Non Spin/HSFClub Certificate2025
Rock n'Roll351
Australian Sailing Ltd
Locked Bag 806
Milsons Point
NSW 1565
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 Angles42.6°42.6°40.3°38.6°38.0°37.6°37.4°38.0°40.0°
Beat VMG2.833.894.685.055.225.325.395.415.22
52°4.435.906.837.217.377.487.557.627.55
60°4.746.207.057.427.607.737.827.927.85
75°4.986.407.197.617.918.128.288.498.57
90°4.826.287.157.638.058.428.739.199.50
110°3.985.516.687.367.868.388.939.8410.76
120°3.485.026.337.167.688.208.7810.1911.50
135°2.914.265.536.577.247.728.249.5211.34
150°2.393.554.675.706.557.167.608.519.71
Run VMG2.073.074.054.935.756.567.178.099.16
Gybe Angles143.5°143.5°145.7°147.1°175.4°180.0°179.9°179.9°180.0°
APH ToD:549.7CDL: 9.464APH ToT: 1.0915CertNo:2173
BOAT
ClassMD35DesignerMark MillsBuilderC Partridge Yachts NZAge date06/2024Series date06/2024Offset filemd35.offData file2173
HULL
Length Overall10.710 mMaximum Beam2.272 mDraft2.218 mDisplacement2,557 kgDLR3.7386IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.033%
PROPELLER
InstallationStrutTypeFolding 2 bladesDiameter0.289m
CREW
Maximum weight450 kg(declared)Minimum weight320 kg ✱ when appliedNon Manual PowerCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail31.3832.18Headsail Luffed20.5420.54Headsail FlyingSymmetricAsymmetric
STORM SAIL AREAS (m²)
Trysail9.09Storm Jib7.20Heavy Weather Jib19.44
SAIL LIMITS
Headsails5
✱ 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.
ORC Ref  03020003VL8Issued on 14/07/2025Valid until 30/06/2026
VPP ver: 2025 1.01 | © ORC | www.orc.org
Non Spin/HSFClub Certificate2025
Rock n'Roll351
Australian Sailing Ltd
Locked Bag 806
Milsons Point
NSW 1565
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 VMG1273.9925.2769.9713.3689.1676.3667.6665.5689.0
52°812.9610.6526.9499.5488.2481.6476.8472.2476.7
60°759.0580.9510.7485.5473.4465.9460.5454.4458.5
75°723.6562.1500.9473.2455.0443.1435.0423.9420.3
90°747.0573.0503.6472.0447.4427.7412.3391.8378.8
110°904.2653.1538.6488.9458.1429.6403.3366.0334.6
120°1033.6717.5568.5503.0469.0439.1410.2353.3312.9
135°1239.1845.2651.5547.8497.2466.1436.9378.1317.4
150°1508.51014.6770.3632.1549.5502.8473.9423.0370.9
Run VMG1742.61171.6889.4729.9626.0548.9501.9444.8393.0
Selected Courses
Windward / Leeward1505.61048.4829.7721.6657.5612.6584.7555.1541.0
All purpose1102.9787.9640.7571.0531.8505.1485.8458.6441.2
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward685.70.8750
All purpose549.71.0915
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.8224
Downwind "popa"0.8550
70% up, 30% down "Ilhabela"0.8319
30% up, 70% down "Ilhabela-inverso"0.8449
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Predominantly Upwind581.21.0324
Predominantly Downwind578.31.0376
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low714.30.8400
Triple Number AP Medium547.31.0963
Triple Number AP High480.41.2490
Triple Number Windward/Leeward Low985.10.6091
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Single Number Predominant Upwind603.00.9950
Single Number Predominant Reaching545.11.1007
Single Number Predominant Downwind608.10.9866
Predominant Upwind - Low817.10.7343
Predominant Upwind - Low/Med630.90.9510
Predominant Upwind - Medium564.41.0630
Predominant Upwind - Med/High528.11.1361
Predominant Upwind - High511.61.1727
Predominant Downwind Low940.60.6379
Predominant Downwind Low/Med671.20.8940
Predominant Downwind Medium555.41.0803
Predominant Downwind Med/High480.31.2491
Predominant Downwind High435.81.3769
Predominant Reaching Low771.00.7782
Predominant Reaching Low/Med583.71.0279
Predominant Reaching Medium508.71.1794
Predominant Reaching Med/High460.31.3034
Predominant Reaching High429.71.3964
SA/DSPL Upwind27.68SA/DSPL Downwind27.68
Scoring OptionTODTOT
5-Band Windward/Leeward Low1108.70.5412
5-Band Windward/Leeward Low/Med798.40.7515
