Club Certificate2025
MAI TONGCHN 0505
ORC
Central Rating Office
Issuing certificates for
CHINA
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 Angles48.4°48.4°46.4°45.2°45.1°45.6°46.3°48.6°53.8°
Beat VMG1.922.663.253.633.783.813.793.623.17
52°3.134.265.095.615.855.925.931.905.15
60°3.464.625.425.936.196.286.326.275.96
75°3.634.855.696.206.506.706.806.896.85
90°3.735.055.966.396.626.927.197.537.67
110°3.895.276.236.777.217.557.828.288.68
120°3.775.156.166.747.277.788.248.919.56
135°3.334.655.726.456.987.548.139.5811.59
150°2.783.964.995.846.446.897.368.4310.49
Run VMG2.413.434.325.065.606.026.417.309.09
Gybe Angles144.9°144.9°148.0°149.4°152.8°157.8°156.8°146.7°141.3°
APH ToD:657.3CDL: 6.345APH ToT: 0.9128CertNo:
BOAT
ClassDjango 7.70 TKDesignerPierre RolandBuilderMaree HauteAge date04/2011Series date03/2011Offset fileDJ770-TK-DV.offData fileCHN 0505
HULL
Length Overall7.700 mMaximum Beam3.004 mDraft1.063 mDisplacement2,300 kgDLR4.5716IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.455%
PROPELLER
InstallationStrutTypeSolid 2 bladesDiameterm
CREW
Maximum weight260 kg(declared)Minimum weight130 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail23.6924.36Headsail Luffed17.8217.82Headsail FlyingSymmetricAsymmetric65.2565.25 (All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS (m²)
Trysail6.58Storm Jib6.23Heavy Weather Jib16.81
SAIL LIMITS
Headsails5
✱ One set on the forestay
Spinnakers4
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  038800041AFIssued on 07/10/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
MAI TONGCHN 0505
ORC
Central Rating Office
Issuing certificates for
CHINA
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 VMG1877.61353.11107.9991.8952.2943.8948.8994.51134.6
52°1150.6845.9707.8641.5615.6608.3607.31896.7698.6
60°1039.9779.1664.5607.3581.7573.1569.2574.1604.2
75°991.6742.2633.1580.3553.5537.7529.6522.2525.9
90°964.1713.5604.5563.2543.6520.1500.9478.1469.4
110°925.6683.7577.7531.8499.2476.8460.7434.8414.8
120°955.2699.0584.6533.9495.1462.9436.9403.9376.6
135°1081.6773.8629.2558.0515.5477.3442.6375.6310.5
150°1296.0910.1721.6616.4558.8522.5489.2427.2343.1
Run VMG1496.91050.9833.3711.7642.7597.7561.7493.3396.2
Selected Courses
Windward / Leeward1686.81202.0970.6851.8797.4770.7755.2743.9765.4
All purpose1261.6912.8750.6671.3633.0610.5595.7616.0590.4
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward833.60.7198
All purpose657.30.9128
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.5760
Downwind "popa"0.8587
70% up, 30% down "Ilhabela"0.6391
30% up, 70% down "Ilhabela-inverso"0.7485
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Predominantly Upwind737.20.8139
Predominantly Downwind634.50.9456
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low831.70.7214
Triple Number AP Medium650.00.9231
Triple Number AP High607.00.9884
Triple Number Windward/Leeward Low1134.50.5289
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Single Number Predominant Upwind807.10.7434
Single Number Predominant Reaching653.70.9179
Single Number Predominant Downwind672.10.8927
Predominant Upwind - Low1047.70.5727
Predominant Upwind - Low/Med800.70.7494
Predominant Upwind - Medium714.30.8400
Predominant Upwind - Med/High757.90.7917
Predominant Upwind - High974.50.6157
Predominant Downwind Low955.30.6281
Predominant Downwind Low/Med713.10.8414
Predominant Downwind Medium614.50.9764
Predominant Downwind Med/High574.41.0446
Predominant Downwind High598.31.0028
Predominant Reaching Low874.90.6858
Predominant Reaching Low/Med671.60.8934
Predominant Reaching Medium594.91.0085
Predominant Reaching Med/High586.71.0226
Predominant Reaching High671.70.8932
SA/DSPL Upwind23.76SA/DSPL Downwind50.90
Scoring OptionTODTOT
5-Band Windward/Leeward Low1265.50.4741
