2012 Rating Sig45 sail60045 Vamonos 120628 by 62I0JCj

VIEWS: 12 PAGES: 9

									                                                  TCF Preliminary            0.981                            PHRF Provisional               tbd

Rating Application - Bay Area Multihull Association
The Rating Committee has no responsibility for the seaworthiness or safety of yachts rated & cites US SAILING Fundamental Rule 4, "It shall be the sole
responsibility of each yacht to decide whether or not to start or to continue to race".


      Boat Name                               Vamonos!                                                            Name                       T. Siebel
      Sail Number                             60045                                                               Street
      Boat Model                              SIG45                                                               City, State, Zip
      Manufacturer                            Le Breton Yachts, built by Westerly Marine                          Email Address:
      Year Built                              2012                                                                Day Phone:
      Marina                                  TBD                                                                 Evening Phone:
      Slip Number                             TBD                                                                 Emergency #:

Do you want an ODR (One Design Rating)?                                                                 Yes   c                                                                                      No   

Mainsail 2012 / North Sails                                                  Jib / Genoa (largest) 2012 / North Sails                        Screacher 2012/ North Sails (A0)
Area:                                                      92.27     993.2   Area:                                         44.29     476.7   yes/no                                                                          yes
Luff (P)                                                   19.76     64.83   Luff Length                                   18.60     61.02   Area:                                                                        135.37       1457.1
Foot (E)                                                    6.14     20.14   LPG                                            4.71     15.46   Scr.Luff1                                                                     22.25        73.00
MGH (HeadWidth)                                             2.40      7.87   Leach                                         17.15     56.27   LPG                                                                           11.60        38.06
MGT (7/8)                                                   2.87      9.40   Foot                                           5.10     16.73   Scr.Luff2 (leach)                                                             19.00        62.34
MGU (3/4)                                                   4.09     13.43   LuffL.roach + or -                             0.00      0.00   Scr.MG                                                                         6.80        22.29
MGM (1/2)                                                   4.96     16.26   Le.roach + or -                                0.00      0.00   Scr.Foot                                                                      12.20        40.03
MastCirc                                                    0.94      3.08   Ft.roach + or -                                0.14      0.46
Full Batten or Soft                                          Full            Mid-Girth                                      2.58      0.78 Sc.SMG as % Sc.SF                                                                 56%
                                                                                                                                             CSPI = (SLU+SLE) x .25 x ASF + (ASMG-.5ASF) x (SLU+SLE)/3


Asymmetric Spin (largest) 2012/ North Sails                                  Symmetric Spin (largest)                                        Displacement (Load.cell metric or Mfg Displ)
(A3)                                                                         yes/no                                                          Wt. Measured. sails, motor                                                     6,000      13,228
Area:                                                     186.18     2,004   Area:                                                         CG Safety, dry(gas,h2o)
SLU (luff perimeter)                                       22.25     73.00   SL                                                       0.00 WE (ocean races)
SLE (leech perimeter)                                      19.00     62.34   SSMG                                                     0.00   Wt. Sailing                                                                    6,000
SMG                                                        10.54     34.58   SSF (foot.perimeter)                                     0.00
SF (foot.perimeter)                                        12.00     39.37                                                                   WCD Weight Crew Declared                                                        auto
SMG as % SF                                                 88%              SMG as % SF                                     0%              Rated Weight                                                                   6,000
SA = (Luff+Leech)*(Foot + 4*Mid Girth) / 12

US Sailing and/or ISAF ERS methods of sail measurement may apply above, not class rules. Maximum Sail Areas and Longest Luff Lengths from Class Rules /
specifications will be assumed if not provided. Weight Sailing will be lightest boat in Class unless weighed w/inspection.

