International Mistral Class Organisation Limited 2001 IMCO Class Rules 1. GENERAL 1.1 The Mistral One-Design is a sailboard designed by Mistral Sports GmbH.. The objects of these Class Rules are: (i) To keep each board as equal as possible by rigidly maintaining the one-design features of the Mistral One- Design for class racing. (ii) To minimise cost to each competitor. (iii) To encourage the use of racing tactics and sailing skills rather than equipment to increase board speed. 1.2 Except where variations are specifically permitted boards of this class shall be alike in all respects. Any alternations or additional equipment, which are not specifically permitted by these rules, are prohibited. 1.2.1 Repairs and preventative maintenance may be carried out provided such repairs are made in such a way that the essential shape, characteristics or function of the original are not affected. This includes: a) filling the joint between the black Powerbox and the hull with resin to prevent the ingress of water; b) shimming the cassette box assembly in order to bring the gasket assembly closer together; c) Filling the joint between the back, long side of the slot flusher and the board; d) Sealing seams, deck inserts for footstraps & mastrack and any holes drilled either side of the centreboard slot with a suitable adhesive to stop the ingress of water. 1.3 The International Authority of the Class shall be the International Sailing Federation (ISAF), which shall cooperate with the International Mistral Class Organisation (IMCO) in all matters concerning these rules. 1.4 Interpretations of these rules shall be made by the ISAF, which in coming to its decisions shall consult the IMCO. 1.5 Amendments may be proposed by the ISAF after adoption by a simple majority of the delegate's votes in a general meeting of the IMCO. The IMCO and Mistral Sports GmbH shall have identical voting rights with regard to proposals to the rules. Amendments to these rules require approval of the ISAF before they become effective. 1.6 Neither the ISAF nor the IMCO accept any legal responsibility in respect of these rules or any claim arising therefrom. 1.7 English Language 1.7.1 The official language of the class is English and in the event of dispute over translation, the English text shall prevail. 1.7.2 The word 'shall' is mandatory and the word 'may' is permissive. 1.8 Licensed manufacturers The Mistral One-Design shall be manufactured by Mistral Sports GmbH or by other manufacturers appointed and licensed by Mistral Sports GmbH in consultation with the ISAF (hereinafter referred to as licensed manufacturers). 2. REGISTRATION 2.1 No person is permitted to race at an International Regatta unless they are a member of their National IMCO. If there is no National IMCO, then they must be a member of IMCO International. 2.2 Sail numbers shall be issued nationally (i.e. each country issues its own numbers). If their owner's National Authority is administering the Class, the owner shall apply to his/her National Authority for a sail number, otherwise he/she shall apply for a sail number to his/her National Mistral Class Organisation. 3. MEASUREMENT 3.1 Mistral One design boards are required to be measured before they are permitted to race. 3.2 For Olympic Qualification Regattas, Mistral One-Design boards & rigs shall comply with the IMCO Gold Standard Criteria and are required to be measured by an IMCO Chief/Class Measurer recognised by the National Authority and IMCO International before they are permitted to race.
