J Class
Certificate
2024
RAINBOW
J-KZ1
ORC J Class
Rating Office
orc.org/organization/jclass
jc@orc.org
BOAT
ClassJ CLASSDesignerBURGESS/DYKSTRABuilderHOLLAND JACHTBOUWOffset fileJKZ1.offData fileJKZ1
HULL
Length Overall39.924 mMaximum Beam6.430 mDynamic Allowance2.390%
MeasurementSailingDisplacement (kg)158,056164,738Draft (m)4.7504.806RM at 1° (kg·m)5932.56005.1VCGD (m)-1.229-1.145VCGM (m)-1.382-1.298
SAIL AREAS (m²)
MeasuredRatedMainsail492.02500.40Headsail Luffed422.72422.72Symmetric921.46921.46Asymmetric920.43920.43Total upwind914.74Total downwind1,413.48
SAIL LIMITS
Mainsail1Headsails luffed6Headsails inner2Spinnakers8
The owner and any other person in charge is responsible that boat is complying with her certificate in accordance with RRS 78.1 and JCA Class Rules.
ORC Ref  02920003ECIIssued on 24/09/2024Valid until 31/12/2024
VPP ver: 2024 1.00JC | © ORC | www.orc.org
J Class
Certificate
2024
RAINBOW
J-KZ1
ORC J Class
Rating Office
orc.org/organization/jclass
jc@orc.org
Time Allowances in secs/NM
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Beat VMG681.6565.8510.4475.9452.9436.0413.3399.6
52°436.3369.8337.2320.1309.5302.5293.2287.3
60°406.2348.1320.3306.4298.0292.2284.7279.6
75°382.1331.3307.9295.0286.8281.4274.5269.3
90°382.3330.9306.0292.0282.8276.0266.5260.3
110°424.6356.5315.6294.5282.9276.7267.3258.3
120°450.8365.3319.4296.2282.6272.9261.0252.4
135°503.8400.3343.0310.4292.5280.9262.9246.8
150°606.4473.2400.5352.1319.4299.4276.6260.0
Run VMG700.2546.4462.4406.6368.3341.0303.0279.3
Selected Courses
Windward / Leeward690.9556.1486.4441.3410.6388.5358.2339.5
All purpose520.1426.9378.5349.5330.8317.9300.7289.2
Single Number Scoring Options
CourseTime On
Distance		Time On
Time
Windward / Leeward458.71.3081
All purpose362.21.6563
Rated boat velocities in knots
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Beat Angles45.3°43.0°42.1°41.2°40.3°39.3°37.9°37.0°
Beat VMG5.286.367.057.567.958.268.719.01
52°8.259.7310.6811.2511.6311.9012.2812.53
60°8.8610.3411.2411.7512.0812.3212.6512.87
75°9.4210.8711.6912.2012.5512.7913.1113.37
90°9.4210.8811.7612.3312.7313.0413.5113.83
110°8.4810.1011.4112.2312.7313.0113.4713.94
120°7.999.8511.2712.1512.7413.1913.8014.26
135°7.158.9910.4911.6012.3112.8213.7014.58
150°5.947.618.9910.2211.2712.0213.0113.85
Run VMG5.146.597.798.859.7810.5611.8812.89
Gybe Angles140.2°143.1°144.0°147.6°151.6°156.3°172.7°179.0°
ORC Ref  02920003ECIIssued on 24/09/2024Valid until 31/12/2024
VPP ver: 2024 1.00JC | © ORC | www.orc.org
J Class
Certificate
2024
RAINBOW
J-KZ1
ORC J Class
Rating Office
orc.org/organization/jclass
jc@orc.org
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Measurement Trim)
LOA39.924Max. Beam6.430Draft4.750Displacement158,056Wetted area195.22IMS L27.239LSM025.854Sink (kg/mm) 120.85
SUPERSTRUCTURES
Area Front1.50Area Side2.06
PROPELLER (measured)