5-Band Windward/Leeward Medium668.80.8971
5-Band Windward/Leeward Med/High590.61.0160
5-Band Windward/Leeward High557.81.0756
Windward/Leeward 60-40 Low1081.60.5547
Windward/Leeward 60-40 Low/Med790.90.7587
Windward/Leeward 60-40 Medium674.20.8899
Windward/Leeward 60-40 Med/High606.60.9892
Windward/Leeward 60-40 High580.21.0341
5-Band AP Low807.10.7434
5-Band AP Low/Med621.70.9651
5-Band AP Medium539.01.1131
5-Band AP Med/High488.31.2287
5-Band AP High460.31.3036
5-Band SF Bay Tour - Low937.40.6401
5-Band SF Bay Tour - Low/Med755.70.7940
5-Band SF Bay Tour - Medium642.30.9342
5-Band SF Bay Tour - Med/High576.31.0411
5-Band SF Bay Tour - High546.21.0985
Chicago-Mac Upwind0.9668
Chicago-Mac All Purpose0.9616
Chicago-Mac Downwind0.9438
Bayview-Mac Cove Island0.6885
Bayview-Mac Shore0.6986
Harvest Moon Regatta471.31.2732
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance602.6
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating602.60.9957
FinRating, kevyt tuuli1092.40.9154
FinRating, kova tuuli462.11.0819
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.9957
Triple Number Coastal/Long Distance Low0.8400
Triple Number Coastal/Long Distance Medium1.0964
Triple Number Coastal/Long Distance High1.2490
Triple Number Windward/Leeward Low0.6390
Triple Number Windward/Leeward Medium0.8798
Triple Number Windward/Leeward High1.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
For information
General Purpose Handicap (GPH)619.0
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low714.3
Triple Number Coastal/Long Distance Medium547.2
Triple Number Coastal/Long Distance High480.4
Triple Number Windward/Leeward Low939.0
Triple Number Windward/Leeward Medium682.0
Triple Number Windward/Leeward High580.6
Predominantly Upwind581.2
Predominantly Downwind578.3
Predominantly Reaching540.6
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8400
Triple Number Coastal/Long Distance Medium1.0964
Triple Number Coastal/Long Distance High1.2490
Triple Number Windward/Leeward Low0.6390
Triple Number Windward/Leeward Medium0.8798
Triple Number Windward/Leeward High1.0334
Coastal/Long Distance0.9957
Predominantly Upwind1.0324
Predominantly Downwind1.0376
For information
General Purpose Handicap (GPH)619.0
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)1.0915
Distanseseilas Trippeltall svak vind0.8400
Distanseseilas Trippeltall mellomvind1.0964
Distanseseilas Trippeltall sterk vind1.2490
Pølsebane Trippeltall svak vind0.6390
Pølsebane Trippeltall mellomvind0.8798
Pølsebane Trippeltall sterk vind1.0334
Motvind Singeltall1.0324
Medvind Singeltall1.0376
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Coastal/Long Distance602.60.9957
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind581.21.0324
Predominantly Downwind578.31.0376
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore545.31.1004
Cape Doctor Coastal446.41.3440
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8400
Triple Number Coastal/Long Distance Medium1.0964
Triple Number Coastal/Long Distance High1.2490
Triple Number Windward/Leeward Low0.6390
Triple Number Windward/Leeward Medium0.8798
Triple Number Windward/Leeward High1.0334
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8400
Triple Number Coastal/Long Distance Medium1.0964
Triple Number Coastal/Long Distance High1.2490
Triple Number Windward/Leeward Low0.6390
Triple Number Windward/Leeward Medium0.8798
Triple Number Windward/Leeward High1.0334
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Predominantly Upwind581.21.0324
Predominantly Downwind578.31.0376
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance602.60.9957
Triple Number Coastal/Long Distance Low714.30.8400
Triple Number Coastal/Long Distance Medium547.21.0964
Triple Number Coastal/Long Distance High480.41.2490
