Club
Certificate
2023

Boat

Lethe

NOR 12488

Norges Seilforbund
Sognsveien 73
0854 OSLO
Rated boat velocities in knots
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Beat Angles43.0°40.8°39.4°38.8°38.4°38.4°39.9°
Beat VMG3.424.134.614.834.924.964.94
52°5.206.106.636.896.997.057.09
60°5.476.336.817.077.207.277.33
75°5.766.637.047.247.457.607.74
90°5.986.827.267.567.767.908.14
110°5.816.817.327.707.988.318.89
120°5.666.717.277.718.128.509.06
135°5.116.276.997.467.908.359.48
150°4.355.466.376.947.287.588.24
Run VMG3.764.735.516.016.356.867.55
Gybe Angles144.4°147.8°149.2°150.1°169.4°175.4°176.3°

APH: 565.9

CDL: 8.532

GPH: 630.7

CertNo: 9836

BOAT
ClassFirst 34.7DesignerB.FarrBuilderBeneteauAge date01/2008Series date01/2004Offset fileFIRST347.offData file9836
HULL
Length Overall9.980 mMaximum Beam3.372 mDraft1.992 mDisplacement4,491 kgDLR6.6185IMS DivisionCruiser/RacerDynamic Allowance0.150%Age Allowance0.487%
PROPELLER
InstallationStrutTypeFolding 2 bladesDiameter0.380m
CREW
Maximum weight500 kgMinimum weight375 kg * when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail34.8235.58Headsail Luffed26.3926.39Headsail FlyingSymmetricAsymmetric99.3699.36 (1 asymmetric(s) with SHW/SFL < 85%)
STORM SAIL AREAS (m²)
Trysail10.06Storm Jib8.68Heavy Weather Jib23.42
SAIL LIMITS
Headsails5  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  03440002ID3Issued on 19/04/2023Valid until 31/03/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

Lethe

NOR 12488

Norges Seilforbund
Sognsveien 73
0854 OSLO
Time Allowances in secs/NM
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Beat VMG1052.5871.2781.3745.1731.4725.5728.6
52°692.5590.1542.7522.7514.7510.4507.8
60°658.5568.8528.5509.4500.1495.2491.3
75°624.7542.7511.3497.3483.2473.8464.8
90°602.1527.6495.6476.2464.0455.8442.3
110°620.1529.0491.9467.8451.0433.3404.9
120°635.6536.6495.2467.0443.5423.8397.6
135°704.4573.9514.7482.7455.7430.9379.9
150°828.5659.0565.6519.1494.6474.6436.9
Run VMG956.6760.9653.1599.3566.8525.0476.7
Selected Courses
Windward / Leeward1004.6816.1717.2672.2649.1625.3602.7
All purpose773.0642.6579.5548.6530.6516.0496.6
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward699.40.8579
All purpose565.91.0602
 