3.3 Except where other methods of measurement are specifically indicated all measurements shall be taken in accordance with the IMCO Measurement Regulations for International Regattas and the ISAF Equipment Rules of Sailing. 3.4 Hulls and equipment shall measure in accordance with the measurement diagrams in these Rules. If there is a protest concerning measurement or if the race committee or the IMCO are doubtful concerning the correctness of an item or feature of a board for which specific dimensions, weight and/or construction are not stated, the following procedure shall be carried out: A random sample of ten boards or equipment shall be taken and measured using the same technique. The disputed board or item of equipment shall be accepted if it does not show any evidence of having been altered and if it has dimensions, weight and/or construction equal to, or between those, of the maximum and minimum criteria specified in the Gold Standard and/or obtained from the sample of ten boards or items of equipment. If there is evidence of an alternation having been made or if the dimensions, weight and/or construction are not equal to, or between those of the maximum or minimum criteria specified in the Gold Standard and/or obtained from the sample of ten boards or items of equipment the matter shall be referred to an IMCO International Approved Class Measurer for a final decision. 4. IDENTIFICATION MARKS 4.1 The board shall carry the serial number issued by the licensed manufacturer, in a readable condition and located either just behind the towing eye on the bow or behind the centreboard well on the stern. 4.2 The sail shall carry the sail number and in international competition the owner's national letter(s) in accordance with RRS 77. The colour of the sail numbers and national letter(s) shall be black, clearly readable. 4.3 The sail number, national letter(s) and the class emblem shall be placed as laid down in RRS Appendix H as specified for craft under 3.5 metres in length. 5. BOARD 5.1 Hull 5.1.1 The hull shall be produced by a licensed manufacturer in accordance with the plans and specifications of Mistral Sports GmbH, approved by the IMCO/ISAF. 5.1.2 Hulls shall be produced only by using moulds made from the master plug in the possession of Mistral Sports GmbH. 5.1.3 Painting the hull is not permitted except; a) The deck grip may be restored to it s original condition with a clear coating so that the original deck and graphics of the hull can be clearly seen; b) the hull may be painted only in the area of a repair provided the serial number remains legible; c) Rubbing down the bottom and deck surface using wet & dry abrasive material is permitted in order to restore it to it s original condition 5.1.4 Damaged areas of the hull moulding may be repaired to the original fairlines. 5.1.5 A maximum of 11, minimum of 6 footstraps, which have been produced for the Mistral One-Design by a licensed manufacturer, shall be fitted using the existing inserts. a) Any stainless steel screws & round washers with a maximum diameter of 17mm may be used. b) Cutting and taping of the footstraps is permitted. c) Extra holes in the footstraps may be made. d) A footstrap shall be fitted with at least one screw at each end. e) The Long Light Foam beating strap shall count as two footstraps if fitted with at least one additional screw in the middle. 5.1.6 The centre of gravity of the board shall be taken with the board set up as it is intended to race The Mast track car shall be at the back of the mast track.
5.1.6.1 The centre of gravity of the board shall be between 158cms and 163cms inclusive from the Hull Datum Point (HDP) 5.1.7 The mast track shall be produced by a licensed manufacturer for use with the Mistral One-Design. 5.1.7.1 The track pedal may be locked. 5.1.7.2 Lubricant may be used within the mast track & on the car. 5.1.8 The recessed area aft of mast track pedal may be filled. 5.1.9 The slot gaskets shall be produced by a licensed manufacturer and may be repaired with glue or proprietary self adhesive tape which may also be fitted over the forward short edge of the two gaskets. 5.1.10 Not more than two pieces of foam may be used in the aft half of the centreboard slot to reduce movement. Each piece of foam shall not be more than 100mm in dimension in any direction. 5.1.11 The centreboard cassette shall be produced by a licenced manufacturer for use with the Mistral One Design. and may be shimmed The shimming material may not be fixed to the hull. 5.1.11.1The white stopper in the front of the cassette box at the bottom shall be firmly glued in place. 5.1.11.2 Competitors may shim their slot flusher assembly in order to bring the gasket assembly closer together. 5.1.11.3 Competitors may fill the joint between the backside of the slot flusher and the board. 5.1.12 A strap produced for that purpose by a licenced manufacturer for use with the Mistral One Design may be fitted over the aft half of the centreboard well to combat over-rotation.. 5.2 Centreboard 5.2.1 The centreboard shall be produced by a licensed manufacturer in accordance with the plans and specifications of Mistral Sports GmbH, approved by the IMCO/ISAF. 5.2.2 The centreboard shall be installed and if necessary a deck stopper may be fixed in the head (not in the horns) so that it cannot extend more than 640mm below the underside of the board and more than 1420mm from the Hull Datum Point (HDP) 5.2.2.1 Deck stoppers shall be made of material strong enough not to bend under racing conditions and be fitted with a hard covering that is glued in place so that either is impossible to remove. 5.2.2.2 Competitors shall allow a 5mm tolerance in the HDP measurement as specified in Class Rule 5.2.2 so that when going out to race the maximum dimension should not exceed 1415mm. 5.2.3 The centreboard shall float. 5.2.4 The centreboard may be repaired to its original designed shape and specification. 5.2.5 The centreboard shall weigh between 1.2 Kgs and 1.4 Kgs. 5.2.6 Lubricant may be used within the centreboard cassette and on the centreboard buttons. 5.3 Skeg 5.3.1 The skeg shall be produced by a licensed manufacturer in accordance with the plans and specifications of Mistral Sports GmbH, approved by the IMCO/ISAF.. 5.3.2 The skeg shall comply with the measurements shown in Figure 2. and shall weigh between 0.550 Kgs and 0.600 Kgs. 5.3.3 The skeg may be repaired to its original designed shape. 5.3.4 The sides of the skeg may be shimmed within the skeg box to reduce skeg movement. 5.3.5 Competitors may fill the joint between the black Powerbox and the hull. 5.4 Weight 5.4.1 The bare hull including mastrack, centreboard cassette, foam centreboard retaining pads (Art 5.1.10), gasket assembly and gaskets only shall have a minimum weight of 15kgs in a dry condition. 5.4.1.1 The Racing Weight is defined as the hull including fittings specified in Art 5.4.1, plus corrector weights, footstraps and skeg only and may be established by weighing the hull wet as prescribed in Art. 5.4.1.2. 5.4.1.2 The hull may be weighed wet after a minimum of 10 minutes draining standing vertically on the Hull Datum Point.
