Double HandedClub Certificate2025
Don QuixoteNOR 3571
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 Angles41.7°41.7°40.3°39.6°39.4°39.6°39.7°40.4°42.6°
Beat VMG2.643.524.104.364.454.494.524.494.29
52°4.015.266.006.306.426.486.536.566.49
60°4.235.496.206.506.626.696.756.806.78
75°4.385.656.356.696.866.967.057.167.19
90°4.285.576.326.736.997.167.297.487.61
110°3.965.336.286.797.127.377.537.807.95
120°3.785.146.136.717.097.417.718.168.51
135°3.314.605.646.406.877.247.598.389.57
150°2.723.894.955.846.496.917.278.009.05
Run VMG2.353.374.295.095.806.356.787.458.16
Gybe Angles146.2°146.2°151.6°155.0°162.8°170.0°177.7°178.1°176.6°
APH ToD:605.4CDL: 7.435APH ToT: 0.9912CertNo:7313
BOAT
ClassX-102 Mk IDesignerNielsJeppesenBuilderNordsø VærftAge date01/1981Series date01/1981Offset fileH099.BOFData file7313
HULL
Length Overall9.990 mMaximum Beam3.346 mDraft1.888 mDisplacement3,846 kgDLR8.2260IMS DivisionCruiser/RacerDynamic Allowance0.030%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeFolding 2 bladesDiameter0.380m
CREW
Maximum weight170 kg(default)Minimum weight120 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail34.2635.09Headsail Luffed30.5530.55Headsail FlyingSymmetric60.1560.15Asymmetric
STORM SAIL AREAS (m²)
Trysail9.68Storm Jib6.68Heavy Weather Jib18.01
SAIL LIMITS
Headsails5Spinnakers4
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.
Double HandedClub Certificate2025
Don QuixoteNOR 3571
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 VMG1364.91022.5878.1826.4808.4801.2796.8802.0838.6
52°897.4684.9600.3571.2560.8555.3551.1548.4555.1
60°851.4656.0580.6553.5543.5537.9533.3529.3531.2
75°821.8637.4567.4538.5524.4516.9510.9503.0500.7
90°841.1646.7569.5534.9515.3502.5493.6481.0473.2
110°908.3674.8573.2530.2505.6488.4477.9461.4452.9
120°952.7700.4587.5536.6507.6485.6466.9441.3423.2
135°1088.9783.0638.2562.6524.1497.3474.2429.5376.3
150°1325.9924.5727.4616.4554.8520.7495.3449.9397.9
Run VMG1533.71067.5838.9707.2620.8566.9531.2483.4441.2
Selected Courses
Windward / Leeward1446.51045.0858.5766.8714.6684.0664.0642.7639.9
All purpose1095.3808.0679.5619.8588.4569.7556.5538.9530.4
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward741.20.8095
All purpose605.40.9912
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.7076
Downwind "popa"0.8721
70% up, 30% down "Ilhabela"0.7501
30% up, 70% down "Ilhabela-inverso"0.8153
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Predominantly Upwind654.50.9167
Predominantly Downwind608.40.9862
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low743.80.8067
Triple Number AP Medium601.80.9970
Triple Number AP High553.21.0846
Triple Number Windward/Leeward Low992.30.6046
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Single Number Predominant Upwind676.70.8867
Single Number Predominant Reaching597.11.0049
Single Number Predominant Downwind634.20.9461
Predominant Upwind - Low868.90.6905
Predominant Upwind - Low/Med696.90.8609
Predominant Upwind - Medium639.80.9378
Predominant Upwind - Med/High612.90.9789
Predominant Upwind - High603.50.9942
Predominant Downwind Low906.50.6619
Predominant Downwind Low/Med682.90.8786
Predominant Downwind Medium589.61.0177
Predominant Downwind Med/High532.11.1277
Predominant Downwind High497.91.2050
Predominant Reaching Low792.40.7572
Predominant Reaching Low/Med626.10.9583
Predominant Reaching Medium563.71.0644
Predominant Reaching Med/High527.21.1380
Predominant Reaching High505.31.1874
SA/DSPL Upwind26.29SA/DSPL Downwind38.29
Scoring OptionTODTOT
5-Band Windward/Leeward Low1099.40.5457
5-Band Windward/Leeward Low/Med832.40.7208
5-Band Windward/Leeward Medium725.90.8265
5-Band Windward/Leeward Med/High668.10.8981
5-Band Windward/Leeward High645.90.9289
Windward/Leeward 60-40 Low1094.00.5485
