Club
Certificate
2023

Boat

Back Bay

USA 8939

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 Angles43.0°41.2°39.6°38.8°38.2°37.8°37.6°
Beat VMG3.504.214.704.965.095.165.22
52°5.316.226.767.037.157.237.29
60°5.576.446.937.197.347.417.49
75°5.726.577.057.337.537.677.82
90°5.596.507.087.377.597.798.09
110°5.546.637.247.607.898.138.43
120°5.386.507.177.577.918.228.76
135°4.886.016.847.347.718.058.72
150°4.145.256.186.907.357.698.33
Run VMG3.584.555.376.076.657.147.81
Gybe Angles145.1°149.8°152.3°157.7°168.2°177.2°179.0°

APH: 564.2

CDL: 9.206

GPH: 631.8

CertNo: US6137

BOAT
ClassCAL 39-2 TM (1-147DesignerLAPWORTHBuilderJENSENAge date01/1979Series date01/1978Offset fileCAL39-MKII.offData fileUS6137
HULL
Length Overall11.906 mMaximum Beam3.650 mDraft2.061 mDisplacement8,462 kgDLR8.5835IMS DivisionCruiser/RacerDynamic Allowance0.310%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeFeathering 3 bladesDiameter0.366m
CREW
Maximum weight750 kgMinimum weight563 kg * when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail36.6637.17Headsail Luffed57.1857.18Headsail FlyingSymmetric124.34124.34Asymmetric124.75124.75 (All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS (m²)
Trysail10.73Storm Jib13.55Heavy Weather Jib36.58
SAIL LIMITS
Headsails5  Spinnakers4 * Asymmetric SHALL NOT be tacked on the pole
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  04560002M64Issued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

Back Bay

USA 8939

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 VMG1028.7855.3765.6725.8707.3697.4690.0
52°677.9579.2532.6512.0503.2498.2493.7
60°646.6559.2519.6500.5490.8485.7480.7
75°629.6547.8510.8490.9478.0469.5460.7
90°643.9553.7508.6488.3474.3462.2445.0
110°650.2542.8497.5473.5456.2442.8427.0
120°669.6554.1502.2475.3455.0437.9410.8
135°738.1599.2525.9490.3467.0447.4412.7
150°870.0685.4582.1522.0490.0468.2432.1
Run VMG1004.6791.4670.7593.0541.0503.9460.9
Selected Courses
Windward / Leeward1016.6823.4718.2659.4624.2600.6575.5
All purpose787.3651.1581.3544.8523.4508.7489.9
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward688.30.8717
All purpose564.21.0634
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7678
Downwind "popa"0.9199
70% up, 30% down "Ilhabela"0.8079
30% up, 70% down "Ilhabela-inverso"0.8683
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Predominantly Upwind608.40.9861
Predominantly Downwind573.21.0467
Custom scoring options for Canada
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low719.30.8342
Triple Number All Purpose Medium560.51.0705
Triple Number All Purpose High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Predominantly Upwind608.40.9861
Predominantly Downwind573.21.0467
Predominantly Upwind Low795.70.7540
Predominantly Upwind Medium626.50.9577
Predominantly Upwind High586.31.0233
Predominantly Downwind Low786.40.7630
Predominantly Downwind Medium568.11.0561
Predominantly Downwind High479.21.2521
Chicago-Mac Upwind0.9694
Chicago-Mac All Purpose0.9956
Chicago-Mac Downwind1.0289
Bayview-Mac Cove Island0.9283
Bayview-Mac Shore0.9371
Scoring OptionTime On
Distance		Time On
Time
Predominantly Reaching539.21.1127
Predominantly Reaching Low655.60.9152
Predominantly Reaching Medium533.51.1247
Predominantly Reaching High476.01.2604
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low1001.70.5990
5-Band Low / Medium842.50.7121
5-Band Medium672.00.8928
5-Band Medium / High605.30.9912
5-Band High579.81.0348
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance612.7
Triple Number Coastal/Long Distance Low719.3
Triple Number Coastal/Long Distance Medium560.5
Triple Number Coastal/Long Distance High505.3
Triple Number Windward/Leeward Low920.0
Triple Number Windward/Leeward Medium683.8
Triple Number Windward/Leeward High597.1
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating (Coastal/Long Distance)612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Custom scoring options for Germany
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8342
Triple Number Coastal/Long Distance Medium1.0705
Triple Number Coastal/Long Distance High1.1873
Triple Number Windward/Leeward Low0.6522
Triple Number Windward/Leeward Medium0.8774
Triple Number Windward/Leeward High1.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low719.3
Triple Number Coastal/Long Distance Medium560.5
Triple Number Coastal/Long Distance High505.3
Triple Number Windward/Leeward Low920.0
Triple Number Windward/Leeward Medium683.8
Triple Number Windward/Leeward High597.1
Predominantly Upwind608.4
Predominantly Downwind573.2
Predominantly Reaching551.6
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8342
Triple Number Coastal/Long Distance Medium1.0705
Triple Number Coastal/Long Distance High1.1873
Triple Number Windward/Leeward Low0.6522
Triple Number Windward/Leeward Medium0.8774
Triple Number Windward/Leeward High1.0049
Coastal/Long Distance0.9793
Predominantly Upwind0.9861
Predominantly Downwind1.0467
Custom scoring options for Norway
Scoring OptionTime On
Time
Tretall Distanseseilas Lite vind0.8342
Tretall Distanseseilas Mellomvind1.0705
Tretall Distanseseilas Mye vind1.1873
Tretall Pølsebane Lite vind0.6522
Tretall Pølsebane Mellomvind0.8774
Tretall Pølsebane Mye vind1.0049
Distanseseilas ett tall (OSN 8-16kn)0.9793
Distanseseilas ett tall (APH 6-20kn)1.0634
Enkeltall Motvind0.9861
Enkeltall Medvind1.0467
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Coastal/Long Distance612.70.9793
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind608.40.9861
Predominantly Downwind573.21.0467
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore583.01.0291
Cape Doctor Coastal495.61.2107
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8342
Triple Number Coastal/Long Distance Medium1.0705
Triple Number Coastal/Long Distance High1.1873
Triple Number Windward/Leeward Low0.6522
Triple Number Windward/Leeward Medium0.8774
Triple Number Windward/Leeward High1.0049
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8342
Triple Number Coastal/Long Distance Medium1.0705
Triple Number Coastal/Long Distance High1.1873
Triple Number Windward/Leeward Low0.6522
Triple Number Windward/Leeward Medium0.8774
Triple Number Windward/Leeward High1.0049
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Predominantly Upwind608.40.9861
Predominantly Downwind573.21.0467
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance612.70.9793
Triple Number Coastal/Long Distance Low719.30.8342
Triple Number Coastal/Long Distance Medium560.51.0705
Triple Number Coastal/Long Distance High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance1015.4776.3650.9580.2542.8514.1470.2
Custom scoring options for United States of America
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low719.30.8342
Triple Number All Purpose Medium560.51.0705
Triple Number All Purpose High505.31.1873
Triple Number Windward/Leeward Low920.00.6522
Triple Number Windward/Leeward Medium683.80.8774
Triple Number Windward/Leeward High597.11.0049
Predominantly Upwind608.40.9861
Predominantly Downwind573.21.0467
Predominantly Upwind Low795.70.7540
Predominantly Upwind Medium626.50.9577
Predominantly Upwind High586.31.0233
Predominantly Downwind Low786.40.7630
Predominantly Downwind Medium568.11.0561
Predominantly Downwind High479.21.2521
Chicago-Mac Upwind0.9694
Chicago-Mac All Purpose0.9956
Chicago-Mac Downwind1.0289
Bayview-Mac Cove Island0.9283
Bayview-Mac Shore0.9371
Harvest Moon Regatta494.81.2126
Scoring OptionTime On
Distance		Time On
Time
San Francisco Bay Heavy587.51.0213
San Francisco Bay Medium677.40.8858
Predominantly Reaching539.21.1127
Predominantly Reaching Low655.60.9152
Predominantly Reaching Medium533.51.1247
Predominantly Reaching High476.01.2604
Windward/Leeward 60-40 Low924.40.6491
Windward/Leeward 60-40 Medium704.80.8514
Windward/Leeward 60-40 High631.10.9507
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low1001.70.5990
5-Band Low / Medium842.50.7121
5-Band Medium672.00.8928
5-Band Medium / High605.30.9912
5-Band High579.81.0348
ORC Ref  04560002M64Issued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

