International Certificate2026
SWIFTSUREUSA 40888
US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
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 Angles44.6°41.1°38.5°36.9°36.3°35.8°35.4°35.1°35.7°
Beat VMG3.444.645.365.715.906.036.136.246.24
52°5.326.907.677.998.178.298.388.528.58
60°5.697.197.908.228.398.518.628.778.86
75°5.987.408.088.448.668.838.989.269.45
90°5.897.308.048.488.809.079.329.7410.02
110°5.196.717.858.498.979.439.8110.3410.66
120°4.726.497.698.388.909.439.9710.8411.57
135°4.105.797.057.928.519.019.5810.7812.59
150°3.374.836.027.077.888.458.9510.0811.40
Run VMG2.924.185.216.136.937.608.159.1010.15
Gybe Angles137.5°141.2°145.1°151.6°157.4°165.1°169.8°170.5°170.0°
APH ToD:476.0CDL: 12.053APH ToT: 1.2604CertNo:US6809
BOAT
ClassNELSON MAREK 50 CUSTOM FILEDesignerNELSON/MAREKBuilderESPIRITAge date03/1991Series date01/1990Offset fileNELSONMAREK50-USA40888.offData fileUS6809
HULL
Length Overall15.167 mMaximum Beam4.504 mDraft3.057 mDisplacement10,079 kgDLR6.5492IMS DivisionPerformanceDynamic Allowance0.000%Age Allowance0.650%RS Assessment-0.331%
PROPELLER
InstallationShaft exposedTypeFeathering 2 bladesDiameter0.525m
CREW
Maximum weight840 kg(declared)Minimum weight710 kg ✱ when appliedCrew Arm Extension0.00 m
SAIL AREAS (m²)
MeasuredRatedMainsail86.1487.94Headsail Luffed75.1675.16Headsail FlyingSymmetric141.91141.91Asymmetric130.76130.76 (All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS Maximum (m²)
Trysail25.85Storm Jib16.92Heavy Weather Jib45.68
SAIL LIMITS
Headsails7Spinnakers5
✱ Asymmetric SHALL NOT be tacked on the pole
STABILITY
Righting Moment 290.4 kg·m Stability Index 115.7
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  04560004URV Issued on 06/07/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org
International Certificate2026
SWIFTSUREUSA 40888
US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
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 VMG1047.0776.3671.1630.3610.1597.2587.6576.5577.2
52°676.2522.1469.2450.5440.6434.4429.4422.7419.5
60°633.1500.6456.0438.1429.2423.0417.8410.4406.1
75°602.2486.7445.8426.6415.5407.7400.8388.9381.1
90°611.7493.1447.7424.4409.1396.7386.1369.6359.2
110°693.8536.2458.6423.9401.3381.7367.0348.3337.8
120°763.4555.1467.9429.4404.7381.9361.0332.1311.1
135°877.9622.0510.4454.5423.3399.4375.9333.9286.0
150°1069.4745.8598.1509.4457.0425.9402.3357.0315.9
Run VMG1234.9861.2690.7587.4519.6473.9441.7395.8354.6
Selected Courses
Windward / Leeward1140.9818.7680.9608.9564.9535.5514.6486.1465.9
All purpose852.2629.9537.4492.1465.1446.2431.5409.1392.2
Single Number Scoring Options
Course Time On
Distance 		Time On
Time
Windward / Leeward583.11.0289
All purpose476.01.2604
Custom scoring options for Australia
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Custom scoring options for Austria
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Brazil
Scoring Option Time On
Time
Upwind "bolina"0.9440
Downwind "popa"1.0578
70% up, 30% down "Ilhabela"0.9755
30% up, 70% down "Ilhabela-inverso"1.0209
Custom scoring options for Bulgaria
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Predominantly Upwind509.01.1787
Predominantly Downwind488.71.2278
Custom scoring options for Canada
Scoring OptionTODTOT Scoring OptionTODTOT Scoring OptionTODTOT Single Number AP492.91.2172 Predom. Rc High388.31.5453 5B SF Bay L/M625.00.9599 TriNum AP Low583.71.0280 Predom. Dn Low717.90.8357 5B SF Bay Med552.21.0866 TriNum AP Med475.41.2620 Predom. Dn L/M547.81.0953 5B SF Bay M/H504.11.1903 TriNum AP High426.81.4059 Predom. Dn Med474.81.2636 5B SF Bay High476.11.2602 TriNum W/L Low781.70.7675 Predom. Dn M/H423.31.4174 5B AP Low640.60.9367 TriNum W/L Med581.91.0311 Predom. Dn High388.51.5443 5B AP L/M524.41.1442 TriNum W/L Hig509.21.1784 ChiMac Up Low607.00.9885 5B AP Med469.61.2776 Predom. Upwind523.21.1468 ChiMac Up Med561.11.0693 5B AP M/H433.01.3856 Predom. Reaching469.41.2783 ChiMac Up High505.51.1869 5B AP High410.01.4633 Predom. Downwind506.61.1843 