Non Spin/HSFClub Certificate2025
DuppenNOR 10750
Norges Seilforbund
Sognsveien 73
0854 OSLO
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 Angles43.2°43.2°40.9°39.4°38.2°37.7°37.4°37.6°38.4°
Beat VMG2.343.223.904.384.664.784.854.884.82
52°3.644.895.776.286.556.686.756.806.81
60°3.855.135.996.446.706.856.937.007.02
75°3.965.286.146.576.837.037.187.347.42
90°3.845.166.066.566.857.087.297.617.80
110°3.334.625.646.356.767.057.327.838.29
120°3.124.365.396.176.646.957.227.778.35
135°2.653.824.855.696.326.716.997.538.11
150°2.193.254.255.105.836.386.747.277.79
Run VMG1.902.813.694.485.195.846.356.977.47
Gybe Angles148.0°148.0°153.0°160.9°169.4°174.5°179.0°179.5°179.5°
APH ToD:628.7CDL: 8.000APH ToT: 0.9544CertNo:8279
BOAT
ClassELAN 31DesignerRobHuphreyBuilderElan marineAge date01/2004Series date01/2003Offset fileELAN31.OFFData file8279
HULL
Length Overall9.150 mMaximum Beam3.302 mDraft1.911 mDisplacement4,332 kgDLR7.1424IMS DivisionCruiser/RacerDynamic Allowance0.330%Age Allowance0.487%
PROPELLER
InstallationStrutTypeFolding 2 bladesDiameter0.340m
CREW
Maximum weight543 kg(default)Minimum weight413 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail28.2328.76Headsail Luffed25.2125.21Headsail FlyingSymmetricAsymmetric
STORM SAIL AREAS (m²)
Trysail8.59Storm Jib6.83Heavy Weather Jib18.44
SAIL LIMITS
Headsails5
✱ Zero set flying
Spinnakers0
✱ 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.
Non Spin/HSFClub Certificate2025
DuppenNOR 10750
Norges Seilforbund
Sognsveien 73
0854 OSLO
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 VMG1535.71117.3922.7822.2771.9752.4742.7738.2746.9
52°989.6736.1624.4573.2549.7538.6533.5529.1529.0
60°935.8701.3601.0558.7537.6525.8519.7514.1512.5
75°908.0682.2586.7547.7526.8512.1501.6490.7485.3
90°936.6697.7593.7548.5525.4508.4493.9472.9461.7
110°1079.8779.6638.4566.6532.7510.7491.9459.5434.3
120°1155.3826.0668.2583.4542.4518.3498.6463.2431.2
135°1357.3943.1741.6632.5569.6536.6514.8478.2444.0
150°1641.81107.7846.5705.4617.5564.4534.5495.5461.9
Run VMG1895.31279.0975.0803.6693.1616.8567.0516.4481.8
Selected Courses
Windward / Leeward1711.71198.2948.9812.9732.5684.6654.9627.3614.4
All purpose1281.7915.9742.4652.6602.9574.5556.4534.4520.4
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward770.90.7783
All purpose628.70.9544
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7158
Downwind "popa"0.7705
70% up, 30% down "Ilhabela"0.7314
30% up, 70% down "Ilhabela-inverso"0.7532
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Predominantly Upwind665.30.9018
Predominantly Downwind657.50.9126
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low829.20.7236
Triple Number AP Medium624.10.9614
Triple Number AP High552.61.0857
Triple Number Windward/Leeward Low1124.10.5337
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Single Number Predominant Upwind692.70.8662
Single Number Predominant Reaching631.50.9502
Single Number Predominant Downwind692.50.8664
Predominant Upwind - Low965.60.6213
Predominant Upwind - Low/Med732.70.8189
Predominant Upwind - Medium641.80.9349
Predominant Upwind - Med/High598.01.0034
Predominant Upwind - High582.51.0301
Predominant Downwind Low1061.50.5653
Predominant Downwind Low/Med760.40.7890
Predominant Downwind Medium630.00.9523
Predominant Downwind Med/High553.41.0842
Predominant Downwind High517.61.1592
Predominant Reaching Low898.20.6680
Predominant Reaching Low/Med674.60.8894
Predominant Reaching Medium584.91.0258
Predominant Reaching Med/High535.21.1211
Predominant Reaching High510.51.1753
SA/DSPL Upwind20.01SA/DSPL Downwind20.01
Scoring OptionTODTOT
5-Band Windward/Leeward Low1265.20.4742
5-Band Windward/Leeward Low/Med905.70.6625
5-Band Windward/Leeward Medium749.40.8006
5-Band Windward/Leeward Med/High661.80.9066