5-Band Windward/Leeward Low/Med937.20.6402
5-Band Windward/Leeward Medium812.80.7382
5-Band Windward/Leeward Med/High759.50.7900
5-Band Windward/Leeward High749.60.8004
Windward/Leeward 60-40 Low1296.90.4626
Windward/Leeward 60-40 Low/Med965.80.6213
Windward/Leeward 60-40 Medium844.20.7107
Windward/Leeward 60-40 Med/High798.80.7511
Windward/Leeward 60-40 High801.80.7483
5-Band AP Low898.70.6677
5-Band AP Low/Med729.10.8229
5-Band AP Medium642.20.9343
5-Band AP Med/High604.90.9919
5-Band AP High608.10.9867
5-Band SF Bay Tour - Low1099.30.5458
5-Band SF Bay Tour - Low/Med901.00.6659
5-Band SF Bay Tour - Medium786.10.7633
5-Band SF Bay Tour - Med/High741.00.8097
5-Band SF Bay Tour - High744.50.8059
Chicago-Mac Upwind0.7373
Chicago-Mac All Purpose0.8017
Chicago-Mac Downwind0.8668
Bayview-Mac Cove Island0.5967
Bayview-Mac Shore0.5996
Harvest Moon Regatta539.21.1127
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance716.1
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating716.10.8379
FinRating, kevyt tuuli1231.00.8123
FinRating, kova tuuli585.50.8540
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.8379
Triple Number Coastal/Long Distance Low0.7214
Triple Number Coastal/Long Distance Medium0.9232
Triple Number Coastal/Long Distance High0.9884
Triple Number Windward/Leeward Low0.5523
Triple Number Windward/Leeward Medium0.7288
Triple Number Windward/Leeward High0.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
For information
General Purpose Handicap (GPH)733.9
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low831.7
Triple Number Coastal/Long Distance Medium649.9
Triple Number Coastal/Long Distance High607.0
Triple Number Windward/Leeward Low1086.4
Triple Number Windward/Leeward Medium823.3
Triple Number Windward/Leeward High754.9
Predominantly Upwind737.2
Predominantly Downwind634.5
Predominantly Reaching613.9
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7214
Triple Number Coastal/Long Distance Medium0.9232
Triple Number Coastal/Long Distance High0.9884
Triple Number Windward/Leeward Low0.5523
Triple Number Windward/Leeward Medium0.7288
Triple Number Windward/Leeward High0.7948
Coastal/Long Distance0.8379
Predominantly Upwind0.8139
Predominantly Downwind0.9456
For information
General Purpose Handicap (GPH)733.9
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.9128
Distanseseilas Trippeltall svak vind0.7214
Distanseseilas Trippeltall mellomvind0.9232
Distanseseilas Trippeltall sterk vind0.9884
Pølsebane Trippeltall svak vind0.5523
Pølsebane Trippeltall mellomvind0.7288
Pølsebane Trippeltall sterk vind0.7948
Motvind Singeltall0.8139
Medvind Singeltall0.9456
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Coastal/Long Distance716.10.8379
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind737.20.8139
Predominantly Downwind634.50.9456
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore759.00.7906
Cape Doctor Coastal598.11.0032
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7214
Triple Number Coastal/Long Distance Medium0.9232
Triple Number Coastal/Long Distance High0.9884
Triple Number Windward/Leeward Low0.5523
Triple Number Windward/Leeward Medium0.7288
Triple Number Windward/Leeward High0.7948
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7214
Triple Number Coastal/Long Distance Medium0.9232
Triple Number Coastal/Long Distance High0.9884
Triple Number Windward/Leeward Low0.5523
Triple Number Windward/Leeward Medium0.7288
Triple Number Windward/Leeward High0.7948
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Predominantly Upwind737.20.8139
Predominantly Downwind634.50.9456
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance716.10.8379
Triple Number Coastal/Long Distance Low831.70.7214
Triple Number Coastal/Long Distance Medium649.90.9232
