Non Spin/HSFClub Certificate2025
MAYATUR 648
Turkiye
Sailing
Federation
www.tyf.org.tr/
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 Angles45.1°45.1°43.5°42.5°41.0°40.5°40.6°42.3°45.6°
Beat VMG1.882.593.153.553.823.933.943.853.57
52°2.954.024.815.295.555.685.725.725.55
60°3.164.275.055.475.705.855.915.955.87
75°3.314.435.215.625.866.036.176.316.33
90°3.244.375.175.625.906.106.296.586.74
110°2.853.974.875.495.846.106.346.827.31
120°2.693.784.695.365.756.026.276.777.38
135°2.353.374.295.025.535.846.096.547.06
150°1.922.833.694.425.025.485.806.266.73
Run VMG1.692.533.344.074.725.265.646.136.58
Gybe Angles170.0°170.0°171.2°172.8°173.9°175.9°177.7°178.2°178.0°
APH ToD:738.1CDL: 5.582APH ToT: 0.8129CertNo:
BOAT
ClassROBERTS 246DesignerBRUCE ROBERTSBuilderAge date06/1986Series date06/1986Offset fileROBERTS246.offData fileTUR 648
HULL
Length Overall7.400 mMaximum Beam2.500 mDraft1.206 mDisplacement1,800 kgDLR9.1687IMS DivisionCruiser/RacerDynamic Allowance0.380%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeSolid 3 bladesDiameter0.200m
CREW
Maximum weight400 kg(declared)Minimum weight270 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail14.7315.28Headsail Luffed15.1015.10Headsail FlyingSymmetricAsymmetric
STORM SAIL AREAS (m²)
Trysail4.20Storm Jib4.42Heavy Weather Jib11.93
SAIL LIMITS
Headsails1
✱ One set on the forestay
✱ Zero set flying
Spinnakers0
✱ No 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
MAYATUR 648
Turkiye
Sailing
Federation
www.tyf.org.tr/
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 VMG1916.71390.41144.51014.4941.4915.3912.6936.01007.7
52°1220.2895.2748.4680.7648.7633.6629.0629.1648.7
60°1138.0842.5712.7657.8631.1615.9608.9605.1612.9
75°1089.2811.9691.6640.3614.7596.7583.6570.9568.7
90°1112.0824.0696.9640.3610.7590.1572.8547.3533.8
110°1261.4906.1739.0656.2616.8590.3567.6527.7492.6
120°1336.0951.5767.7672.1626.2598.0574.6531.8488.1
135°1533.31067.1839.9717.1651.0616.1591.5550.3509.8
150°1878.71271.2974.5815.1716.8656.9621.2574.7535.0
Run VMG2131.31425.51077.6883.6763.3684.9638.8587.0546.8
Selected Courses
Windward / Leeward2018.81408.01111.1949.0852.3800.1775.7761.5777.3
All purpose1518.51081.1873.1765.6705.6672.9654.9636.4635.4
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward902.70.6647
All purpose738.10.8129
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.5789
Downwind "popa"0.6930
70% up, 30% down "Ilhabela"0.6090
30% up, 70% down "Ilhabela-inverso"0.6543
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Predominantly Upwind790.30.7592
Predominantly Downwind752.70.7971
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low977.10.6141
Triple Number AP Medium731.50.8203
Triple Number AP High652.50.9196
Triple Number Windward/Leeward Low1319.80.4546
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Single Number Predominant Upwind826.90.7256
Single Number Predominant Reaching735.90.8153
Single Number Predominant Downwind794.20.7554
Predominant Upwind - Low1161.70.5165
Predominant Upwind - Low/Med874.10.6865
Predominant Upwind - Medium760.80.7886
Predominant Upwind - Med/High712.20.8424
Predominant Upwind - High707.30.8483
Predominant Downwind Low1217.80.4927
Predominant Downwind Low/Med868.50.6908
Predominant Downwind Medium720.20.8331
Predominant Downwind Med/High638.50.9397
Predominant Downwind High603.20.9948
Predominant Reaching Low1051.10.5708
Predominant Reaching Low/Med785.30.7640
Predominant Reaching Medium679.30.8832
Predominant Reaching Med/High623.60.9621
Predominant Reaching High599.41.0010
SA/DSPL Upwind20.12SA/DSPL Downwind20.12
Scoring OptionTODTOT
5-Band Windward/Leeward Low1487.80.4033
5-Band Windward/Leeward Low/Med1059.50.5663
5-Band Windward/Leeward Medium874.90.6858
5-Band Windward/Leeward Med/High783.80.7655
