International
Certificate
2023

Boat

Blackwatch

USA71

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Rated boat velocities in knots
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Beat Angles41.4°39.4°38.4°37.6°37.0°36.4°35.8°
Beat VMG4.545.325.786.086.276.426.61
52°6.767.758.308.608.798.919.07
60°7.068.028.548.839.019.139.27
75°7.258.178.689.009.219.369.54
90°7.118.088.719.099.369.569.82
110°6.728.008.759.199.429.599.89
120°6.607.908.709.189.539.8010.14
135°6.017.358.338.949.359.6910.32
150°5.086.287.378.258.829.239.87
Run VMG4.405.446.387.167.778.299.14
Gybe Angles143.3°146.0°146.6°152.0°157.0°163.1°176.6°

APH: 462.4

CDL: 13.817

GPH: 515.0

CertNo: USA71

BOAT
ClassCustomDesignerS&SBuilderNevinsAge date05/1938Series date05/1938Offset fileUSA71A.offData fileUSA71
HULL
Length Overall20.684 mMaximum Beam4.432 mDraft3.831 mDisplacement33,167 kgDLR10.9783IMS DivisionCruiser/RacerDynamic Allowance0.340%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeFolding 3 bladesDiameter0.610m
CREW
Maximum weight1,330 kgMinimum weight998 kg * when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail106.17108.11Mizzen22.7823.33Headsail Luffed151.01151.01Headsail FlyingSymmetric300.25300.25Asymmetric301.31301.31 (All asymmetric spinnakers with SHW/SFL > 85%) Mizzen Staysail50.8350.83
STORM SAIL AREAS (m²)
Trysail32.91Storm Jib28.10Heavy Weather Jib75.86
SAIL LIMITS
Headsails7  Spinnakers5 * Asymmetric may be tacked on the pole
STABILITY
Righting Moment681.1 kg·mStability Index162.5
COMMENTS
New rig 2019
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  04560002M5EIssued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

