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How to Build a Fibreglass Jubilee



Plans For Fibreglass Jubilees


Construction Details in Fibre Reinforced Plastic

Centre Plate


Chafing Batten


Spars and Mast Fittings

Rigging Gear and Equipment


Yachts of Peculiar Construction and Evasions







1. Design


The original design is by Mr. Charles Peel and was of carvel plank timber construction and timber spars. In 1969 a referendum was conducted and the specifications subsequently altered to allow construction of hull and deck in Glass Reinforced Plastic and the use of aluminium alloy spars. However, the present rules still allow timber construction of all or part of the boat and reference should be made to the Association for governing rules.


2. Plans for Fibreglass Jubilees


Three plans comprise the set. The first of these plans shows the lines, the second the sail plan, and the third the constructional details including scantlings. The plans and these specifications are to be strictly adhered to, except that scantlings may, at the owner's option, be made heavier than those specified. If it appears that the plans and these specifications conflict, these specifications shall prevail, and be considered the true meaning and intention, and shall be abided by as such. But any constructional details or dimensions not set out in these specifications, but shown on the plans, must be adhered to.


3. Dimensions


The following and all other dimensions and measurements shall be strictly adhered to, subject to the margins of tolerance hereinafter allowed:


Length over all                5.49 m (18 ft. 0 in.)

Length load waterline   4.88 m (16 ft. 0 in.)

Beam - extreme             2.04 m (6 ft. 8 1/2 in.)

Draught                           0.40 m (1 ft. 4in.)

Sail area                          17.96 m2 (193.33 sq. ft.)


4. Construction Details in Fibre Reinforced Plastic



These specifications are to be read in conjunction with the original Specifications, Plans and Measurements; and with Sheet No. 4 of the Plans (Hull and Deck Construction in F.R.P.).

It is intended that the construction of the yacht in terms of this Specification shall be in Fibreglass reinforced polyester resin, but subject to the specific approval of the Jubilee Association Committee, construction may be carried out with other approved fibres and resins.

Surveyor: The manufacture of the yacht shall be subject to inspection by a Surveyor appointed by the Jubilee Yacht Association, who shall have access to the manufacturing area at all times when the yachts are under construction.




4.2.1. Fibreglass.

  1. All fibreglass reinforcement used in the construction of laminated parts shall be produced from "E" type glass filament with "Silane" or other approved finish. All filament used must conform with accepted commercial standards of composition, diameter, tensile strength and finish.

  2. Fibreglass mat shall be of densities 305 g/m2 (1 oz/sq. ft.), 455 g/m2 (1 1/2 oz/sq. ft.), and 610 g/m2 (2 oz/sq. ft.), having even fibre distribution and a binder-system which is readily and completely soluble in the approved resin system. Fibreglass mat shall be free of physical imperfections such as holes, "hard-thick" sections, bundles of unseparated ends of rovings and lumps of fibreglass and grease or oil.

  3. Fibreglass Rovings. Where laminates are to be produced from chopped rovings they must comply with the physical and chemical requirements of sections (a) and (b). In addition they must on cutting break into separate ends and disperse evenly.

  4. Woven Rovings shall be used in densities from 544 g/m2 to 813 g/m2 (16oz/sq. yd. to 24 oz/sq. yd.) as specified and shall comply with the physical and chemical requirements of sections (a) and (b). In addition they must be free of knots, tight selvedge loops, and shall be of a construction having minimum crimp.


4.2.2. Polyester Resins (Unsaturated). 


All resins used in the production of laminated parts and assembly operations shall be of orthophthalic, styrene-modified thixotropic type specifically suited for the construction of marine craft. Such resins must be used strictly in accordance with manufacturer's recom¬mendations (particularly with respect to shelf life and curing system). Fillers (other than thixotropic agents) may not be added and all laminating resin must be clear to facilitate inspection of laminates.


4.2.3. Gelcoats.


All gelcoats shall be formulated from approved resilient gel coat resins to specified colours. Pigments used shall have maximum light-fast¬ness combined with minimum inhibiting or accelerating effect. Gel coats applied to mould surfaces shall have minimum wax content to ensure adequate cross-linking with laminating resin. Gel coats applied to overlays or as finishing coats to laminated surfaces shall have adequate wax additive to ensure "tack free" curing.