5-Band Windward/Leeward High766.70.7826
Windward/Leeward 60-40 Low1482.30.4048
Windward/Leeward 60-40 Low/Med1068.50.5615
Windward/Leeward 60-40 Medium892.70.6721
Windward/Leeward 60-40 Med/High811.00.7399
Windward/Leeward 60-40 High802.20.7479
5-Band AP Low1094.50.5482
5-Band AP Low/Med841.10.7134
5-Band AP Medium719.80.8335
5-Band AP Med/High659.00.9104
5-Band AP High639.40.9383
5-Band SF Bay Tour - Low1276.70.4700
5-Band SF Bay Tour - Low/Med1018.80.5889
5-Band SF Bay Tour - Medium852.10.7042
5-Band SF Bay Tour - Med/High772.90.7763
5-Band SF Bay Tour - High758.80.7907
Chicago-Mac Upwind0.7022
Chicago-Mac All Purpose0.7179
Chicago-Mac Downwind0.7263
Bayview-Mac Cove Island0.5115
Bayview-Mac Shore0.5168
Harvest Moon Regatta638.80.9393
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance804.2
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating804.20.7461
FinRating, kevyt tuuli1466.60.6818
FinRating, kova tuuli644.90.7753
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance0.7461
Triple Number Coastal/Long Distance Low0.6141
Triple Number Coastal/Long Distance Medium0.8204
Triple Number Coastal/Long Distance High0.9196
Triple Number Windward/Leeward Low0.4764
Triple Number Windward/Leeward Medium0.6719
Triple Number Windward/Leeward High0.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
For information
General Purpose Handicap (GPH)834.3
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low977.0
Triple Number Coastal/Long Distance Medium731.4
Triple Number Coastal/Long Distance High652.5
Triple Number Windward/Leeward Low1259.4
Triple Number Windward/Leeward Medium893.0
Triple Number Windward/Leeward High776.5
Predominantly Upwind790.3
Predominantly Downwind752.7
Predominantly Reaching718.4
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.6141
Triple Number Coastal/Long Distance Medium0.8204
Triple Number Coastal/Long Distance High0.9196
Triple Number Windward/Leeward Low0.4764
Triple Number Windward/Leeward Medium0.6719
Triple Number Windward/Leeward High0.7727
Coastal/Long Distance0.7461
Predominantly Upwind0.7592
Predominantly Downwind0.7971
For information
General Purpose Handicap (GPH)834.3
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)0.8129
Distanseseilas Trippeltall svak vind0.6141
Distanseseilas Trippeltall mellomvind0.8204
Distanseseilas Trippeltall sterk vind0.9196
Pølsebane Trippeltall svak vind0.4764
Pølsebane Trippeltall mellomvind0.6719
Pølsebane Trippeltall sterk vind0.7727
Motvind Singeltall0.7592
Medvind Singeltall0.7971
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Coastal/Long Distance804.20.7461
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind790.30.7592
Predominantly Downwind752.70.7971
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore772.60.7766
Cape Doctor Coastal635.70.9438
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.6141
Triple Number Coastal/Long Distance Medium0.8204
Triple Number Coastal/Long Distance High0.9196
Triple Number Windward/Leeward Low0.4764
Triple Number Windward/Leeward Medium0.6719
Triple Number Windward/Leeward High0.7727
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.6141
Triple Number Coastal/Long Distance Medium0.8204
Triple Number Coastal/Long Distance High0.9196
Triple Number Windward/Leeward Low0.4764
Triple Number Windward/Leeward Medium0.6719
Triple Number Windward/Leeward High0.7727
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Predominantly Upwind790.30.7592
Predominantly Downwind752.70.7971
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance804.20.7461
Triple Number Coastal/Long Distance Low977.00.6141
Triple Number Coastal/Long Distance Medium731.40.8204
Triple Number Coastal/Long Distance High652.50.9196
Triple Number Windward/Leeward Low1259.40.4764