International
Certificate
2023

Boat

Blackwatch

USA71

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Time Allowances in secs/NM
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Beat VMG792.6676.9622.8592.4573.8560.5544.7
52°532.3464.2433.5418.7409.7404.0396.9
60°509.7448.9421.7407.6399.7394.5388.3
75°496.6440.7414.6400.2390.7384.6377.2
90°506.4445.4413.3395.9384.8376.6366.6
110°535.5450.0411.3391.9382.2375.3363.9
120°545.3455.5413.6392.1377.9367.3355.1
135°598.9490.1432.3402.7385.1371.5349.0
150°708.7573.4488.4436.5408.0390.2364.7
Run VMG818.3662.1564.0502.6463.2434.3393.9
Selected Courses
Windward / Leeward805.5669.5593.4547.5518.5497.4469.3
All purpose626.0528.5477.4448.7431.0418.7402.3
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward567.11.0581
All purpose462.41.2975
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.9625
Downwind "popa"1.0942
70% up, 30% down "Ilhabela"0.9985
30% up, 70% down "Ilhabela-inverso"1.0510
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Predominantly Upwind494.11.2143
Predominantly Downwind473.31.2676
Custom scoring options for Canada
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low577.31.0394
Triple Number All Purpose Medium460.51.3029
Triple Number All Purpose High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Predominantly Upwind494.11.2143
Predominantly Downwind473.31.2676
Predominantly Upwind Low630.10.9523
Predominantly Upwind Medium509.61.1775
Predominantly Upwind High473.11.2683
Predominantly Downwind Low638.90.9391
Predominantly Downwind Medium473.01.2685
Predominantly Downwind High403.31.4879
Chicago-Mac Upwind1.1939
Chicago-Mac All Purpose1.2170
Chicago-Mac Downwind1.2463
Bayview-Mac Cove Island1.1448
Bayview-Mac Shore1.1576
Scoring OptionTime On
Distance		Time On
Time
Predominantly Reaching440.11.3634
Predominantly Reaching Low526.31.1400
Predominantly Reaching Medium436.01.3761
Predominantly Reaching High391.11.5341
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low795.00.7547
5-Band Low / Medium682.10.8797
5-Band Medium556.31.0786
5-Band Medium / High500.51.1989
5-Band High474.21.2654
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance502.7
Triple Number Coastal/Long Distance Low577.3
Triple Number Coastal/Long Distance Medium460.5
Triple Number Coastal/Long Distance High415.6
Triple Number Windward/Leeward Low737.5
Triple Number Windward/Leeward Medium565.7
Triple Number Windward/Leeward High492.2
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating (Coastal/Long Distance)502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Custom scoring options for Germany
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low1.0394
Triple Number Coastal/Long Distance Medium1.3029
Triple Number Coastal/Long Distance High1.4437
Triple Number Windward/Leeward Low0.8136
Triple Number Windward/Leeward Medium1.0606
Triple Number Windward/Leeward High1.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low577.3
Triple Number Coastal/Long Distance Medium460.5
Triple Number Coastal/Long Distance High415.6
Triple Number Windward/Leeward Low737.5
Triple Number Windward/Leeward Medium565.7
Triple Number Windward/Leeward High492.2
Predominantly Upwind494.1
Predominantly Downwind473.3
Predominantly Reaching451.7
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low1.0394
Triple Number Coastal/Long Distance Medium1.3029
Triple Number Coastal/Long Distance High1.4437
Triple Number Windward/Leeward Low0.8136
Triple Number Windward/Leeward Medium1.0606
Triple Number Windward/Leeward High1.2191
Coastal/Long Distance1.1935
Predominantly Upwind1.2143
Predominantly Downwind1.2676
Custom scoring options for Norway
Scoring OptionTime On
Time
Tretall Distanseseilas Lite vind1.0394
Tretall Distanseseilas Mellomvind1.3029
Tretall Distanseseilas Mye vind1.4437
Tretall Pølsebane Lite vind0.8136
Tretall Pølsebane Mellomvind1.0606
Tretall Pølsebane Mye vind1.2191
Distanseseilas ett tall (OSN 8-16kn)1.1935
Distanseseilas ett tall (APH 6-20kn)1.2975
Enkeltall Motvind1.2143
Enkeltall Medvind1.2676
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Coastal/Long Distance502.71.1935
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind494.11.2143
Predominantly Downwind473.31.2676
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore477.71.2559
Cape Doctor Coastal407.21.4735
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low1.0394
Triple Number Coastal/Long Distance Medium1.3029
Triple Number Coastal/Long Distance High1.4437
Triple Number Windward/Leeward Low0.8136
Triple Number Windward/Leeward Medium1.0606
Triple Number Windward/Leeward High1.2191
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low1.0394
Triple Number Coastal/Long Distance Medium1.3029
Triple Number Coastal/Long Distance High1.4437
Triple Number Windward/Leeward Low0.8136
Triple Number Windward/Leeward Medium1.0606
Triple Number Windward/Leeward High1.2191
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Predominantly Upwind494.11.2143
Predominantly Downwind473.31.2676
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance502.71.1935
Triple Number Coastal/Long Distance Low577.31.0394
Triple Number Coastal/Long Distance Medium460.51.3029
Triple Number Coastal/Long Distance High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance806.8631.8536.4478.1446.7422.9389.5
Custom scoring options for United States of America
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low577.31.0394
Triple Number All Purpose Medium460.51.3029
Triple Number All Purpose High415.61.4437
Triple Number Windward/Leeward Low737.50.8136
Triple Number Windward/Leeward Medium565.71.0606
Triple Number Windward/Leeward High492.21.2191
Predominantly Upwind494.11.2143
Predominantly Downwind473.31.2676
Predominantly Upwind Low630.10.9523
Predominantly Upwind Medium509.61.1775
Predominantly Upwind High473.11.2683
Predominantly Downwind Low638.90.9391
Predominantly Downwind Medium473.01.2685
Predominantly Downwind High403.31.4879
Chicago-Mac Upwind1.1939
Chicago-Mac All Purpose1.2170
Chicago-Mac Downwind1.2463
Bayview-Mac Cove Island1.1448
Bayview-Mac Shore1.1576
Harvest Moon Regatta408.01.4705
Scoring OptionTime On
Distance		Time On
Time
San Francisco Bay Heavy481.91.2451
San Francisco Bay Medium555.81.0795
Predominantly Reaching440.11.3634
Predominantly Reaching Low526.31.1400
Predominantly Reaching Medium436.01.3761
Predominantly Reaching High391.11.5341
Windward/Leeward 60-40 Low736.90.8142
Windward/Leeward 60-40 Medium579.11.0361
Windward/Leeward 60-40 High514.51.1661
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low795.00.7547
5-Band Low / Medium682.10.8797
5-Band Medium556.31.0786
5-Band Medium / High500.51.1989
5-Band High474.21.2654
ORC Ref  04560002M5EIssued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