4.2.4. Polyester Bonding Compound.


Where bonding compounds are required for the fixing of small components, or in assembly operations of laminated parts, these shall be formulated and mixed to suit specific requirements. In general, they shall be formulated from approved resins with an addition of approximately one part in four of medium length asbestos fibre. Where applicable, resins may contain approved flexibilizing agents.


4.2.5. Polyester Syntactic Filling Compound.


Where compounds are required for the filling of irregular shaped cavities or forming moulding fillets, these shall be formulated from approved resins with the addition of granulated cork, micro-balloons, or other approved low density fillers. Where required to improve the physical properties of the filling compound approved flexibilizing agents and/or asbestos fibre may be added.

4.2.6. Curing System for Polyester Resins.

In general curing systems will comprise cobalt naphthenate accelerator and methyl-ethyl-ketone-peroxide catalyst. Where indicated by the recommendations of resin manufacturers alternate catalysts, combined accelerator systems and approved inhibitors may be used. Where deemed necessary .tests shall be made to ensure that the activity of any one batch of catalyst is adequate to complete the Polymerization of the resins being used.


4.2.7. Laminate Cores.


  1. P. V. C Foam. Foam cored laminates requiring maximum compressive and surface bonding strength shall be constructed from closed cell grfted rigid P.V.C. foam of density approximately 32 kg/m3 (2 lbs. per cubic foot).

  2.  Polyurethane Foam. Foam cored laminates which are not highly stressed, or which require to be dressed to shape before laminating, shall be constructed from closed cell rigid polyurethane slabstock foam of density approximately 32kg/m3 (2 lbs. per cubic foot). Where irregular hull cavities require to be filled with polyurethane foam this shall be formulated, mixed and poured in place strictly in accordance with the recommendations of the raw material supplier. The resultant foam shall be free from large gas cavities and of a density not less than 40 kg/m3 (2.5 lbs. per cubic foot).

  3. Plywood. Plywood used as structural cores in laminates shall comply with A.S. 087- 1963-Type A, and be constructed from species to which polyester resin has adequate adhesion. Under no circumstances may plywood cores have surface veneers of coachwood or any other species which inhibit the cure of polyester resin.

  4. Timber. Timber cores for laminates shall be out of Jarrah or other approved species having similar physical properties. Timber cores shall be straight grained, free of large knots, gum veins, sap wood or other large defects and shall have a moisture content not exceeding 15 per cent. Any alternative timbers must have known non-inhibiting properties or be tested to establish their compa¬tibility with polyester resin.




All workmanship in laminating operations shall be of a uniformly high standard and shall be closely supervised by experienced laminators. Particular attention must be given to uniformity of laminates, thorough wetting out of fibres, correct resin-glass ratios, accurately controlled curing conditions, and neat finish.




4.4.1. Storage and Handling of Laminating Materials.


All materials used in the construction of laminates shall be stored under dry conditions. Under no circumstances may water, atmospheric condensate or inhibiting chemicals be allowed to contaminate fibreglass, polyester resins, or other materials used in the manufacturing process, and any such contaminated material must be rejected.


4.4.2. Laminating Area.


The laminating area shall be in a weatherproof, draught-free building and artificial heating must be available to ensure that all gel coats and resin mixes will gel in not more than one hour after application to moulds. Where artificial ventilation is provided to remove styrene fumes, care must be taken to avoid movement of air at the surface of the laminate.


4.4.3. Curing of Laminates.


Provision must be made for artificial heating to ensure that all laminates are adequately cured within the time specified by the resin manufacturer. Parts may not be removed from moulds until cured sufficiently to avoid subsequent distortion. The Barcol hardness measured prior to demoulding of the laminate shall be not less than 80 per cent of the resin manufacturer's value for the fully cured resin. Care must be taken to ensure that parts are not distorted by curing at excessive temperatures due to:

  1. excessive catalyst-accelerator-resin ratios.

  2. application of curing heat before the laminate has reached peak-exotherm temperature.




4.5.1. Materials.


All raw materials shall be made available to the surveyor for testing and approval.


4.5.2. Test Laminate.


A test laminate approximately 600 mm X 300 mm (2' X 1') shall be produced at the time of manufacture of each hull. It shall be suitably identified with the serial number of the hull. The Specifications of the test laminate shall be identical to the hull laminate, and it shall be produced in accordance with Australian Standard A.S.F.3 Appendix A.


4.5.3. Degree of Cure.


At the discretion of the surveyor completed mouldings may be tested for degree of cure by measurement of the Barcol Hardness. The tests shall be carried out in accordance with Australian Standard A.S.F.3. Appendix D.