Windward/Leeward 60-40 Low/Med840.10.7142
Windward/Leeward 60-40 Medium743.80.8067
Windward/Leeward 60-40 Med/High694.40.8641
Windward/Leeward 60-40 High678.20.8847
5-Band AP Low818.60.7329
5-Band AP Low/Med663.90.9037
5-Band AP Medium595.41.0078
5-Band AP Med/High558.41.0744
5-Band AP High540.51.1102
5-Band SF Bay Tour - Low950.70.6311
5-Band SF Bay Tour - Low/Med797.00.7528
5-Band SF Bay Tour - Medium704.50.8517
5-Band SF Bay Tour - Med/High655.80.9149
5-Band SF Bay Tour - High636.00.9434
Chicago-Mac Upwind0.8661
Chicago-Mac All Purpose0.8931
Chicago-Mac Downwind0.9143
Bayview-Mac Cove Island0.6742
Bayview-Mac Shore0.6803
Harvest Moon Regatta526.21.1403
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance656.8
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating656.80.9135
FinRating, kevyt tuuli1080.20.9258
FinRating, kova tuuli543.70.9197
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.9136
Triple Number Coastal/Long Distance Low0.8067
Triple Number Coastal/Long Distance Medium0.9971
Triple Number Coastal/Long Distance High1.0846
Triple Number Windward/Leeward Low0.6304
Triple Number Windward/Leeward Medium0.8148
Triple Number Windward/Leeward High0.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
For information
General Purpose Handicap (GPH)671.6
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low743.8
Triple Number Coastal/Long Distance Medium601.7
Triple Number Coastal/Long Distance High553.2
Triple Number Windward/Leeward Low951.8
Triple Number Windward/Leeward Medium736.4
Triple Number Windward/Leeward High661.0
Predominantly Upwind654.5
Predominantly Downwind608.4
Predominantly Reaching585.4
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8067
Triple Number Coastal/Long Distance Medium0.9971
Triple Number Coastal/Long Distance High1.0846
Triple Number Windward/Leeward Low0.6304
Triple Number Windward/Leeward Medium0.8148
Triple Number Windward/Leeward High0.9077
Coastal/Long Distance0.9136
Predominantly Upwind0.9167
Predominantly Downwind0.9862
For information
General Purpose Handicap (GPH)671.6
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.9912
Distanseseilas Trippeltall svak vind0.8067
Distanseseilas Trippeltall mellomvind0.9971
Distanseseilas Trippeltall sterk vind1.0846
Pølsebane Trippeltall svak vind0.6304
Pølsebane Trippeltall mellomvind0.8148
Pølsebane Trippeltall sterk vind0.9077
Motvind Singeltall0.9167
Medvind Singeltall0.9862
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Coastal/Long Distance656.80.9136
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind654.50.9167
Predominantly Downwind608.40.9862
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore640.80.9364
Cape Doctor Coastal533.01.1258
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8067
Triple Number Coastal/Long Distance Medium0.9971
Triple Number Coastal/Long Distance High1.0846
Triple Number Windward/Leeward Low0.6304
Triple Number Windward/Leeward Medium0.8148
Triple Number Windward/Leeward High0.9077
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.8067
Triple Number Coastal/Long Distance Medium0.9971
Triple Number Coastal/Long Distance High1.0846
Triple Number Windward/Leeward Low0.6304
Triple Number Windward/Leeward Medium0.8148
Triple Number Windward/Leeward High0.9077
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Predominantly Upwind654.50.9167
Predominantly Downwind608.40.9862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance656.80.9136
Triple Number Coastal/Long Distance Low743.80.8067
Triple Number Coastal/Long Distance Medium601.70.9971
Triple Number Coastal/Long Distance High553.21.0846
Triple Number Windward/Leeward Low951.80.6304
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1541.41047.2810.1694.5628.1591.2560.9512.4501.0