Hull                                                                         Hull - Foils                                                    Other
Length Overall:                                            13.70      4.18 Daggerboard (y/n)                                yes              Masthead Spin(yes/no)                                                             yes
Waterline length                                           13.70      4.18 Centerboard (y/n)                                  n              Masthead Scr.(yes/no)                                                             yes
Maximum Beam                                                8.40      2.56 Ctbd Fairing (y/n)                                 n              Sprit Length                                                     1.73m forward of bow
Maximum Draft                                               2.60           Keel(s) (y/n)                                      n              Rigging (SS, synthetic)                                                     synthetic
FOC Fwd Overhang                                            0.00                                                                                                                                          Water (300l), fuel (200l),
AOC Aft Overhang                                            0.00             Lifting Foils (y/n)                                             Holding Tank(s)                                                     Black water (70)

Engine(s)                                                                    Propeller (s)
Inboard (hp x type)                                2 x 29hp Yanmar           1 x feather/fold (0.980)                                        2 x feather/fold (0.970)                                                              y
Outboard (hp x type)                                                         1 x fixed (blades 0.975)                                        2 x fixed (blades 0.964)

Notes/Modifications                                                          Describe modifications / comments/ trapeze(#) or hiking straps below
06/28/12: TCF 0.984 @ WM 6,000 kg App S.Areas v. How-To.isaf 3rd place beyond decimal SMG 10.54 v 10.544 Jib H12 = -0.04 MGT 2.866 v 2.87, North Le.girths, ┐ SLU/2
06/26/12: TCF 0.954 @ WM 6,590.kg 14,528.lb freeboards (Methode de pesée franc-bord) Vam.sails SIG45 Aldéba Multi2000 msr'ed Didier Sapanel


I certify that my vessel conforms to the configuration indicated above and understand that a BAMA ratings certificate will be issued based on this
information, valid only for the indicated configuration.
Electronically
Signature of Owner                            M.Park for T.Siebel                                                                                                                              Date 6/21/2012

              Office Use Only
                         TCF                                                                        PHRF                                     Amount Paid
Mainsail Measurement - SIG45 Metric
US Sailing Multihull PHRF points
Please use Actual Area from sailmakers with the major dimensions (Luff and Foot, P, E). Sailmakers may give mainsail Girths on Luff
heights instead of the Leach measurement points. The Leach method below allows a sailor to measure their boat's sails with a competitor.
The ISAF ERS metrics are an alternative.


                                                          MGH Head Width                                                               Metric    Imperial
                                                                                                                      Mainsail            m2           ft2

                                                          MGT Mid-Girth Top                                           Area            92.29 993.42
                                                                                                                      Luff / P         19.76     64.83
                                                          7/8 Leach Point                                             Foot / E          6.14     20.14
                                                                                                                      HW / MGH          2.40      7.87
                                                                                                                      MGT               2.87      9.42
                                                                                                                      MGU               4.09     13.42
                                                                                                                      MGM               4.96     16.27
                                                                                 MGU Mid-Girth Upper                  MGL               0.00
                                                                                 ¾ Leach Point                        Class Rule includes MGL
                                                                                                                      Calculation rounds out MGL

                                                                                                       SA= (Foot*2+MGM*3+1.5*MGU+MGT+.5*HW)*Luff/8




                                                                                           MGM Mid-Girth Middle
                                                                                           ½ Leach Point


 P Luff




                                                                                                            LPM       auto-calculated for
                                                                                                                      most boats; sets sail
                                                                                                                      efficiency

                                                                                                                      Needs measurement if
                                                                                                                      PxE are not square, or
                                                                                                                      Leech for Visio




                                                                             n
                                                                      Ma i
                                                         dic   ular
                                              e   rp i n
                                     L   uff P
                                 LPM




                                          E, Foot Length


        workbook: 98b016ed-e835-47ba-ab41-5b465fa3d35e.xls                                                                         www.sfbama.org
        worksheet: Diagram_Mainsail_US-Sailing                                                                                         page 2 of 9
                                                                                                                                        SIG45_Jib_Asym_ERS




Diagrams: Jib, Asymetrical, Mainsail
Equipment Rules of Sailing (ERS) ISAF
Jib Roach on the Leech and Foot may add measurable area.