5-Band Windward/Leeward High629.80.9526
Windward/Leeward 60-40 Low1246.80.4812
Windward/Leeward 60-40 Low/Med903.30.6642
Windward/Leeward 60-40 Medium757.00.7926
Windward/Leeward 60-40 Med/High678.60.8841
Windward/Leeward 60-40 High652.00.9203
5-Band AP Low934.30.6422
5-Band AP Low/Med715.70.8383
5-Band AP Medium614.10.9770
5-Band AP Med/High559.61.0721
5-Band AP High535.81.1199
5-Band SF Bay Tour - Low1078.60.5563
5-Band SF Bay Tour - Low/Med863.10.6952
5-Band SF Bay Tour - Medium723.30.8295
5-Band SF Bay Tour - Med/High648.90.9247
5-Band SF Bay Tour - High621.30.9657
Chicago-Mac Upwind0.8390
Chicago-Mac All Purpose0.8399
Chicago-Mac Downwind0.8314
Bayview-Mac Cove Island0.6011
Bayview-Mac Shore0.6082
Harvest Moon Regatta549.91.0912
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance685.8
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating685.80.8749
FinRating, kevyt tuuli1247.80.8014
FinRating, kova tuuli540.10.9257
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.8749
Triple Number Coastal/Long Distance Low0.7236
Triple Number Coastal/Long Distance Medium0.9616
Triple Number Coastal/Long Distance High1.0857
Triple Number Windward/Leeward Low0.5589
Triple Number Windward/Leeward Medium0.7840
Triple Number Windward/Leeward High0.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
For information
General Purpose Handicap (GPH)710.1
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low829.2
Triple Number Coastal/Long Distance Medium624.0
Triple Number Coastal/Long Distance High552.6
Triple Number Windward/Leeward Low1073.5
Triple Number Windward/Leeward Medium765.3
Triple Number Windward/Leeward High652.0
Predominantly Upwind665.3
Predominantly Downwind657.5
Predominantly Reaching621.7
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7236
Triple Number Coastal/Long Distance Medium0.9616
Triple Number Coastal/Long Distance High1.0857
Triple Number Windward/Leeward Low0.5589
Triple Number Windward/Leeward Medium0.7840
Triple Number Windward/Leeward High0.9203
Coastal/Long Distance0.8749
Predominantly Upwind0.9018
Predominantly Downwind0.9126
For information
General Purpose Handicap (GPH)710.1
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.9544
Distanseseilas Trippeltall svak vind0.7236
Distanseseilas Trippeltall mellomvind0.9616
Distanseseilas Trippeltall sterk vind1.0857
Pølsebane Trippeltall svak vind0.5589
Pølsebane Trippeltall mellomvind0.7840
Pølsebane Trippeltall sterk vind0.9203
Motvind Singeltall0.9018
Medvind Singeltall0.9126
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Coastal/Long Distance685.80.8749
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind665.30.9018
Predominantly Downwind657.50.9126
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore618.20.9705
Cape Doctor Coastal524.61.1438
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7236
Triple Number Coastal/Long Distance Medium0.9616
Triple Number Coastal/Long Distance High1.0857
Triple Number Windward/Leeward Low0.5589
Triple Number Windward/Leeward Medium0.7840
Triple Number Windward/Leeward High0.9203
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.7236
Triple Number Coastal/Long Distance Medium0.9616
Triple Number Coastal/Long Distance High1.0857
Triple Number Windward/Leeward Low0.5589
Triple Number Windward/Leeward Medium0.7840
Triple Number Windward/Leeward High0.9203
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Predominantly Upwind665.30.9018
Predominantly Downwind657.50.9126
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance685.80.8749
Triple Number Coastal/Long Distance Low829.20.7236
Triple Number Coastal/Long Distance Medium624.00.9616
Triple Number Coastal/Long Distance High552.61.0857
Triple Number Windward/Leeward Low1073.50.5589
