Multihull Club
Certificate
2024

Boat

Three Bird

284

ORC Multihull
Rating Office
www.orc.org/multihull
mh@orc.org
Rated boat velocities in knots
Wind Velocity6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Beat Angles38.9°38.9°40.4°42.8°45.2°46.0°45.2°46.7°
Beat VMG4.345.005.556.046.466.686.476.91
52°6.337.368.389.3910.2110.6210.2611.04
60°6.617.749.4310.6811.3311.8711.5412.51
75°7.208.8010.7612.5812.7813.8113.8815.19
90°7.278.9911.2413.5315.1915.5816.0718.01
110°6.868.3610.4112.8015.2517.5019.4320.68
120°6.487.959.8111.9714.2016.5220.3922.61
135°5.907.198.7010.6212.7815.1319.9223.31
150°5.086.137.288.7410.4912.3916.5319.85
Run VMG4.405.316.317.579.0810.7314.3217.19
Gybe Angles145.8°147.3°141.5°139.0°138.1°137.2°138.1°142.2°
MHR:412.8CertNo:MC091
BOAT
ClassF31 Centre CockpitDesignerFarrier_IanBuilderCorsair MarineAge date01/2007Series date01/1992Offset fileF-31CC.offData fileMC091-F31#284-Three Bird
HULL
Length Overall30.840 ftMaximum Beam22.441 ftDraft5.500 ftDisplacement4,119 lbsDLR2.3321Dynamic Allowance0.000%Age Allowance0.487%
PROPELLER
InstallationNo PropellerTypeN/ADiameterN/A
CREW
Weight669 lbs(default)Crew Arm Extension
SAIL AREAS (ft²)
MeasuredRatedMainsail447.88499.56Headsail Luffed222.37222.37Headsail Flying553.68SymmetricAsymmetric972.90
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.

Multihull Club
Certificate
2024

Boat

Three Bird

284

ORC Multihull
Rating Office
www.orc.org/multihull
mh@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 VMG828.9719.6648.3596.3557.7538.8556.2520.9
52°568.6489.0429.7383.4352.5339.1350.8326.1
60°544.9464.9382.0337.0317.8303.2312.1287.8
75°499.8409.1334.5286.2281.7260.7259.3237.0
90°495.4400.3320.2266.0237.0231.1224.0199.9
110°524.9430.8345.7281.2236.0205.7185.3174.1
120°555.7453.0367.0300.9253.5217.9176.6159.2
135°610.3500.6413.7339.1281.7237.9180.7154.4
150°709.0587.3494.4412.0343.3290.6217.7181.3
Run VMG818.7678.2570.9475.7396.4335.5251.4209.4
Selected Courses
Windward / Leeward823.8698.9609.6536.0477.1437.2403.8365.1
All purpose637.8534.7455.9394.5352.3323.4302.0274.2
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward553.11.0848
All purpose412.81.4535
 

Multihull Club
Certificate
2024

Boat

Three Bird

284

ORC Multihull
Rating Office
www.orc.org/multihull
mh@orc.org
Data in feet/pounds (Imperial)
HULL AND APPENDAGES (Lightship Trim)
ClassF31 Centre CockpitMeasurementHINCSR30284G607
LOA30.840Max. Beam22.441Draft5.500Displacement4,119Dspl lightship3,450Wetted area107.78
Superstructure frontal area43.33Superstructure lateral area122.95Default crew weight669Declared crew weightN/A
PROPELLER
Propeller TypeNo Propeller
Hydro generatorNo
RIG
Single headsail furlerNoMainsail furlerArticulated bowspritNoNon-circular riggingNoAdjustable mast footNoRunners/Checkstays0Spreaders1Rotating mastYesMast rakeMast cant angle
P40.580IG34.800ISP39.000MDT10.375MDL10.750MDT20.375MDL20.750TLMW0.750GO0.750
E14.300J11.000JZ3.300BAS2.330FSDFoilSFJ0.100SPLWPLTPS18.600BD
ForetrianglesIdITPTPZComment034.80011.0003.300main forestay039.00018.6003.300ISP/TPS136.90017.4003.300Screecher
FLOTATION
Flotation Date09/04/2024
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible

Multihull Club
Certificate
2024

Boat

Three Bird

284

ORC Multihull
Rating Office
www.orc.org/multihull
mh@orc.org
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateCommentMain5.507.759.3311.5813.17447.88
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateCommentJ00.154.148.3815.6221.1623.1739.75NoYes1553.6821/03/2024J30.161.803.516.7310.1012.0133.99NoNo0222.3721/03/2024
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioFTAreaMeas.DateCommentASpin44.7540.5842.6726.3331.5084%0972.90