International
Certificate
2023

Boat

Blackwatch

USA71

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassCustomMeasurement06/05/2022HINPlan reviewHull constructionSolidCarbon RudderNoLight stanchionsNoTrim tabNo
LOA20.684Max. Beam4.432Draft3.831Displacement33,167Wetted area72.66IMS L14.928LSM014.455Acc. length14.404Sink (kg/mm) 42.64
VCGD-0.626VCGM-0.583RM Rated (kg·m) 681.1Limit of positive stability(°) 148.3Stability Index162.5
Centerboard weight120.6
PROPELLER
Propeller TypeFolding 3 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.610PBW0.158PIPA0.0057
PSD0.037PHD0.079PHL0.116
PSA8.0°ESL0.991
ST10.027ST20.198ST30.290
ST40.070ST50.259
RIG
Forestay tensionFixedInner stayFixedCarbon mastNoHeadsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoRunners/Checkstays1Spreaders2Rotating mastNo
P21.865IG23.585ISP23.845MDT10.245MDL10.382MDT20.184MDL20.251TL11.750MW0.251GO0.291
E8.600J8.005BAS1.690FSD0.012SFJ0.000SPL8.250WPLTPSBD0.211MWT933.70MCG6.801
PY9.930MDT1Y0.137MDL1Y0.162MDT2Y0.082MDL2Y0.098TLY5.593BASY1.480EY3.917BDY0.132IYEB9.710
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodPoles incliningFlotation Date06/05/2022MeasurerComment
SFFP1.423FFM1.702FF1.683LCFcl10.907SG1.0230
SAFP18.898FAM1.044FA1.073LCFsh11.140HBI1.368
W1249.0W2249.0W3249.0W4249.0
PD1515.9PD2515.9PD3515.9PD4515.9
WD18.085PLM9000.00GSA1.0RSA1.0RM687.4
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
TANKSIdDescriptionSp.WghtCapacityConditionLCGVCG1Fuel Rigid Al. Cockpit CL0.900024624616.750.15Total deductible22116.750.15
Total deductible
ORC Ref  04560002M5EIssued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

International
Certificate
2023

Boat

Blackwatch

USA71

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment853060.191.632.965.146.90106.1720/05/2019
MIZZEN
IdMHBMUWMTWMHWMQWAreaMeas.DateComment813550.070.801.482.483.2122.7817/05/2016
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentLT#10.081.603.176.349.5412.6823.77NoNo 151.0117/05/2016
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateCommentSym24.0224.0224.0215.2014.20300.2517/11/2009
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateCommentA225.5322.9924.2615.2313.60112%301.3115/07/2020
MIZZEN STAYSAIL
IdYSHFYSHWYSFLAreaMeas.DateComment813536.689.6911.0650.8317/05/2019
ORC Ref  04560002M5EIssued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org