Back Bay

USA 8939

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassCAL 39-2 TM (1-147MeasurementHINPlan reviewHull constructionSolidCarbon RudderNoLight stanchionsNoTrim tabNo
LOA11.906Max. Beam3.650Draft2.061Displacement8,462Wetted area32.20IMS L9.947LSM09.952Acc. length11.863Sink (kg/mm) 22.03
VCGD-0.022VCGM-0.014RM Rated (kg·m) 189.0Limit of positive stability(°) N/AStability IndexN/A
PROPELLER
Propeller TypeFeathering 3 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.366PBW0.128PIPA0.0043
PSD0.024PHD0.061PHL0.122
PSA17.0°ESL1.052
ST10.021ST20.091ST30.116
ST40.058ST50.155
RIG
Forestay tensionAftInner stayNone FittedCarbon mastNoHeadsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoRunners/Checkstays1Spreaders2Rotating mastNo
P14.630IG16.459ISP16.459MDT10.155MDL10.229MDT20.155MDL20.198TL1.902MW0.198GO0.198
E4.191J5.090BAS1.634FSD0.036SFJ0.000SPL5.690WPLTPS5.090BD0.149MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM estimatedFlotation Date02/03/2017MeasurerComment
SFFP0.500FFMFF1.291LCFcl6.643SG1.0230
SAFP11.415FAMFA1.061LCFsh6.882HBI1.127
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  04560002M64Issued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

Back Bay

USA 8939

US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment15720090.170.901.582.743.5136.6609/05/2017
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment15720170.040.861.743.595.587.5315.54NoNo 57.1809/05/201706-A-0029
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment157202616.3616.3616.369.129.12124.3427/03/2014
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateComment157203317.2415.1016.179.089.9791%124.75
ORC Ref  04560002M64Issued on 19/05/2023Valid until 19/02/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org