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low743.80.8067
Triple Number AP Medium601.80.9970
Triple Number AP High553.21.0846
Triple Number Windward/Leeward Low992.30.6046
Triple Number Windward/Leeward Medium736.40.8148
Triple Number Windward/Leeward High661.00.9077
Single Number Predominant Upwind676.70.8867
Single Number Predominant Reaching597.11.0049
Single Number Predominant Downwind634.20.9461
Predominant Upwind - Low868.90.6905
Predominant Upwind - Low/Med696.90.8609
Predominant Upwind - Medium639.80.9378
Predominant Upwind - Med/High612.90.9789
Predominant Upwind - High603.50.9942
Predominant Downwind Low906.50.6619
Predominant Downwind Low/Med682.90.8786
Predominant Downwind Medium589.61.0177
Predominant Downwind Med/High532.11.1277
Predominant Downwind High497.91.2050
Predominant Reaching Low792.40.7572
Predominant Reaching Low/Med626.10.9583
Predominant Reaching Medium563.71.0644
Predominant Reaching Med/High527.21.1380
Predominant Reaching High505.31.1874
SA/DSPL Upwind26.29SA/DSPL Downwind38.29
Scoring OptionTODTOT
5-Band Windward/Leeward Low1099.40.5457
5-Band Windward/Leeward Low/Med832.40.7208
5-Band Windward/Leeward Medium725.90.8265
5-Band Windward/Leeward Med/High668.10.8981
5-Band Windward/Leeward High645.90.9289
Windward/Leeward 60-40 Low1094.00.5485
Windward/Leeward 60-40 Low/Med840.10.7142
Windward/Leeward 60-40 Medium743.80.8067
Windward/Leeward 60-40 Med/High694.40.8641
Windward/Leeward 60-40 High678.20.8847
5-Band AP Low818.60.7329
5-Band AP Low/Med663.90.9037
5-Band AP Medium595.41.0078
5-Band AP Med/High558.41.0744
5-Band AP High540.51.1102
5-Band SF Bay Tour - Low950.70.6311
5-Band SF Bay Tour - Low/Med797.00.7528
5-Band SF Bay Tour - Medium704.50.8517
5-Band SF Bay Tour - Med/High655.80.9149
5-Band SF Bay Tour - High636.00.9434
Chicago-Mac Upwind0.8661
Chicago-Mac All Purpose0.8931
Chicago-Mac Downwind0.9143
Bayview-Mac Cove Island0.6742
Bayview-Mac Shore0.6803
Harvest Moon Regatta526.21.1403
Double HandedClub Certificate2025
Don QuixoteNOR 3571
Norges Seilforbund
Sognsveien 73
0854 OSLO
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassX-102 Mk IMeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA9.990Max. Beam3.346Draft1.888Displacement3,846Wetted area19.79IMS L8.047LSM07.761Acc. length9.979Sink (kg/mm) 14.24
VCGD0.000VCGM0.063RM Rated (kg·m) 78.0Limit of positive stability(°) N/AStability IndexN/ADefault crew weight170Declared crew weightN/A
PROPELLER
Propeller TypeFolding 2 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.380PBWPIPA0.0057
PSD0.030PHD0.080PHL0.160
PSA16.0°ESL0.670
ST10.030ST20.100ST30.100
ST40.100ST50.100
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders2Rotating mastNo
P12.740IG11.550ISP11.550MDT10.100MDL10.150MDT20.080MDL20.080TL2.780MW0.150GO0.150
E4.340J3.370BAS1.650FSD0.030SFJ0.000SPL3.440WPLTPS0.000BD0.000MWT109.00MCG4.300
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered0.000Flotation Date01/01/2015
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Double HandedClub Certificate2025
Don QuixoteNOR 3571
Norges Seilforbund
Sognsveien 73
0854 OSLO
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment417-2010021513530.160.001.782.913.7634.2615/02/2010
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment7313-2004012412010.000.000.000.000.004.9412.15NoNo 30.5501/01/1753
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment306-20090115165411.6311.6311.636.210.0060.1515/01/2009S 2,5 2009
CRUISER/RACER REQUIREMENTS*
Accommodation length10.0 mTable area0.44 m²Headroom1.70 mMinimum number of berths4Personal gear stowage0.16 m³Fresh water capacity80 lMinimum number of seats in cockpit4Food stowage0.24 m³Fuel capacity50 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.