4.5.4. Weighing.


The individual weights of each hull and deck, and the combined weight of each hull-deck assembly shall be recorded and supplied to the Surveyor.




4.6.1. Hull Shell.


Gel Coat:                     
0.3 mm - 0.45 mm (0.012" - 0.018")

305 g/m2 (1 oz./sq.ft.) Chopped Strand Mat
1847 g/m2 (6 oz./sq.ft.) Chopped Strand Mat or Chopped Rovings.
13 g/m2 (24 oz./sq.yd.) Woven Rovings.


4.6.2. Plate Case.


Gel Coat:             - 0.50 mm (0.015" - 0.020")

305 g/m2 (1 oz./sq.ft.) Chopped Strand Mat 
1847 g/m2 (6 oz./sq. ft.) Chopped Strand Mat or Chopped Rovings. 
25 mm (1") P.V.C. Foam boards laid vertically with webs at approx. 200 mm (8") centres

(Web Laminate: 610 g/m2 (2 oz./sq.ft.) Chopped Strand Mat returned at least 25 mm (1") on to base laminate and overlay laminate.)

610 g/m2 (2 oz./sq.ft.) Chopped Strand Mat or Chopped Rovings. 
813 g/m2 (24 oz./sq.yd.) Woven Rovings.


4.6.3. Hull Reinforcement.


610 g/m2 (2 oz./sq.ft.) Chopped Strand Mat or Chopped Rovings

1220 g/m2 (4 oz./sq.ft.) Chopped Strand Mat or Chopped


813 g/m2 (24 oz./sq.yd.) Woven Rovings.


4.6.4. Deck.


Gel Coat:                    
0.3 mm - 0.45 mm (0.012" - 0.018")

305 g/m2 (1 oz./sq.ft.) Chopped Strand Mat
1220 g/m2 (4 oz./sq.ft.) Chopped Strand Mat or Chopped Rovings
12.5mm (1/2") Balsa boards or 25mm (1") P.V.C. Foam boards laid transversely with webs at approx. 300 mm (12") centres.

(Web Laminate: 610 g/m2 (2 oz./sq.ft.) Chopped Strand Mat returned at least 25 mm (1") on to base laminate and overlay laminate.)

305 g/m2 (1 oz./sq.ft.) Chopped Strand Mat or Chopped Rovings. 
540 g/m2 (16 oz./sq.yd.) Woven Rovings. Overlay lamin¬ates to extend to extreme                                             edge of cockpit coaming and deck-edge flange.


4.6.5. Hull-deck Assembly.


5 mm X 12 mm (3/16" X 1/2") long Mushroom Head Alu¬minium Pop Rivets at 100 mm (4") centres (or equivalent fastening).

2 X 610 g/m2 (2 oz./sq.ft.), 90mm (3 1/2") wide Chopped Strand Mat Strip.

1 X 4880 g/m2 (16 oz./sq.ft.), 75 mm (3") wide Woven Rovings Strip.


4.6.6. Incidental Overlay Laminates 


Incidental Overlay Laminates of a non-structural nature shall be carried out with 610 g/m2 (2 oz./sq.ft.) chopped strand mat and one layer of 813 g/m2 (24 oz./sq. yd.) Woven Rovings (Hull) or 540 g/m2 (16 oz./sq. yd.) Woven Rovings (Deck).


4.6.7. Resin/Glass Ratios.


The fibreglass content of laminates should rang between 28 per cent and 33 per cent by weight, as indicated by the test method described in Australian Standard A.S.F.3 Appendix B.


4.6.8. Laminate Properties.


The physical properties of the completed laminates shall be capable of meeting the requirements of Type I Laminates as described in Australian Standard A.S.F.3.


4.6.9. Surface Finish.


The external surface finish of the hull and deck shall be the best possible consistent with the original quality of the moulds. The surface shall be free of surface defects incurred during manufacture including crazing, chipping, surface-abrasion and voids under gel coat.




4.7.1. Gel Coating.


All gel coats to specified formulation and colours shall be sprayed evenly on moulds and gauged to specified thickness. Gel coats may be sprayed by approved catalyst injection system or in the pre-catalysed condition. Where high atomising pressures are used, styrene monomer shall be added in correct quantity to replace losses in spraying. Curing conditions must be controlled so that gel coats are gelled within one hour of application to the mould.