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1851.51206.3894.6734.6642.7596.1563.2513.9497.3
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low829.20.7236
Triple Number AP Medium624.10.9614
Triple Number AP High552.61.0857
Triple Number Windward/Leeward Low1124.10.5337
Triple Number Windward/Leeward Medium765.30.7840
Triple Number Windward/Leeward High652.00.9203
Single Number Predominant Upwind692.70.8662
Single Number Predominant Reaching631.50.9502
Single Number Predominant Downwind692.50.8664
Predominant Upwind - Low965.60.6213
Predominant Upwind - Low/Med732.70.8189
Predominant Upwind - Medium641.80.9349
Predominant Upwind - Med/High598.01.0034
Predominant Upwind - High582.51.0301
Predominant Downwind Low1061.50.5653
Predominant Downwind Low/Med760.40.7890
Predominant Downwind Medium630.00.9523
Predominant Downwind Med/High553.41.0842
Predominant Downwind High517.61.1592
Predominant Reaching Low898.20.6680
Predominant Reaching Low/Med674.60.8894
Predominant Reaching Medium584.91.0258
Predominant Reaching Med/High535.21.1211
Predominant Reaching High510.51.1753
SA/DSPL Upwind20.01SA/DSPL Downwind20.01
Scoring OptionTODTOT
5-Band Windward/Leeward Low1265.20.4742
5-Band Windward/Leeward Low/Med905.70.6625
5-Band Windward/Leeward Medium749.40.8006
5-Band Windward/Leeward Med/High661.80.9066
5-Band Windward/Leeward High629.80.9526
Windward/Leeward 60-40 Low1246.80.4812
Windward/Leeward 60-40 Low/Med903.30.6642
Windward/Leeward 60-40 Medium757.00.7926
Windward/Leeward 60-40 Med/High678.60.8841
Windward/Leeward 60-40 High652.00.9203
5-Band AP Low934.30.6422
5-Band AP Low/Med715.70.8383
5-Band AP Medium614.10.9770
5-Band AP Med/High559.61.0721
5-Band AP High535.81.1199
5-Band SF Bay Tour - Low1078.60.5563
5-Band SF Bay Tour - Low/Med863.10.6952
5-Band SF Bay Tour - Medium723.30.8295
5-Band SF Bay Tour - Med/High648.90.9247
5-Band SF Bay Tour - High621.30.9657
Chicago-Mac Upwind0.8390
Chicago-Mac All Purpose0.8399
Chicago-Mac Downwind0.8314
Bayview-Mac Cove Island0.6011
Bayview-Mac Shore0.6082
Harvest Moon Regatta549.91.0912
Non Spin/HSFClub Certificate2025
DuppenNOR 10750
Norges Seilforbund
Sognsveien 73
0854 OSLO
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassELAN 31MeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA9.150Max. Beam3.302Draft1.911Displacement4,332Wetted area19.99IMS L8.515LSM08.464Acc. length9.470Sink (kg/mm) 15.07
VCGD0.137VCGM0.076RM Rated (kg·m) 71.4Limit of positive stability(°) N/AStability IndexN/ADefault crew weight543Declared crew weightN/A
PROPELLER
Propeller TypeFolding 2 blades
InstallationStrutTwin screwNoHydro generatorNo
PRD0.340PBWPIPA0.0033
EDL1.980ST10.045ST20.170
ST30.170ST40.170ST50.280
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders2Rotating mastNo
P11.460IG11.685ISP11.750MDT10.090MDL10.160MDT20.087MDL20.110TL0.000MW0.160GO0.160
E4.280J3.280BAS1.507FSDFoilSFJ0.000SPL3.350WPLTPS0.000BD0.000MWT111.20MCG3.870
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered0.137Flotation Date01/01/2015
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Non Spin/HSFClub Certificate2025
DuppenNOR 10750
Norges Seilforbund
Sognsveien 73
0854 OSLO
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment267-2016060214050.140.861.532.633.4728.2302/06/2016
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment626-2019102109340.040.551.082.273.544.8310.78NoNo 25.2121/10/2019999-2005042913510.000.000.000.000.004.4610.87NoNo 24.6829/04/2005417-2019091211180.040.541.022.083.214.4010.82NoNo 23.1612/09/2019
CRUISER/RACER REQUIREMENTS*
Accommodation length9.5 mTable area0.44 m²Headroom1.67 mMinimum number of berths4Personal gear stowage0.16 m³Fresh water capacity70 lMinimum number of seats in cockpit4Food stowage0.24 m³Fuel capacity40 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.