Custom scoring options for Australia
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Custom scoring options for Austria
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7453
Downwind "popa"0.9254
70% up, 30% down "Ilhabela"0.7915
30% up, 70% down "Ilhabela-inverso"0.8629
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Predominantly Upwind614.20.9769
Predominantly Downwind567.81.0566
Custom scoring options for Canada
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low707.80.8477
Triple Number All Purpose Medium562.21.0672
Triple Number All Purpose High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Predominantly Upwind614.20.9769
Predominantly Downwind567.81.0566
Predominantly Upwind Low797.50.7524
Predominantly Upwind Medium637.50.9411
Predominantly Upwind High604.50.9925
Predominantly Downwind Low761.40.7880
Predominantly Downwind Medium563.51.0648
Predominantly Downwind High482.61.2433
Chicago-Mac Upwind0.9604
Chicago-Mac All Purpose0.9979
Chicago-Mac Downwind1.0404
Bayview-Mac Cove Island0.9337
Bayview-Mac Shore0.9377
Scoring OptionTime On
Distance		Time On
Time
Predominantly Reaching532.91.1260
Predominantly Reaching Low635.50.9441
Predominantly Reaching Medium526.91.1388
Predominantly Reaching High471.91.2714
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low990.00.6060
5-Band Low / Medium836.70.7171
5-Band Medium683.90.8774
5-Band Medium / High629.50.9531
5-Band High606.60.9892
Custom scoring options for Cyprus
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Denmark
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance614.8
Triple Number Coastal/Long Distance Low707.8
Triple Number Coastal/Long Distance Medium562.2
Triple Number Coastal/Long Distance High512.4
Triple Number Windward/Leeward Low910.3
Triple Number Windward/Leeward Medium693.4
Triple Number Windward/Leeward High622.7
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Estonia
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Finland
Scoring OptionTime On
Distance		Time On
Time
FinRating (Coastal/Long Distance)614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for France
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Custom scoring options for Germany
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8477
Triple Number Coastal/Long Distance Medium1.0672
Triple Number Coastal/Long Distance High1.1710
Triple Number Windward/Leeward Low0.6591
Triple Number Windward/Leeward Medium0.8653
Triple Number Windward/Leeward High0.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Greece
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Hungary
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Custom scoring options for Israel
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Japan
Scoring OptionTime On
Distance		Time On
Time
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low707.8
Triple Number Coastal/Long Distance Medium562.2
Triple Number Coastal/Long Distance High512.4
Triple Number Windward/Leeward Low910.3
Triple Number Windward/Leeward Medium693.4
Triple Number Windward/Leeward High622.7
Predominantly Upwind614.2
Predominantly Downwind567.8
Predominantly Reaching544.1
Custom scoring options for Lithuania
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8477
Triple Number Coastal/Long Distance Medium1.0672
Triple Number Coastal/Long Distance High1.1710
Triple Number Windward/Leeward Low0.6591
Triple Number Windward/Leeward Medium0.8653
Triple Number Windward/Leeward High0.9635
Coastal/Long Distance0.9760
Predominantly Upwind0.9769
Predominantly Downwind1.0566
Custom scoring options for Norway
Scoring OptionTime On
Time
Tretall Distanseseilas Lite vind0.8477
Tretall Distanseseilas Mellomvind1.0672
Tretall Distanseseilas Mye vind1.1710
Tretall Pølsebane Lite vind0.6591
Tretall Pølsebane Mellomvind0.8653
Tretall Pølsebane Mye vind0.9635
Distanseseilas ett tall (OSN 8-16kn)0.9760
Distanseseilas ett tall (APH 6-20kn)1.0602
Enkeltall Motvind0.9769
Enkeltall Medvind1.0566
Custom scoring options for Portugal
Scoring OptionTime On
Distance		Time On
Time
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Coastal/Long Distance614.80.9760
Custom scoring options for Russia
Scoring OptionTime On
Distance		Time On
Time
Predominantly Upwind614.20.9769
Predominantly Downwind567.81.0566
Custom scoring options for South Africa
Scoring OptionTime On
Distance		Time On
Time
Cape Doctor Inshore609.40.9845
Cape Doctor Coastal502.41.1942
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8477
Triple Number Coastal/Long Distance Medium1.0672
Triple Number Coastal/Long Distance High1.1710
Triple Number Windward/Leeward Low0.6591
Triple Number Windward/Leeward Medium0.8653
Triple Number Windward/Leeward High0.9635
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8477
Triple Number Coastal/Long Distance Medium1.0672
Triple Number Coastal/Long Distance High1.1710
Triple Number Windward/Leeward Low0.6591
Triple Number Windward/Leeward Medium0.8653
Triple Number Windward/Leeward High0.9635
Custom scoring options for Sweden
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Predominantly Upwind614.20.9769
Predominantly Downwind567.81.0566
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for Ukraine
Scoring OptionTime On
Distance		Time On
Time
Coastal/Long Distance614.80.9760
Triple Number Coastal/Long Distance Low707.80.8477
Triple Number Coastal/Long Distance Medium562.21.0672
Triple Number Coastal/Long Distance High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Performance Curve6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt
Coastal/Long Distance999.8767.5649.1585.3551.0521.0474.9
Custom scoring options for United States of America
Scoring OptionTime On
Distance		Time On
Time
Triple Number All Purpose Low707.80.8477
Triple Number All Purpose Medium562.21.0672
Triple Number All Purpose High512.41.1710
Triple Number Windward/Leeward Low910.30.6591
Triple Number Windward/Leeward Medium693.40.8653
Triple Number Windward/Leeward High622.70.9635
Predominantly Upwind614.20.9769
Predominantly Downwind567.81.0566
Predominantly Upwind Low797.50.7524
Predominantly Upwind Medium637.50.9411
Predominantly Upwind High604.50.9925
Predominantly Downwind Low761.40.7880
Predominantly Downwind Medium563.51.0648
Predominantly Downwind High482.61.2433
Chicago-Mac Upwind0.9604
Chicago-Mac All Purpose0.9979
Chicago-Mac Downwind1.0404
Bayview-Mac Cove Island0.9337
Bayview-Mac Shore0.9377
Harvest Moon Regatta492.01.2194
Scoring OptionTime On
Distance		Time On
Time
San Francisco Bay Heavy605.60.9908
San Francisco Bay Medium682.20.8796
Predominantly Reaching532.91.1260
Predominantly Reaching Low635.50.9441
Predominantly Reaching Medium526.91.1388
Predominantly Reaching High471.91.2714
Windward/Leeward 60-40 Low920.60.6517
Windward/Leeward 60-40 Medium717.50.8362
Windward/Leeward 60-40 High658.60.9110
5-Band
Windward/Leeward		Time On
Distance		Time On
Time
5-Band Low990.00.6060
5-Band Low / Medium836.70.7171
5-Band Medium683.90.8774
5-Band Medium / High629.50.9531
5-Band High606.60.9892
ORC Ref  03440002ID3Issued on 19/04/2023Valid until 31/03/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