Propeller TypeFeathering 4 blades
InstallationIn ApertureTwin screwNo
PRD1.050PIPA0.0650
RIG
Forestay tensionAftInner stayNone FittedMast materialCarbonNon-circular riggingNoFiber riggingYesRunners/Checkstays2Spreaders3Jumper StrutsYes
P47.890IG41.731ISP42.223MDT10.310MDL10.624MDT20.231MDL20.362TL11.390MW0.557GO0.557
E18.236J15.320BAS2.188FSD0.000SFJ1.450SPL16.080TPS16.020BD0.653MWT2605.00MCG16.566
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodBoom incliningFlotation Date22/05/2024
SFFP6.693FFM2.009FF2.013LCFcl21.751SG1.0270
SAFP33.918FAM1.380FA1.389LCFsh21.980HBI1.725
W1920.0W2920.0W3920.0W4920.0LCFD22.920
PD1187.2PD2187.1PD3187.2PD4187.1
WD15.208PLM9000.00GSA1.0RSA1.0RM5887.4
BALLAST
TANKS
IdDescriptionCapacityLCGVCGSWLMCMLSCSFO_PS3,16021.14-1.510.84000.0%022.3%705FO_SB3,16021.14-1.510.84000.0%022.2%702FO_DAY20423.73-0.230.840070.1%14395.0%194DLO52023.12-1.580.84002.5%130.0%0FW_PS2,06017.73-1.461.00000.4%924.3%501FW_SB2,06017.73-1.461.00000.4%924.2%499GW_AFT1,05025.96-2.361.00000.9%90.0%0GW_FWD67013.83-1.861.00000.9%60.0%0
INVENTORY
IdDescriptionWMWSLCGVCGGAIdDescriptionWMWSLCGVCGGAA2 CREW BY MAST16017.502.31    B1 CREW - GALLEY TABLE8015.75-0.05    EJEROEN9027.231.46    FMAT @ HELM8530.082.96    GMEASURING EQUIPMENT3027.231.46    HBOW LINE ON DECK3013.002.06    IMAIN ON BOOM40023.484.07    JFENDERS2524.001.86   
Abbreviation Legend
SW: Specific WeightLM: Level MeasurementCM: Condition MeasurementLS: Level SailingCS: Condition SailingWM: Weight MeasurementWS: Weight SailingGA: Gyradius Adjustment
ORC Ref  02920003ECIIssued on 24/09/2024Valid until 31/12/2024
VPP ver: 2024 1.00JC | © ORC | www.orc.org
J Class
Certificate
2024
RAINBOW
J-KZ1
ORC J Class
Rating Office
orc.org/organization/jclass
jc@orc.org
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentMN-A0.103.346.1910.9114.73492.0213/08/20242024
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingAreaMeas.DateCommentG1L-A0.152.464.839.6414.6319.6643.33NoNo422.7221/08/20242024G1H-A0.152.374.739.5914.6819.5343.37NoNo421.0213/08/20242024G2-A0.152.084.118.5613.5119.0043.25NoNo388.7921/08/20242024G3-A0.151.953.827.3110.9514.8843.30YesNo320.3713/08/20242024SS-A0.081.903.676.728.9810.6035.00NoInner213.2420/09/20232024GS-A0.121.312.434.736.969.0328.99NoInner135.1510/11/20232024
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateCommentS2-A43.3843.4043.3925.3925.86921.4628/08/20242024S243.0042.9542.9825.2427.65921.1714/09/2024
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateCommentA244.5840.0942.3425.9226.7797%920.4314/09/2024A2-A44.9541.3543.1525.5925.60100%920.2528/08/20242024A444.7040.3142.5125.9226.00100%918.6728/08/2024A144.4239.7742.1023.6825.8092%845.5503/05/2024A1-A44.5540.7742.6622.9326.2088%838.4128/08/20242024
ORC Ref  02920003ECIIssued on 24/09/2024Valid until 31/12/2024
VPP ver: 2024 1.00JC | © ORC | www.orc.org