4.7.2. Laminating.


Lay up of the laminate must be commenced after the gel coat has passed the peak exotherm stage but before it is fully cured. The first stage of laminating will in each case be a layer of 305 g/m2 (1 oz. per sq. ft.) chopped strand mat. The second stage shall be commenced immediately after gelation of the first stage and will include all layers up to the application of core materials.


Cores shall be coated with a thin layer of resin before being placed in position and shall be held firmly under load until the laminate has passed the peak exotherm stage. Overlay laminates shall then be applied in a single operation.


Joins in laminates must overlap at least 50 mm (2") and must not be located across lines of maximum stress. Joins in successive layers must be staggered at least 50 mm (2").


Care must be taken in laminating to maintain the required resin-glass ratio. The laminate must be thoroughly wetted-out, evenly laid, and free from voids and foreign particles.


4.7.3. Overlay Laminating.


The installation and overlay of internal structural and buoyancy components shall comply with the following:

  1. Accurate sizing and location of cores.

  2. Adequate preparation of overlay areas to ensure sufficient bond strength.

  3. Filling and fairing of all joints and corners to ensure complete and effective overlay.

  4. All overlays to extend a minimum of 38mm (1 1/2") on to adjacent laminates.

  5. Accurate fairing of pour-in-place foam prior to overlay.


4.7.4 Assembly.


The deck shall be accurately and neatly assembled to the hull with a fair sheerline maintained at all points. The joint shall be packed with Polyester Asbestos Compound prior to riveting, and subsequently laminated with the hull deck overlay.


4.7.5. Interior Finish.


The interior surface of the hull and deck shall be maintained in clean condition during manufacture and all rough, sharp projections, resin runs, loose fibres and other undesirable features removed. All interior surfaces shall be coated with interior gel coat to the required colour, and a thickness of approximately 0.25 mm (0.010").


5. Centre Plate


609 mm X 1118 mm (2 ft. X 3 ft. 8 in.), of steel, 6 mm (1/4 in.) thick. The method of lowering or raising the centre plate is optional, however, it must be such that a positive stop is provided to prevent the centre plate from being lowered more than 813 mm (2'8") below the keel.


The centre plate is to be a true rectangle. The two upper corners and the forward lower corner may be cut back in order to give more clearance in the centre -case, but the lower after corner (i.e., the lowest point when the plate is lowered) must not under any circumstances be cut.


6. Thwart


6.1 of Kauri or equivalent timber, 178 mm X 25 mm (7 in. X 1 in.)


7. Chafing Batten


7.1 Chafing battens shall be no more than 38 mm X 25 mm (1 1/2 in. by 1 in.)


8. Floors


8.1 The yacht to be fitted with floors consisting of 12 mm (1/2 ") thick marine plywood, carried on bearers of suitable strength to stand the weight of the crew.


9. Spars and Mast Fittings


9.1 Mast, boom and spinnaker pole may be of solid timber or extruded aluminium alloy section. Timber may be laminated.




9.2.1. Mast and boom according to the design. Spinnaker pole shall be not more than 2743 mm (9 feet) in length including end fittings, minimum diameter not less than 45 mm (1 3/4 in.) throughout the middle third and tapering fairly to not less than 38 mm (1 1/2 in.) at both ends.




9.3.1. Mast, boom and spinnaker pole shall be of section shown or available sections equal to or greater than those shown on the drawings. The mast may be tapered fairly over the top 2438 mm (8 feet) to a minimum dimension fore and aft of 44 mm (1 3/4 in.) and athwartships of 54 mm (2 1/8 in.).


9.3.2. All fittings on mast, boom and spinnaker pole shall be placed as shown on the drawings. Where fittings are not specified by the drawings they are completely optional. Where fittings are specified by the drawings they may be of material other than mild steel, but thickness and other dimension shall be such that equivalent strength is attained. Stock manufactured items may be used but any such fittings must be approved jointly by the measurer and the local controlling body and be of equivalent strength to fittings shown on the drawings.


9.3.3. All halyards must be external to the mast.


9.3.4. Revolving masts are not permitted.


10. Rigging Gear and Equipment


Shrouds, running stays and forestay shall have a nominal breaking strain of not less than 757 kg (1670 lbs). The top mast forestay shall have a nominal breaking strain of not less than 440 kg (970 lbs). Nominal breaking strain in accordance with BSS EN 58 J. Materials used for rigging are optional but 1 X 19 stainless steel wire rope of 3 mm (1/8 inch) diameter is recommended for all standing rigging except the top mast forestay which should be of 2.5 mm (3/32 inch) diameter.