ChiMac Off Low627.20.9567 5B W/L Low864.80.6938 Predom. Up Low669.80.8958 ChiMac Off Med559.81.0718 5B W/L L/M658.70.9109 Predom. Up L/M543.51.1040 ChiMac Off High478.21.2548 5B W/L Med572.81.0476 Predom. Up Med498.31.2041 ChiMac AP Low613.40.9781 5B W/L M/H517.61.1592 Predom. Up M/H469.91.2767 ChiMac AP Med557.81.0756 5B W/L High487.61.2306 Predom. Up High453.01.3245 ChiMac AP High490.31.2238 W/L 60-40 Low855.40.7014 Predom. Rc Low615.50.9748 BayMac Cove Island697.70.8600 W/L 60-40 L/M659.60.9097 Predom. Rc L/M495.11.2119 BayMac Shore690.30.8692 W/L 60-40 Med581.11.0325 Predom. Rc Med447.21.3417 Harvest Moon421.41.4237 W/L 60-40 M/H531.91.1280 Predom. Rc M/H412.81.4535 5B SF Bay Low730.50.8214 W/L 60-40 High505.81.1864      SA/DSPL Up34.31SA/DSPL Dn48.50
Custom scoring options for Cyprus
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Denmark
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Spain
Scoring Option Time On
Distance
Coastal/Long Distance517.5
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Estonia
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Custom scoring options for Finland
Scoring Option Time On
Distance 		Time On
Time
FinRating517.51.1594
FinRating, kevyt tuuli849.41.1773
FinRating, kova tuuli411.91.2138
Custom scoring options for France
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Custom scoring options for Germany
Scoring Option Time On
Time
Coastal/Long Distance1.1594
Triple Number Coastal/Long Distance Low1.0280
Triple Number Coastal/Long Distance Medium1.2621
Triple Number Coastal/Long Distance High1.4059
Triple Number Windward/Leeward Low0.8002
Triple Number Windward/Leeward Medium1.0311
Triple Number Windward/Leeward High1.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
For information
General Purpose Handicap (GPH)527.8
Custom scoring options for Greece
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Saronikos S All Purpose525.81.1411
Saronikos S Upwind574.31.0447
Saronikos S Downwind467.21.2843
Saronikos N All Purpose549.01.0930
Saronikos N Upwind589.21.0184
Saronikos N Downwind508.41.1801
Saronikos SW All Purpose522.91.1475
Saronikos SW Upwind579.11.0361
Saronikos SW Downwind470.61.2749
Saronikos NE All Purpose566.01.0600
Saronikos NE Upwind552.91.0852
Saronikos NE Downwind563.81.0641
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Hungary
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Custom scoring options for Ireland
Scoring OptionTODTOT
Single Number All-Purpose492.91.2172
5-Band All Purpose Low689.30.8704
5-Band All Purpose L/M543.71.1036
5-Band All Purpose Med485.31.2362
5-Band All Purpose M/H445.81.3459
5-Band All Purpose High420.41.4272
Single Number Predominant Upwind507.51.1823
Single Number Predominant Reaching456.71.3138
Single Number Predominant Downwind489.81.2250
5-Band 50-50 Windward/Leeward Low864.80.6938
5-Band 50-50 Windward/Leeward L/M658.70.9109
5-Band 50-50 Windward/Leeward Med572.81.0476
5-Band 50-50 Windward/Leeward M/H517.61.1592
5-Band 50-50 Windward/Leeward High487.61.2306
5-Band 60-40 Windward/Leeward Low855.40.7014
5-Band 60-40 Windward/Leeward L/M659.60.9097
5-Band 60-40 Windward/Leeward Med581.11.0325
5-Band 60-40 Windward/Leeward M/H531.91.1280
5-Band 60-40 Windward/Leeward High505.81.1864
Triple Number 50-50 Windward/Leeward Low781.70.7675
Triple Number 50-50 Windward/Leeward Med581.91.0310
Triple Number 50-50 Windward/Leeward High509.21.1784
Scoring OptionTODTOT
Single Number 60-40 Windward/Leeward590.91.0154
Triple Number 60-40 Windward/Leeward Low775.80.7734
Triple Number 60-40 Windward/Leeward Med589.31.0182
Triple Number 60-40 Windward/Leeward High524.51.1439
Triple Number All-Purpose Low629.90.9526
Triple Number All-Purpose Med491.61.2205
Triple Number All-Purpose High439.01.3667
Triple Number Predominant Upwind Low623.60.9621
Triple Number Predominant Upwind Med504.91.1884
Triple Number Predominant Upwind High469.51.2781
Triple Number Predominant Reaching Low569.51.0535
Triple Number Predominant Reaching Med459.31.3063