CJ -Area Jib SIG45: Class luff, lpg, mid-girth, roach: Le, Ft, -Lu                                            Metric
                      43.803             S9 = a x h / 2                                                 a     18.60
                       0.000             S10 = 2/3 b x h10 (3" 0.076m)                                  h       4.71
                       0.000             S11 = 2/3 c x h11 (3" 0.076m)                                  b     17.15
                      -0.547             S12 = 2/3 a x h12 (-3" -0.076)                                 h10     0.00                                                    S11
                      43.26              CJ = ( S9 +or- S10 +or- S11 +or- S12 ) m2                      c       8.10                                                    c
                            -1%          (CJ/S9)-1, larger than triangle                                h11     0.00
                                         Mid-Girth 86"                                                  h12    -0.04
                                                                                                                                                     C-2
                                                                                                                                                          8R
                                                                                                                                                         86" mid-g
CSPI - Area of Spinnaker SIG             45                                                                   Metric                                        2.1    ir
                                                                                                                                                                8m th

                    186.18               CSPI = SFx(SL1+SL2)/4+(SMG*-SF/2)x2/3(SL1+SL2)/2 m2            SL1    22.25        S12
                      2004.0             sq.ft                                                          SL2    19.00
                                                           SL1 or SLU = Spinnaker Luff                  SF     12.00        h12                                         h11 @
             SL2 or SLE =
             Spinnaker Leech                                                                            SMG    10.54    @ ± max
                                                                                                                                                                        ± max
                                                                             * where SMG >= 75% of SF
                                                                                           SMG % SF           87.8%                       S9
                                                                                                                        a
                                                                                                                   Luff



                                                                                                                                        LPG
                                                                                                                                              a ka
                                                                                                                                                     h

                                                                                                                                    b
                                     SMG = Spinnaker Mid-Girth
                                     @ mid-points of Luff & Leech



                                                                                                                              h10               S10


                     Clew


                 SF = Spinnaker Foot
                 SLU, SLE, SF
                 Measure on perimeters                                       Tack



CM - Area of Mainsail (Sample Data)
                                                                                                               Metric
                      77.370             S1 = ((h + h1)(a - a1) + (a1 x h))/2                           h      7.250
                       2.565             S2 = c x h2/2                                                  h1     0.135
                       0.002             S3 = 2/3 c3 x h3                                               a     20.955
                       0.007             S4 = c4 x h4/2                                                 a1     0.125
                       0.001             S5 = 2/3 c5 x h5                                               c     20.517
                       0.002             S6 = 2/3 c6 x h6                                               h2     0.250
                       1.257             S7 = 2/3 a x h7                                                c3     0.103
                       0.002             S8 = 2/3 b x h8                                                h3     0.029
                      81.20              CM* = (S1+S2+S3+S4+S5+S6+S7+S8) m2                             c4     0.109
                                                                                                        h4     0.122
                                         CM = (CM* + Area of Mast + Area of Boom) m2                    c5     0.057
                                         Non-Rotating Masts add no Sail Area                            h5     0.021
                                         Larger Multihulls Mast Area = (MC/2 * a); a = P.luff or VLM    c6     0.055
                                         Small, Area of Mast = (Total Length x Perimeter / 2) m 2       h6     0.042
                                         Small, Area of Boom = (Total Length x Height) m 2              b      0.073
                                                                                                        h7     0.090
                                                                                                        h8     0.032




     workbook: 98b016ed-e835-47ba-ab41-5b465fa3d35e.xls                                                                                                     www.sfbama.org
     worksheet: SIG45_Jib_Asym_ERS                                                                                                                              page 3 of 9
Weight Measured: Inventory and Equipment Declaration
                                           Weight Sailing lb                13227
                                           Weight Sailing kg                 6000
                                                                                                            Date: May 6 2012
This is to state that the yacht SIG45 Vamonos! USA 60045 weighs the above w/the following in a dry
condition (no:water, gas). All equipment "Declared" is part of the "Inventory" that must remain on the boat for racing including
a set of racing sails & U.S. Coast Guard required Safety Equipment applicable to the boat size. Texel Weight Equipment
(WE) of individual items is waived based on inclusion of same in Sailing Weight.