Triple Number Windward/Leeward Low939.00.6390
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1649.41060.7781.4647.8569.1524.9490.8433.6413.9
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low714.30.8400
Triple Number AP Medium547.31.0963
Triple Number AP High480.41.2490
Triple Number Windward/Leeward Low985.10.6091
Triple Number Windward/Leeward Medium682.00.8798
Triple Number Windward/Leeward High580.61.0334
Single Number Predominant Upwind603.00.9950
Single Number Predominant Reaching545.11.1007
Single Number Predominant Downwind608.10.9866
Predominant Upwind - Low817.10.7343
Predominant Upwind - Low/Med630.90.9510
Predominant Upwind - Medium564.41.0630
Predominant Upwind - Med/High528.11.1361
Predominant Upwind - High511.61.1727
Predominant Downwind Low940.60.6379
Predominant Downwind Low/Med671.20.8940
Predominant Downwind Medium555.41.0803
Predominant Downwind Med/High480.31.2491
Predominant Downwind High435.81.3769
Predominant Reaching Low771.00.7782
Predominant Reaching Low/Med583.71.0279
Predominant Reaching Medium508.71.1794
Predominant Reaching Med/High460.31.3034
Predominant Reaching High429.71.3964
SA/DSPL Upwind27.68SA/DSPL Downwind27.68
Scoring OptionTODTOT
5-Band Windward/Leeward Low1108.70.5412
5-Band Windward/Leeward Low/Med798.40.7515
5-Band Windward/Leeward Medium668.80.8971
5-Band Windward/Leeward Med/High590.61.0160
5-Band Windward/Leeward High557.81.0756
Windward/Leeward 60-40 Low1081.60.5547
Windward/Leeward 60-40 Low/Med790.90.7587
Windward/Leeward 60-40 Medium674.20.8899
Windward/Leeward 60-40 Med/High606.60.9892
Windward/Leeward 60-40 High580.21.0341
5-Band AP Low807.10.7434
5-Band AP Low/Med621.70.9651
5-Band AP Medium539.01.1131
5-Band AP Med/High488.31.2287
5-Band AP High460.31.3036
5-Band SF Bay Tour - Low937.40.6401
5-Band SF Bay Tour - Low/Med755.70.7940
5-Band SF Bay Tour - Medium642.30.9342
5-Band SF Bay Tour - Med/High576.31.0411
5-Band SF Bay Tour - High546.21.0985
Chicago-Mac Upwind0.9668
Chicago-Mac All Purpose0.9616
Chicago-Mac Downwind0.9438
Bayview-Mac Cove Island0.6885
Bayview-Mac Shore0.6986
Harvest Moon Regatta471.31.2732
ORC Ref  03020003VL8Issued on 14/07/2025Valid until 30/06/2026
VPP ver: 2025 1.01 | © ORC | www.orc.org
Non Spin/HSFClub Certificate2025
Rock n'Roll351
Australian Sailing Ltd
Locked Bag 806
Milsons Point
NSW 1565
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassMD35MeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA10.710Max. Beam2.272Draft2.218Displacement2,557Wetted area16.82IMS L9.536LSM08.810Acc. length7.384Sink (kg/mm) 11.54
VCGD-0.489VCGM-0.509RM Rated (kg·m) 50.3Limit of positive stability(°) N/AStability IndexN/ADefault crew weight575Declared crew weight450
PROPELLER
Propeller TypeFolding 2 blades
InstallationStrutTwin screwYesHydro generatorNo
PRD0.289PBWPIPA0.0007
EDLST1ST2
ST3ST4ST5
RIG
Forestay tensionAftInner stayNone FittedMast materialCarbonSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays1CheckstaysSpreaders1Rotating mastNo
P11.800IG12.000ISP12.700MDT10.135MDL10.160MDT2MDL2TLMWGO
E4.400J3.510BAS0.750FSDSFJ0.710SPLWPLTPS5.750BDMWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM estimatedFlotation Date09/08/2024
SFFP0.022FFM1.008FF1.008LCFcl5.692SG1.0253
SAFP10.709FAM0.786FA0.786LCFsh5.800HBI0.879
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  03020003VL8Issued on 14/07/2025Valid until 30/06/2026
VPP ver: 2025 1.01 | © ORC | www.orc.org
Non Spin/HSFClub Certificate2025
Rock n'Roll351
Australian Sailing Ltd
Locked Bag 806
Milsons Point
NSW 1565
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentM10.150.991.742.893.7131.3820/07/2024
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentJM0.120.540.961.862.723.5211.21YesNo 20.5420/07/2024
ORC Ref  03020003VL8Issued on 14/07/2025Valid until 30/06/2026
VPP ver: 2025 1.01 | © ORC | www.orc.org