Triple Number Predominant Reaching High399.31.5025
Triple Number Predominant Downwind Low647.20.9270
Triple Number Predominant Downwind Med484.31.2389
Triple Number Predominant Downwind High406.91.4744
Custom scoring options for Israel
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Japan
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Korea
Scoring Option Time On
Distance
Triple Number Coastal/Long Distance Low583.7
Triple Number Coastal/Long Distance Medium475.4
Triple Number Coastal/Long Distance High426.8
Triple Number Windward/Leeward Low749.8
Triple Number Windward/Leeward Medium581.9
Triple Number Windward/Leeward High509.2
Predominantly Upwind509.0
Predominantly Downwind488.7
Predominantly Reaching465.7
Custom scoring options for Lithuania
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Netherlands
Scoring Option Time On
Time
Triple Number Coastal/Long Distance Low1.0280
Triple Number Coastal/Long Distance Medium1.2621
Triple Number Coastal/Long Distance High1.4059
Triple Number Windward/Leeward Low0.8002
Triple Number Windward/Leeward Medium1.0311
Triple Number Windward/Leeward High1.1784
Coastal/Long Distance1.1594
Predominantly Upwind1.1787
Predominantly Downwind1.2278
For information
General Purpose Handicap (GPH)527.8
Custom scoring options for Norway
Scoring Option Time On
Time
Distanseseilas Singeltall  (APH)1.2604
Distanseseilas Trippeltall svak vind1.0280
Distanseseilas Trippeltall mellomvind1.2621
Distanseseilas Trippeltall sterk vind1.4059
Pølsebane Trippeltall svak vind0.8002
Pølsebane Trippeltall mellomvind1.0311
Pølsebane Trippeltall sterk vind1.1784
Motvind Singeltall1.1787
Medvind Singeltall1.2278
Custom scoring options for Portugal
Scoring Option Time On
Distance 		Time On
Time
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Coastal/Long Distance517.51.1594
Custom scoring options for Russia
Scoring Option Time On
Distance 		Time On
Time
Predominantly Upwind509.01.1787
Predominantly Downwind488.71.2278
Custom scoring options for South Africa
Scoring Option Time On
Distance 		Time On
Time
Cape Doctor Inshore471.91.2713
Cape Doctor Coastal397.21.5104
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Custom scoring options for Slovenia
Scoring Option Time On
Time
Triple Number Coastal/Long Distance Low1.0280
Triple Number Coastal/Long Distance Medium1.2621
Triple Number Coastal/Long Distance High1.4059
Triple Number Windward/Leeward Low0.8002
Triple Number Windward/Leeward Medium1.0311
Triple Number Windward/Leeward High1.1784
Custom scoring options for Switzerland
Scoring Option Time On
Time
Triple Number Coastal/Long Distance Low1.0280
Triple Number Coastal/Long Distance Medium1.2621
Triple Number Coastal/Long Distance High1.4059
Triple Number Windward/Leeward Low0.8002
Triple Number Windward/Leeward Medium1.0311
Triple Number Windward/Leeward High1.1784
Custom scoring options for Sweden
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Predominantly Upwind509.01.1787
Predominantly Downwind488.71.2278
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for Ukraine
Scoring Option Time On
Distance 		Time On
Time
Coastal/Long Distance517.51.1594
Triple Number Coastal/Long Distance Low583.71.0280
Triple Number Coastal/Long Distance Medium475.41.2621
Triple Number Coastal/Long Distance High426.81.4059
Triple Number Windward/Leeward Low749.80.8002
Triple Number Windward/Leeward Medium581.91.0311
Triple Number Windward/Leeward High509.21.1784
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1150.3823.0643.2551.7495.5462.9435.7392.5375.9
Custom scoring options for United States of America