Equipment                     Description                       Equipment           Description               WE items (list)          Kg

Engine/s                      Inboard                           Mainsails           One (1) on boom
Generator                     No                                Mizzens
Anchor 1                      Yes, [Rocna] [25kg]lb/kg          Headsails           One (1) Jib, hanks
Anchor 2                      Fortress 15kg                     Headsails           One (1)staysail, One (1) Storm Jib,
Chain (size/m)                Yes[8mm]link.dia. [30]m           Spinnaker #1        One (1) Spinnaker
Rode (dia/m)                  Yes [8mm] dia. [25]m              Spinnaker #2
Moorings                      dock lines                        Screacher           One (1) w/furling gear
Fenders                       Yes (8)                           Other sails         One (1) Code 0
Drogues                       No                                Spare sheets        Minimal
Tools(kgs)                    Yes (10kg)                        Mattresses No.      3 doubles
Spares(kgs)                   Minimal (5kg)                     Seat cushions       Yes
Dinghy                        No                                Bunk cushions       Yes
Liferaft                      No                                Stove type          Gas
Outboard(hp)                  Yes [Nissan], [5] hp min.         Refrig              Yes
Battery #1 Amp/Hrs            640 amp hour                      Awning              No
Battery #2 Amp/Hrs            TBD (no)                          T.V.                Yes
VHF Radio                     handheld and fixed                Video               No
Solar panels                  No                                Radar               Yes
Gas bottles (kgs)             Yes (8kg)                         Wine Rack           No
Safety Category               Inshore - Coast Guard Req.        Safety Pack         Flares, drogue, horn
Other (list)


                                                                Other (list)
Texel AUS/NDL/THA/USA Measurement Form
Where it is simpler to count items, use numbers etc. Where it is simpler to weigh items such as tools and spares, use kgs.
For example [Chain 8mm - 50 metres], [Tools ~10kg], [Mattresses = 4], Otherwise describe [Engine - 9.8 hp Yamaha outboard
27hp Yanmar Diesel] or mark to show it is carried [Video - X]. WE may be used for Offshore Races requiring Category X equip.
                                                           WM          6000.0       Offshore Wt               WE (Offshore)             0

                                                           WM          6000.0        Inshore

SIGNED:
MEASURER                                                                            OWNER
                                               Gross: Wingin' It, dry, all sails
                                               Lifting Bridle, stays aboard while sailing
                                               NIST test deviation @ 2,000 lbs
                                               Subtract: inspection found nada
                                               Net: Wingin' It, dry, all sails




   workbook: 98b016ed-e835-47ba-ab41-5b465fa3d35e.xls                                                                         www.sfbama.org
   worksheet: Weight_Measured_Estimate                                                                                            Page 4 of 9
                                                                                                 Mast_Circumference



 Mast Circumference
 MC := Rotating Masts Only - tape or paper around mast above boom and measure from tick marks.