Gear and equipment is optional, except that halyard and sheet winches, roller reefing gear, and jib furling gear, are not permitted. The position and method of attachment of shroud's forestays and running stays to the deck or hull are optional. The rake of the mast is optional. The only halyards permitted on the boat are as follows: 1 main halyard, 1 jib halyard, I spinnaker halyard, I Hag halyard, but a topping lift is optional. All sheets for trimming sails are optional in every respect.


11. Tolerances


As building to exact dimensions of structure subject to stresses is impracticable, variations from the designed dimensions not exceeding the following will not render a yacht ineligible for a Measurement         Certificate:                                                                                   

                                                                                     Under                       Over

Length over all                                                           12 mm (2 in.)            50 mm (2 in.)

Length on load water line                                        Nil                             Nil

Maximum beam                                                         20 mm (3/4 in.)        20 mm (3/4 in.)

Draught                                                                       Nil                             Nil

Frames position from correct centre                      12 mm (1/2 in.)         12 mm (1/2 in.)

Profile at any station                                                 20 mm (3/4 in.)        20 mm (3/4 in.)

Other dimensions not covered by this table         1%                              1%

                                                                                      Under                        Over

Height of upper black band above deck                 12 mm (1/2 in.)           12 mm (1/2 in.)

Height of spreaders above deck                               150 mm (6 in.)           150 mm (6 in.)

Height of running back-stays above deck              150 mm (6 in.)           150 mm (6 in.)

Height of mainstays above deck                              150 mm (6 in.)           150 mm (6 in.)

Height of jib forestay attachment                           50 mm (2 in.)             50 mm (2 in.)

Height of mast above deck                                       12 mm (1/2 in.)           12 mm (1/2 in.)


12. Yachts of Peculiar Construction and Evasions


Every measurer shall report fully to the supreme controlling body on any yacht which in his opinion, technically complies with these specifications and the plans, but which from any peculiarity of build or other cause in his opinion evades the spirit of them. The measurer's report shall be considered by the supreme controlling body, and if after due inquiry the supreme controlling body shall be of the opinion that the yacht evades the spirit of these specifications and the plans, it may direct the measurer not to issue any measurement certificate, and may refuse registration of the yacht concerned.


13. Flotation


All fibreglass Jubilee Yachts shall carry as a minimum, excluding all integral structural foam, flotation equipment of a volume calculated by the following formula:

V (Metric)    =                      Metric 
                           0.77W + 1.94We + 2.2B - 270 

V Imperial   =  0.35W + 0.88We + B - 270 

    V               = volume m3 (cu. ft.)
    Where W = dry weight of hull and deck assembly kg (lbs)

    We            =  952.56 kg – B - W (kg) (2,100 – B - W(lbs))

    B               = weight of ballast kg (lbs)

Density of flotation material used shall not exceed 64 kg/m3 (4 Lbs per cu. ft.) The minimum flotation equipment must be securely fastened and distributed under the deck in the following manner:

(a) That portion of the boat from the mast forward shall carry - 30%     

(b) From the mast aft to the forward edge of the centre thwart - 40%

(c) From the forward edge of the centre thwart to the transom - 30%


In order to take care of unusual circumstances the Official Measurer may permit variation of the above percentages. The flotation equipment must be distributed equally between port and starboard.

As an alternative to flotation equipment referred to above, two watertight bulkheads may be included as shown in the drawings. These bulkheads may be constructed either of 9.5 mm (3/8 in.) marine plywood or glass reinforced plastic as described in rule 4.6.1.

Bulkheads shall be sealed for their full perimeter to the hull and deck by overlay laminate in accordance with rule 4.7.3. Compartments enclosed by these bulkheads shall be completely watertight.


Penetrations other than access hatches in bulkhead hull or deck into the water-tight compartment may be made only if they are appropriately sealed by means of conduits by which gear and equipment may pass through the watertight compartment.

In any case the total face area of the penetration through a bulkhead other than access hatches shall not exceed .029 m2 (45 square inches). Similarly total face area of penetration through the hull or deck or into a watertight compartment shall not exceed .029 m2 (45 square inches) measured at the inside of the hull or deck.

Access hatches in hull or deck are not allowed.

Maximum dimensions of access hatches in bulkheads shall not be more than 500 mm (20 inches) wide and 355 mm (14 inches) high.