Scoring OptionTODTOT Scoring OptionTODTOT Scoring OptionTODTOT Single Number AP492.91.2172 Predom. Dn High388.51.5443 5B AP M/H433.01.3856 TriNum AP Low583.71.0280 Predom. Rc Low615.50.9748 5B AP High410.01.4633 TriNum AP Med475.41.2620 Predom. Rc L/M495.11.2119 5B SF Bay Low730.50.8214 TriNum AP High426.81.4059 Predom. Rc Med447.21.3417 5B SF Bay L/M625.00.9599 TriNum W/L Low781.70.7675 Predom. Rc M/H412.81.4535 5B SF Bay Med552.21.0866 TriNum W/L Med581.91.0311 Predom. Rc High388.31.5453 5B SF Bay M/H504.11.1903 TriNum W/L Hig509.21.1784 5B W/L Low864.80.6938 5B SF Bay High476.11.2602 Predom. Upwind523.21.1468 5B W/L L/M658.70.9109 ChiMac Up Low607.00.9885 Predom. Reaching469.41.2783 5B W/L Med572.81.0476 ChiMac Up Med561.11.0693 Predom. Downwind506.61.1843 5B W/L M/H517.61.1592 ChiMac Up High505.51.1869 Predom. Up Low669.80.8958 5B W/L High487.61.2306 ChiMac Off Low627.20.9567 Predom. Up L/M543.51.1040 W/L 60-40 Low855.40.7014 ChiMac Off Med559.81.0718 Predom. Up Med498.31.2041 W/L 60-40 L/M659.60.9097 ChiMac Off High478.21.2548 Predom. Up M/H469.91.2767 W/L 60-40 Med581.11.0325 ChiMac AP Low613.40.9781 Predom. Up High453.01.3245 W/L 60-40 M/H531.91.1280 ChiMac AP Med557.81.0756 Predom. Dn Low717.90.8357 W/L 60-40 High505.81.1864 ChiMac AP High490.31.2238 Predom. Dn L/M547.81.0953 5B AP Low640.60.9367 BayMac Cove Island697.70.8600 Predom. Dn Med474.81.2636 5B AP L/M524.41.1442 BayMac Shore690.30.8692 Predom. Dn M/H423.31.4174 5B AP Med469.61.2776 Harvest Moon421.41.4237      SA/DSPL Up34.31SA/DSPL Dn48.50
ORC Ref  04560004URV Issued on 06/07/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org
International Certificate2026
SWIFTSUREUSA 40888
US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassNELSON MAREK 50 CUSTOM FILEMeasurement20/06/1995HINPlan reviewHull constructionCarbonCarbon rudderYesLight stanchionsNoTrim tabNo
Length overall15.167Maximum beam4.504Draft3.057Displacement10,079Wetted area36.02IMS L12.126LSM011.544Accomod. length14.638Sink (kg/mm) 28.65
VCGD0.001VCGM0.007 RM Rated (kg·m) 290.4Limit of positive stability(°) 114.3 Stability Index 115.7 BLR index 0.0000Default crew weight845 Declared crew weight 840
Centerboard weight0.0List angle0.0Canting keel angle0.0
PROPELLER
Propeller TypeFeathering 2 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.525PBW0.138PIPA0.0047
PSD0.037PHD0.061PHL0.110
PSA18.0°ESL0.836
ST10.034ST20.132ST30.129
ST40.061ST50.217
RIG
BackstayAdjustableForestayFixedInner forestayNot installedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoBase of mastFixedRunning backstaysYesCheckstaysYesSpreaders4Rotating mastNo
P19.822IG18.337ISP18.407MDT10.104MDL10.205MDT20.071MDL20.104TL3.628MW0.186GO0.202
E7.450J5.252BAS2.082FSD0.037SFJ0.208SPL5.357WPLTPS5.460BD0.299MWT0.00MCG0.000
PY0.000MDT1Y0.000MDL1Y0.000MDT2Y0.000MDL2Y0.000TLY0.000BASY0.000EY0.000BDY0.000IY0.000EB0.000
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodPoles incliningFlotation Date20/05/2011
SFFP0.948FFM1.444FF1.462LCFcl7.723SG1.0000
SAFP14.380FAM1.127FA1.138LCFsh8.044HBI1.264
W1145.2W2145.2W3145.2W4145.2
PD1249.0PD2249.0PD3249.0PD4249.0
WD14.478PLM2029.30GSA91.6RSA6939.8RM295.9
INVENTORY
BALLASTIdKindDescriptionWeightLCGVCGTCG0Fixedlong portside506.00-0.011FixedPort365.5035Fixedport355.683Fixedport365.752Fixedport395.50Fixed Ballast Total196
TANKSIdDescriptionSp.WghtCapacityConditionLCGVCG1fuelFuel179.140.00Total deductible149.140.00
Total deductible
ORC Ref  04560004URV Issued on 06/07/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org
International Certificate2026
SWIFTSUREUSA 40888
US SAILING
1 ROGER WILLIAMS UNI WAY
BRISTOL, RI 02809
USA
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentORC0.301.502.754.736.0486.14* Copied from legacy *
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentORC7.720.00NoNo 75.16* Copied from legacy *
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateCommentORC18.0218.0218.029.459.45141.91* Copied from legacy *
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateCommentORC17.9017.9017.908.579.5590%130.76* Copied from legacy *
NON MANUAL POWER CONTROLS (NMP)
SheetsNoMainsail cunninghamNoJib trackNoSpinnaker retrieverNoBoomvangNoHeadsail cunninghamNoTack lineNoOuthaulNoMain travellerNoHalyardsNo
ORC Ref  04560004URV Issued on 06/07/2026 Valid until 28/02/2027
VPP ver: 2026 1.00 | © ORC | www.orc.org