Triple Number Coastal/Long Distance High607.00.9884
Triple Number Windward/Leeward Low1086.40.5523
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1766.31186.9905.3760.8681.8635.3595.6531.6526.5
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low831.70.7214
Triple Number AP Medium650.00.9231
Triple Number AP High607.00.9884
Triple Number Windward/Leeward Low1134.50.5289
Triple Number Windward/Leeward Medium823.30.7288
Triple Number Windward/Leeward High754.90.7948
Single Number Predominant Upwind807.10.7434
Single Number Predominant Reaching653.70.9179
Single Number Predominant Downwind672.10.8927
Predominant Upwind - Low1047.70.5727
Predominant Upwind - Low/Med800.70.7494
Predominant Upwind - Medium714.30.8400
Predominant Upwind - Med/High757.90.7917
Predominant Upwind - High974.50.6157
Predominant Downwind Low955.30.6281
Predominant Downwind Low/Med713.10.8414
Predominant Downwind Medium614.50.9764
Predominant Downwind Med/High574.41.0446
Predominant Downwind High598.31.0028
Predominant Reaching Low874.90.6858
Predominant Reaching Low/Med671.60.8934
Predominant Reaching Medium594.91.0085
Predominant Reaching Med/High586.71.0226
Predominant Reaching High671.70.8932
SA/DSPL Upwind23.76SA/DSPL Downwind50.90
Scoring OptionTODTOT
5-Band Windward/Leeward Low1265.50.4741
5-Band Windward/Leeward Low/Med937.20.6402
5-Band Windward/Leeward Medium812.80.7382
5-Band Windward/Leeward Med/High759.50.7900
5-Band Windward/Leeward High749.60.8004
Windward/Leeward 60-40 Low1296.90.4626
Windward/Leeward 60-40 Low/Med965.80.6213
Windward/Leeward 60-40 Medium844.20.7107
Windward/Leeward 60-40 Med/High798.80.7511
Windward/Leeward 60-40 High801.80.7483
5-Band AP Low898.70.6677
5-Band AP Low/Med729.10.8229
5-Band AP Medium642.20.9343
5-Band AP Med/High604.90.9919
5-Band AP High608.10.9867
5-Band SF Bay Tour - Low1099.30.5458
5-Band SF Bay Tour - Low/Med901.00.6659
5-Band SF Bay Tour - Medium786.10.7633
5-Band SF Bay Tour - Med/High741.00.8097
5-Band SF Bay Tour - High744.50.8059
Chicago-Mac Upwind0.7373
Chicago-Mac All Purpose0.8017
Chicago-Mac Downwind0.8668
Bayview-Mac Cove Island0.5967
Bayview-Mac Shore0.5996
Harvest Moon Regatta539.21.1127
ORC Ref  038800041AFIssued on 07/10/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
MAI TONGCHN 0505
ORC
Central Rating Office
Issuing certificates for
CHINA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassDjango 7.70 TKMeasurement07/10/2025HINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA7.700Max. Beam3.004Draft1.063Displacement2,300Wetted area15.89IMS L7.770LSM07.953Acc. length7.700Sink (kg/mm) 12.55
VCGD0.269VCGM0.216RM Rated (kg·m) 48.0Limit of positive stability(°) N/AStability IndexN/ADefault crew weight497Declared crew weight260
PROPELLER
Propeller TypeSolid 2 blades
InstallationStrutTwin screwNoHydro generatorNo
PRDPBW
EDLST1ST2
ST3ST4ST5
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerYesMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders2Rotating mastNo
P10.400IG11.156ISP11.680MDT10.085MDL10.139MDT2MDL2TLNo TaperMWGO
E3.610J3.050BAS1.380FSDSFJSPLWPLTPS4.000BDMWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM estimatedFlotation Date07/10/2025
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  038800041AFIssued on 07/10/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org
Club Certificate2025
MAI TONGCHN 0505
ORC
Central Rating Office
Issuing certificates for
CHINA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment11.031.612.4723.69
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment10.240.791.593.3310.94NoNo 17.82
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateComment112.8711.1212.006.496.6897%65.25
ORC Ref  038800041AFIssued on 07/10/2025Valid until 31/12/2025
VPP ver: 2025 1.01 | © ORC | www.orc.org