14. Sails


The mainsail, jib and spinnaker must be made from the following materials:

  1. Mainsail and jib either from Cotton or synthetic sailcloth of a weight not less than 235 g/m2 (seven ounces per square yard).

  2. Spinnaker either Cotton or synthetic sailcloth of a weight of not less than 54 g/m2 (one and one half ounces per square yard).


The width of cloths of all sails is optional.


Only one new suit of sails per sailing season is permitted to be used in recognised class racing. This suit of sails must be measured and registered by the Jubilee Yacht Association, or its representative and suitably labelled showing the date of its registration. A new boat shall be permitted two new suits of sails in the first year of its registration. In the event of a suit of sails or any one sail being damaged less than 12 months after registration to an extent which does, in the opinion of the Jubilee Yacht Association Committee, or its representative, render them unsuitable for racing, a new sail or sails may be registered for use.


Further specifications of the sails are as follows:


(a) Mainsail: Hoist 7390 mm (24 ft. 3 in.), Foot, 3660 mm (12 ft.) The luff shall be of rope; a wire luff is not permitted. The measurement across the head board at right angles to the luff must not exceed 108 mm (4 1/4 in.). If the sail is attached to the mast and boom by slides, these must not exceed 31 in number.

Three battens only are allowed spaced as per sail plan. Battens shall be no more than 100 mm (4 inches) wide and maxim urn lengths shall be as follows: top 500 mm (20 inches), centre 760 mm (30 inches) and lower 56 mm (22 inches).


Two lines of reefing pennons are allowed, spaced as per sail plan, or a Local Controlling Body supported by a three-fourths majority of local owners may rule that the inclusion of these reefing pennons in all mainsails within that territory is compulsory.


Mainsail must not be hoisted beyond a point 7390 mm (24 ft. 3 in.) above the tack bolt, this point to be marked on-the mast by a black band 25 mm (1 in.) wide, easily distinguishable from the deck. Mainsail must not be stretched out on the boom beyond a point 3657 mm (12 ft.) from the tack bolt, this point must be marked on the boom by a similar band. Distinguishing letters on the mainsail to be "J" and the registered number supplied by the supreme controlling body. The above number and letter may, where so decided by the local controlling body in whose waters the yacht races, be surmounted by the distinguishing letter of the club under whose colours the yacht races. The height of each letter and number shall be 300 mm (12 in.)


(b) Jib: maximum dimensions shall be: Luff 4877 mm (16 ft.), Leech 4572 mm (15 ft.), Foot 2286 mm (7 ft. 6'in.).The jib shall have a wire luff of 7 X 7 stainless steel flexible wire rope of 3.175 mm, (1/8") diameter or of equal or greater breaking strain.


Jib battens may be used but only two are allowed spaced as per sail plan. Batten pockets shall be no more than 38 mm (1 1/2 inches) wide and maximum lengths shall be 230 mm (9 inches).

Not more than 7 (seven) evenly spaced fastening devices shall be used to attach the luff of the jib to the forestry, and the maximum width of each such device shall be 50 mm (2").


(c) Spinnaker: Luff 5486 mm (18 feet), leech 5486 mm (18 feet), foot 3557 (14 feet), measured and constructed in accordance with plan and the instructions for measuring and specifications shown thereon. In order to ensure conformity in the shape of these sails, each local controlling body shall have the right to issue them, and may prohibit the use during races of any spinnaker not issued by it. No hanks or similar devices may be used to attach the luff of these sails to a forestay.


(d) Girths: The girths of all mainsails and jibs shall be measured in the following manner -

Mainsail: From a point half-way between the clew and the top of the headboard, to a point half-way between the tack and the top of the headboard.


Jibs: From a point half-way between the clew and the peak of the sail to a point half-way between the tack and the peak of the sail.


Girth of the Mainsail shall not exceed 2057 mm (6 feet 9 inches). Girth of the jib shall not exceed 1118 mm (3 feet 8 inches). Measurements to be taken on a floor with only sufficient pull between the above-mentioned points of measurement to eliminate wrinkles in the cloth.


(e) A transparent window is permitted in a sail provided it complies with the I.Y.R.U. Yacht Racing Rules, Addendum, on Sail Measurement.



2 plans for fibreglass
1 design
3 dimensions
4 construction
5 centre plate
6 thwart
8 floors
7 chafing
9 spars and mast
10 rigging
11 tolerances
12 yachts of peculiar
13 flotation
14 sails
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