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance2161.81409.71046.4860.5754.1699.2662.2603.4591.0
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low977.10.6141
Triple Number AP Medium731.50.8203
Triple Number AP High652.50.9196
Triple Number Windward/Leeward Low1319.80.4546
Triple Number Windward/Leeward Medium893.00.6719
Triple Number Windward/Leeward High776.50.7727
Single Number Predominant Upwind826.90.7256
Single Number Predominant Reaching735.90.8153
Single Number Predominant Downwind794.20.7554
Predominant Upwind - Low1161.70.5165
Predominant Upwind - Low/Med874.10.6865
Predominant Upwind - Medium760.80.7886
Predominant Upwind - Med/High712.20.8424
Predominant Upwind - High707.30.8483
Predominant Downwind Low1217.80.4927
Predominant Downwind Low/Med868.50.6908
Predominant Downwind Medium720.20.8331
Predominant Downwind Med/High638.50.9397
Predominant Downwind High603.20.9948
Predominant Reaching Low1051.10.5708
Predominant Reaching Low/Med785.30.7640
Predominant Reaching Medium679.30.8832
Predominant Reaching Med/High623.60.9621
Predominant Reaching High599.41.0010
SA/DSPL Upwind20.12SA/DSPL Downwind20.12
Scoring OptionTODTOT
5-Band Windward/Leeward Low1487.80.4033
5-Band Windward/Leeward Low/Med1059.50.5663
5-Band Windward/Leeward Medium874.90.6858
5-Band Windward/Leeward Med/High783.80.7655
5-Band Windward/Leeward High766.70.7826
Windward/Leeward 60-40 Low1482.30.4048
Windward/Leeward 60-40 Low/Med1068.50.5615
Windward/Leeward 60-40 Medium892.70.6721
Windward/Leeward 60-40 Med/High811.00.7399
Windward/Leeward 60-40 High802.20.7479
5-Band AP Low1094.50.5482
5-Band AP Low/Med841.10.7134
5-Band AP Medium719.80.8335
5-Band AP Med/High659.00.9104
5-Band AP High639.40.9383
5-Band SF Bay Tour - Low1276.70.4700
5-Band SF Bay Tour - Low/Med1018.80.5889
5-Band SF Bay Tour - Medium852.10.7042
5-Band SF Bay Tour - Med/High772.90.7763
5-Band SF Bay Tour - High758.80.7907
Chicago-Mac Upwind0.7022
Chicago-Mac All Purpose0.7179
Chicago-Mac Downwind0.7263
Bayview-Mac Cove Island0.5115
Bayview-Mac Shore0.5168
Harvest Moon Regatta638.80.9393
Non Spin/HSFClub Certificate2025
MAYATUR 648
Turkiye
Sailing
Federation
www.tyf.org.tr/
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassROBERTS 246Measurement27/10/2025HINPlan reviewHull constructionSolidCarbon rudderNoLight stanchionsNoTrim tabNo
LOA7.400Max. Beam2.500Draft1.206Displacement1,800Wetted area11.74IMS L6.131LSM05.811Acc. length7.404Sink (kg/mm) 8.50
VCGD-0.088VCGM-0.089RM Rated (kg·m) 31.0Limit of positive stability(°) N/AStability IndexN/ADefault crew weight317Declared crew weight400
PROPELLER
Propeller TypeSolid 3 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.200PBWPIPA0.0071
PSD0.025PHD0.050PHL0.035
PSA28.2°ESL0.500
ST10.022ST20.080ST30.080
ST40.057ST50.014
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerYesMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0Checkstays0Spreaders1Rotating mastNo
P8.000IG9.400ISPMDT10.120MDL10.160MDT2MDL2TLNo TaperMWGO
E3.000J2.750BAS1.500FSDSFJ0.050SPLWPLTPSBD0.100MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodRM estimatedFlotation Date27/10/2025
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Non Spin/HSFClub Certificate2025
MAYATUR 648
Turkiye
Sailing
Federation
www.tyf.org.tr/
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment00.150.751.231.982.5514.73IMS rule 109.1
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment00.060.430.801.552.303.009.80NoNo 15.10IMS rule 111.2
CRUISER/RACER REQUIREMENTS*
Accommodation length7.4 mTable area0.22 m²Headroom1.40 mMinimum number of berths2Personal gear stowage0.08 m³Fresh water capacity14 lMinimum number of seats in cockpit2Food stowage0.12 m³Fuel capacity20 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.