 Boat                                            MC         Date      Comments
 Vamonos!                                      0.940   c   06/25/12   M.Park, taper above spin halyard to be deducted later
 Native, Newick Tri                            0.908   w   08/20/09   Blue Tape, taper above spin.halyard (img_0060...)
 Antrim 30                                     0.865   t   04/05/10   TB.verified, Erin #28910
 Extreme 40, Smart Recruiters                  0.840   c   06/25/12   Texel Denmark MC, Extreme40 #4, SEB
 Humdinger, Acapella Tri                       0.800   w   03/20/10   Owner TB.Verified
 Formula 40 Tuki                               0.760   c   07/28/09   Blue Tape
 Formula 40 Shadow                             0.719   a   04/04/09   Blue tape, 1st pass, taper above hounds
 D-Class Cat Adrenaline Marstrom               0.700   c   05/30/09   Assumption, not measured pre-Delta.Ditch @RichmondYC
 SL-33 #4                                      0.665   c   12/23/11   Blue Tape, Alameda Marina
 C-37R, Miss Saigon                            0.620   a   12/01/11   P.Harper THA
 C-37R, Zhuka                                  0.600   a   07/12/10   P.Harper THA
 Viva 27 Cat Sass                              0.600   a   05/30/09   Estimate, w/o measure pre-Delta.Ditch @RichmondYC
 Seacart 30, Thor                              0.600   c   12/01/10   M.Pescott/THA
 Contour 34SC                                  0.585   a   01/08/10   Blue.Tape, measured by owner
 Corsair 31RS Leneman                          0.554   a   05/30/09   Blue Tape, C-31RS #28543 Prime Directive
 Seacart 26                                    0.530   c   11/28/11   M.Pescott/THA
 Dash 750.AUS                                  0.500   a   11/10/10   S.Barton/G.Scott AUS
 D-Class Cat Rocket88                          0.495   a   07/15/10   Wet, 1st pass, Richmond YC
 D-Class Cat Beowulf V Marstrom                0.483   c   06/01/10   Corsair 28R Section
 Corsair 28R Marstrom                          0.483   c   03/31/10   Blue Tape C-28R, Alameda Marina
 Corsair 31R Marstrom                          0.483   c   04/22/09   Blue Tape C-31R #135 Roshambo, Alameda Marina
 Corsair Sprint 750                            0.481   a   05/02/09   Blue Tape Sprint 750 #70 Afterburner, Alameda Marina
 Dash 750.THA                                  0.480   a   04/11/11   P.Herning/M.Pescott THA
 Corsair 24 Mk II                              0.397   a   08/01/09   Blue tape C-24MkII #006 Emma Jean, Alameda Marina
 Multi23                                       0.356   c   04/07/09   Blue tape M. Leneman, US Tri.Nationals, standard section


 Mast Area added to mainsail area, IF and ONLY IF, the mast rotates
 Mast Area = 1/2 * Mast Circumference* P ( mainsail luff, Vertical Luff Mainsail )
 No Correction Factor (CF) on airfoil shape, carbon, weight difference vs. aluminum, …
 CF - Carbon Mast may be added later (ref: Multi2000 CF.carbon-mast)
 a: aluminum
 SIG45 has Rotating Mast with a fore/aft dimension of 460mm below the hounds/ constant taper above hounds




workbook: 98b016ed-e835-47ba-ab41-5b465fa3d35e.xls                                                               www.sfbama.org
worksheet: Mast_Circumference                                                                                        page 5 of 9
                                                                                                               Diagram_Screacher

Screacher Measurement
Corsair 31R example

Start with the major dimensions: Luff and LP to minimally get the area of a triangle for sail area declaration. The
sailmaker's actual area will be accurate, measuring as a spinnaker is less important for PHRF. Actual area or measured
as a spinnaker is more important if the Screacher is the only downwind sail, NON-spinnaker.

Small mid-girths (<50%) make sails look like over-sized genoas that makes the boat appear faster, 200% Genoas
                              Ft2     M2
Triangle                  458.25 129.05
spin straight line      1143.41 140.25
spin on perimeters      1458.73 135.52
(max/min)-1 %            218.3% 5.0%

samples                            imp       m
Lu             Class             39.00    22.25
Lu.perimeter                     73.08    22.28
Lp             Class             23.50    11.60
SLE.perimeter                    62.34    19.00
Foot.straight                    40.03    12.20
Foot.perimeter                   40.03    12.20
Mgirth                           22.31     6.80
MG %                                         56%
ISAF/yra.org      (SLU+SLE) x .25 x ASF + (ASMG-.5ASF) x (SLU+SLE)/3
Equal             (Luff+Leech)*(Foot + 4*Mid Girth) / 12
Valid Screachers:
Mid-Girth < 75% Foot (perimeter), else spin
Mid-Girth > 50% of Foot Length (straight)


                                                                                                          SLE = Leech
                                         SLU = Luff                                                       Mid-Point
                                                                           Screacher Mid-Girth
                                          Mid-Point                              (SMG)




                                                                                  LP
                                                                                    Ga
                                                                                         ka
                                                                                              h.is
                                                                                                     af