Lethe

NOR 12488

Norges Seilforbund
Sognsveien 73
0854 OSLO
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassFirst 34.7MeasurementHINPlan reviewHull constructionSolidCarbon RudderNoLight stanchionsNoTrim tabNo
LOA9.980Max. Beam3.372Draft1.992Displacement4,491Wetted area21.90IMS L9.031LSM08.786Acc. length9.982Sink (kg/mm) 16.29
VCGD-0.110VCGM-0.088RM Rated (kg·m) 101.1Limit of positive stability(°) N/AStability IndexN/A
PROPELLER
Propeller TypeFolding 2 blades
InstallationStrutTwin screwNoHydro generatorNo
PRD0.380PBWPIPA0.0034
EDL1.780ST10.050ST20.170
ST30.170ST40.170ST50.270
RIG
Forestay tensionAftInner stayNone FittedCarbon mastYesHeadsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoRunners/Checkstays0Spreaders2Rotating mastNo
P12.800IG13.170ISP13.900MDT10.100MDL10.180MDT20.100MDL20.150TL1.200MW0.150GO0.150
E4.490J3.670BAS1.540FSDFoilSFJ0.000SPL0.000WPLTPS5.100BDMWT110.00MCG4.780
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered-0.110Flotation Date01/01/2015MeasurerComment
SFFP0.172FFMFF1.304LCFcl5.369SG1.0140
SAFP9.530FAMFA1.052LCFsh5.611HBI1.169
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
ORC Ref  03440002ID3Issued on 19/04/2023Valid until 31/03/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org

Club
Certificate
2023

Boat

Lethe

NOR 12488

Norges Seilforbund
Sognsveien 73
0854 OSLO
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment336-2022022510570.321.061.782.933.7634.8225/02/2022
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment336-2022022511010.090.631.142.062.913.7813.19NoNo 26.3925/02/2022306-2018012309030.080.561.071.972.853.7312.93NoNo 25.0723/01/20183 medium306-2019091112090.100.470.921.772.603.4012.30NoNo 21.5211/09/20193Di 360 RAW336-2022080114030.090.400.731.472.343.3011.33NoNo 17.7501/08/2022
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateComment306-20230415124715.5013.1014.308.408.09104%99.3615/04/2023A2 2023306-20170808130415.2212.4213.828.187.58108%92.8208/08/20171-20170810122915.0212.4913.767.516.69112%84.2010/08/2017Mål fra 1Sails sverige336-20220309124113.8712.0712.975.367.0576%61.5909/03/2022
ORC Ref  03440002ID3Issued on 19/04/2023Valid until 31/03/2024
VPP ver: 2023 1.02 | © ORC | www.orc.org