.8368
5-Band AP Low/Med590.41.0163
5-Band AP Medium530.81.1303
5-Band AP Med/High491.11.2218
5-Band AP High462.21.2981
5-Band SF Bay Tour - Low840.70.7137
5-Band SF Bay Tour - Low/Med704.50.8517
5-Band SF Bay Tour - Medium624.70.9604
5-Band SF Bay Tour - Med/High574.51.0444
5-Band SF Bay Tour - High536.81.1177
Chicago-Mac Upwind0.9606
Chicago-Mac All Purpose1.0083
Chicago-Mac Downwind1.0556
Bayview-Mac Cove Island0.7625
Bayview-Mac Shore0.7669
Harvest Moon Regatta463.51.2945
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance582.3
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating (Coastal/Long Distance)582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance1.0304
Triple Number Coastal/Long Distance Low0.9113
Triple Number Coastal/Long Distance Medium1.1177
Triple Number Coastal/Long Distance High1.2416
Triple Number Windward/Leeward Low0.7163
Triple Number Windward/Leeward Medium0.9153
Triple Number Windward/Leeward High1.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
For information
General Purpose Handicap (GPH)596.6
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low658.4
Triple Number Coastal/Long Distance Medium536.8
Triple Number Coastal/Long Distance High483.2
Triple Number Windward/Leeward Low837.6
Triple Number Windward/Leeward Medium655.5
Triple Number Windward/Leeward High579.0
Predominantly Upwind587.9
Predominantly Downwind529.6
Predominantly Reaching514.5
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9113
Triple Number Coastal/Long Distance Medium1.1177
Triple Number Coastal/Long Distance High1.2416
Triple Number Windward/Leeward Low0.7163
Triple Number Windward/Leeward Medium0.9153
Triple Number Windward/Leeward High1.0363
Coastal/Long Distance1.0304
Predominantly Upwind1.0205
Predominantly Downwind1.1329
For information
General Purpose Handicap (GPH)596.6
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)1.1154
Distanseseilas Trippeltall svak vind0.9113
Distanseseilas Trippeltall mellomvind1.1177
Distanseseilas Trippeltall sterk vind1.2416
Pølsebane Trippeltall svak vind0.7163
Pølsebane Trippeltall mellomvind0.9153
Pølsebane Trippeltall sterk vind1.0363
Motvind Singeltall1.0205
Medvind Singeltall1.1329
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Coastal/Long Distance582.31.0304
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind587.91.0205
Predominantly Downwind529.61.1329
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore519.71.1546
Cape Doctor Coastal447.01.3423
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9113
Triple Number Coastal/Long Distance Medium1.1177
Triple Number Coastal/Long Distance High1.2416
Triple Number Windward/Leeward Low0.7163
Triple Number Windward/Leeward Medium0.9153
Triple Number Windward/Leeward High1.0363
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9113
Triple Number Coastal/Long Distance Medium1.1177
Triple Number Coastal/Long Distance High1.2416
Triple Number Windward/Leeward Low0.7163
Triple Number Windward/Leeward Medium0.9153
Triple Number Windward/Leeward High1.0363
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Predominantly Upwind587.91.0205
Predominantly Downwind529.61.1329
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance582.31.0304
Triple Number Coastal/Long Distance Low658.40.9113
Triple Number Coastal/Long Distance Medium536.81.1177
Triple Number Coastal/Long Distance High483.21.2416
Triple Number Windward/Leeward Low837.60.7163
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1348.3917.1711.9616.6560.7526.6495.8440.6418.7
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low658.40.9113
Triple Number AP Medium536.91.1176
Triple Number AP High483.21.2416
Triple Number Windward/Leeward Low874.70.6859
Triple Number Windward/Leeward Medium655.50.9153
Triple Number Windward/Leeward High579.01.0363
Single Number Predominant Upwind609.00.9852
Single Number Predominant Reaching527.11.1382
Single Number Predominant Downwind547.81.0952
Predominant Upwind - Low795.00.7547
Predominant Upwind - Low/Med630.30.9519
Predominant Upwind - Medium575.51.0426
Predominant Upwind - Med/High544.81.1013
Predominant Upwind - High529.61.1330
Predominant Downwind Low773.00.7762
Predominant Downwind Low/Med592.41.0129
Predominant Downwind Medium516.91.1608
Predominant Downwind Med/High457.71.3110
Predominant Downwind High408.81.4676
Predominant Reaching Low699.20.8581
Predominant Reaching Low/Med557.61.0761
Predominant Reaching Medium501.01.1975
Predominant Reaching Med/High459.21.3066
Predominant Reaching High432.21.3881
SA/DSPL Upwind27.15SA/DSPL Downwind70.97
Scoring OptionTODTOT
5-Band Windward/Leeward Low970.10.6185
5-Band Windward/Leeward Low/Med735.00.8164
5-Band Windward/Leeward Medium647.00.9274
5-Band Windward/Leeward Med/High591.31.0148
5-Band Windward/Leeward High545.31.1004
Windward/Leeward 60-40 Low979.20.6127
Windward/Leeward 60-40 Low/Med747.20.8030
Windward/Leeward 60-40 Medium664.00.9036
Windward/Leeward 60-40 Med/High614.90.9757
Windward/Leeward 60-40 High578.71.0368
5-Band AP Low717.00.8368
5-Band AP Low/Med590.41.0163
5-Band AP Medium530.81.1303
5-Band AP Med/High491.11.2218
5-Band AP High462.21.2981
5-Band SF Bay Tour - Low840.70.7137
5-Band SF Bay Tour - Low/Med704.50.8517
5-Band SF Bay Tour - Medium624.70.9604
5-Band SF Bay Tour - Med/High574.51.0444
5-Band SF Bay Tour - High536.81.1177
Chicago-Mac Upwind0.9606
Chicago-Mac All Purpose1.0083
Chicago-Mac Downwind1.0556
Bayview-Mac Cove Island0.7625
Bayview-Mac Shore0.7669
Harvest Moon Regatta463.51.2945
Double HandedClub Certificate2025
GIGIRSA-4387
ORC
Central Rating Office
Issuing certificates for
SOUTH AFRICA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassMOUNT GAY 30Measurement12/04/2021HINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA9.600Max. Beam3.238Draft2.240Displacement3,209Wetted area20.66IMS L9.049LSM08.982Acc. length9.600Sink (kg/mm) 16.16
VCGD0.024VCGM-0.025RM Rated (kg·m) 96.1Limit of positive stability(°) N/AStability IndexN/ADefault crew weight170Declared crew weightN/A
PROPELLER
Propeller TypeNo Propeller
Hydro generatorNo
RIG
Forestay tensionAftInner stayNone FittedMast materialCarbonSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0Checkstays0Spreaders2Rotating mastNo
P13.230IG12.265ISP14.525MDT10.090MDL10.170MDT2MDL2TLTaperMW0.170GO
E4.500J3.490BAS1.515FSDNo FoilSFJ0.000SPL0.000WPLTPS4.520BD0.250MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM estimatedFlotation Date17/04/2021
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Double HandedClub Certificate2025
GIGIRSA-4387
ORC
Central Rating Office
Issuing certificates for
SOUTH AFRICA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment10.311.151.923.093.8537.3213/02/2021
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentN030.130.530.981.822.703.6011.98YesNo 21.9813/02/20214x battens
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateCommentNew A215.7413.7414.749.539.7997%117.70WHITE15.8313.8114.828.337.88106%101.7613/02/20210,75oz