                                                                                           Dist./2)
                                                           Mid-Girth > (Tack-Clew Straight

                                                                      Foot (SF) perimeter




workbook: 98b016ed-e835-47ba-ab41-5b465fa3d35e.xls                                                                      www.sfbama.org
worksheet: Diagram_Screacher                                                                                                Page 6 of 9
w4.1a: 38259898-07, SIG 45 Cat, Upwind Code Zero, 12600, 850, CW

                        Area M2    Area Ft2
Jib, self-tacker          44.29        477
Gennaker (Upwind C0)      89.77        966
Screacher (A0)           135.37      1,457
                                                                                  Area Asym x
                                                                     Area x Jib     ISAF girth
GKArea                     89.77                                       84.13           89.78
Msm                                                                     94%            100%
Luff                     20.150
Leech                    18.300
Foot                      9.000
LP                        0.000               8.35m, 27.4ft
                                                                   CSPI = (SLU+SLE) x .25 x ASF + (ASMG-.
Girths xISAF                                                       CSPI = SPI = (Luff+Leech)*(Foot + 4*Mid G
Head                       0.050     0.6%
3/4 from clew              2.389    26.5%
1/2 from clew              4.755    52.8% ISAF, North mid-girth        15.60
1/4 from clew              6.975    77.5%
Foot                       9.000   100.0%
Mid-Luff to Mid-Leech      5.203    57.8% Asym Spin Girth
          Area Asym x
             Spin girth
               95.52
               106%




LU+SLE) x .25 x ASF + (ASMG-.5ASF) x (SLU+SLE)/3
I = (Luff+Leech)*(Foot + 4*Mid Girth) / 12
                                                                                                                                        How-To_Sail-Areas
Basic Sail Area Measurements
                                                                                             SIG 45 see Jib, Screacher
Use the sailmaker's computer calculation for Actual Sail Area with major dimensions. It is preferred to have a sail loft actually
measure the sails and fill out this sheet or similar, if no metrics exist on the sails. Alternative: a competitor may measure sails
with the owner following Instructions Below. Please use feet and tenths of feet or metric.
Mast Circumference                0.397
                                            Measured Sails, Imperial                                                                    Imp sq.ft             Metric sq.m
Mainsail                        241.53       SA= (Foot*2+MGM*3+1.5*MGU+MGT+.5*HW)*Luff/8                              Imp.     Metric         241.5                22.44
Luff / P                           29.50                                                                            29.50       8.992         247.0                 CTOA
Foot / E                           11.50                                                                            11.50       3.505      pro-forma CTOA
HW / MGH                             2.49    Head mainsail shall extend @ right angles not more than                  2.49      0.759
MGT                                  3.92    Maximum MGT (max 7/8 point girth) =                                      3.92      1.194 CTOA: Corsair Trimaran
MGU                                  6.39    Maximum MGU (max 3/4 point girth)=                                       6.39      1.948 Owners Association
MGM                                  9.25    Maximum MGM (max 1/2 point girth)=                                       9.25      2.819
MGL                                10.58     Maximum MGL (max 1/4 point girth) =                                    10.58       3.226
                                                                                                                                        Imp sq.ft             Metric sq.m
Jib - Largest                   117.58       SA= Luff * LP * .5                                                  120.51        43.80          120.5                11.20
Luff Length                        27.67     Maximum Luff =                                                          27.67     18.600         118.0                10.96
LPG                                  8.50    Maximum Overlap =                                                        8.50      4.710                     ISAF % of CTOA
Foot                                                                                                                  9.75      5.100       (max/min)-1               2%
Ft.roach + or -                                                                                                       0.25      0.000
Leach ( c )                                                                                                          24.50     17.150
Le.roach + or -                                                                                                       0.25      0.000
Lu.roach + or -                                                                                                      -0.15      0.000
Mid-Girth                                                                                                                       2.580
VLJ                                26.01     Jib Height = 0.94 * Luff.Length

                                                         as spin SF*(SLU+SLE)/4+(SMG-SF/2)*(SLU+SLE)/3           1003.6 135.44          Imp sq.ft             Metric sq.m
Screacher                       129.05       SA= Luff * LP * .5                                                       Imp.     Metric       1389.1               129.05
Luff                              22.250     Luff - head to tack maximum=                                            30.83     22.250        238.0                  CTOA
LP                                11.600                                                                             15.42     11.600
sle Screacher                     19.000     Leach                                                                   62.34     19.000                     as Spin % Larger
smg screecher                      6.800     Mid-Girth                                                               22.31      6.800 (max/min)-1                  322%
sf screecher                      12.200     Foot                                                                    40.03     12.200
                                             Mid-Girth / Foot > 50%                                                             55.7%
                                                                                                                                        Imp sq.ft             Metric sq.m
Asym.Spin.Large                 186.18       SA = (Luff+Leech)*(Foot + 4*Mid Girth) / 12                              Imp.     Metric       2004.0               186.18
SLU / Luff                        22.250     Head to tack (luff) maximum length =                                    33.17     22.250        477.0                  CTOA
SLE / Leech                       19.000     Clew to head (leech) maximum length =                                   26.92     19.000
ASF / Foot                        12.000     Tack to clew (foot) maximum length =                                    20.67     12.000
ASMG / mid-girth                  10.540     SMG =                                                                   18.67     10.540            88%
ISAF                             186.175     SA= (SLU+SLE) x .25 x ASF + (ASMG-.5ASF) x (SLU+SLE)/3

 Mainsail
 a) The HEAD shall be defined as the point of intersection of the line of the Luff, including the boltrope, and the highest point of the sail perpendicular to the
 Luff. The Head Width shall be measured from the HEAD.
 b) Luff is measured as the distance between two points along a line parallel to the sail Luff from which lines drawn at 90 degrees intersect the highest point
 on the HEAD or the lowest point on the Foot, respectively.
 c) The Foot is measured as the two farthest points along the Foot.
 d) The cross width measurements shall be taken from the seven-eighths, three-quarter, and one-half points on the Leech, located when the HEAD is
 folded to the Clew for the half height point, and when the HEAD is folded to the half height point to determine the three-quarter point. The seven-eighths
 point is located by folding the Head to the three-quarter point. Girth is measured as the shortest distance from Leech points to Luff, including the boltrope.
 Spinnaker
 e) For purposes of spinnaker measurement, the mid-girth shall be measured from the one-half point on the Luff to the one-half point on the Leech. These
 one-half points shall be found by folding the Head to the Tack for the one-half point on the Luff, and folding the Head to the Clew for the one-half point on
 the Leech. Measure around perimeters.
 Jib
 f) For purposes of headsail measurement, the Tack is defined as the point where the Luff and Foot, if extended, would intersect each other. The Head is
 defined as the point of intersection of the line of the Luff, including the boltrope, and the highest point of the sail perpendicular to the Luff. The Clew is the
 point where the Leech and Foot, if extended, would intersect each other.
 g) The diagonal (LP) is defined as the shortest distance from the Luff to the Clew.
 h) See ERS Diagrams ERS for Jib +or- Roach; measure at the maxi/min away from straight lines between corners. The mid-girth is measured by folding
 the Head to the Clew to find the mid-leech. The distance from the mid-leech to the closest point on the Luff is the mid-girth. The mid-girth is used in some
 classes as a size restriction.
 Screecher
 i) For purposes of Screacher measurement, the Tack is defined as the point where the Luff and Foot, if extended, would intersect each other. The Head is
 defined as the point of intersection of the line of the Luff, including the boltrope, and the highest point of the sail perpendicular to the Luff. The Clew is the
 point where the Leech and Foot, if extended, would intersect each other.
 j) The diagonal (LP) is defined as the shortest distance from the Luff to the Clew.



workbook: 98b016ed-e835-47ba-ab41-5b465fa3d35e.xls                                                                                                        www.sfbama.org
worksheet: How-To_Sail-Areas                                                                                                                                  page 9 of 9

								
To top