5.4.3 Hulls under the minimum weight shall carry corrector weights securely fixed in positions that ensure the centre of gravity of the hull is within the dimensions specified in Art 5.1.6.1 and that are approved by an IMCO International Class Measurer. 6. MAST 6.1.The Mistral One Design two piece carbon fibre mast shall be produced by a licenced manufacturer in accordance with the plans and specifications of Mistral Sports GmbH, approved by the IMCO/ISAF 6.2 The mast may be lengthened using a Mast Extension produced by a licensed manufacturer of the type shown in Figure 3. Competitors may shim their Mast Extension with proprietary self adhesive tape 6.3 The mast spigot section may be shimmed with proprietary self adhesive tape 7. BOOM 7.1 Any type of boom that is produced by Mistral Sports GmbH or a licenced manufacturer for the Mistral One Design, and is approved by the IMCO/ISAF is permitted. 7.2 The overall width of the boom shall not be greater than 650mm. The overall length of the boom excluding extensions shall not be greater than 1930mm as measured from the inside of the cup, which houses the mast at the front end. 7.3 The boom may be lengthened by using an extensions produced by Mistral Sports GmbH or a licensed manufacturer. 7.4 Four extra holes may be drilled through the plastic into the Aluminium at the boom back end for drainage purposes, and to fix adjustable outhaul fittings. 7.5 Competitors may roughen the surface of the boom grip using abrasive material.
8. CONTROL LINES AND FITTINGS 8.1 The downhaul and outhaul lines and fittings supplied with the board may be replaced with the competitor s own adjustable downhaul and outhaul systems whose manufacturer is optional. A tack strap/inhaul is not permitted. 8.2 The manufacturer of replacement fittings, other than where specifically mentioned in the rules is optional. 8.3 The manufacturer and length of the ropes (lines) used are optional. 8.4 A harness and harness lines are allowed. 8.5 Any uphaul may be used 9. SAIL 9.1 The sail shall be a Mistral One-Design Race Sail 7.4m2 or 6.6m2 produced by Mistral Sports GmbH or a licensed sailmaker in accordance with the Sail Specification approved by the ISAF. The nominal dimensions of the One-Design Sails are shown in Figures 6 and 7. 9.2 The battens shall be produced by a Mistral Sports GmbH or a licensed producer specifically for the Mistral One-Design in accordance with the Sail Specification approved by the ISAF, except. a) Competitors shall use the grey Robichaud No 4 batten. b) And National IMCOs may allow other battens for non-international events within their jurisdiction. 9.3 Repairs to the One-Design Race Sails are permitted only within the tolerance of the Sail Specifications and, when necessary (see Art 3.1), the IMCO Gold Standard Criteria. 9.4 Transparent plain self adhesive mono-film reinforcement patches to the sail to prevent damage are allowed to the area on either side of the sail which is chafed by the boom only. 10. ADDITIONAL CONDITIONS WHICH APPLY WHILE RACING 10.1 When the Safety System is in force, a towrope of minimum length 5 metres and a thickness of 5mm shall be carried. 10.2 It is recommended that a safety line or device should secure the mast to the board to prevent the rig being separated from the board. 10.3 if pumping becomes the main method of propulsion, the race shall be abandoned. 10.4 International Regattas 10.4.1 No more than 3 races per day may be scheduled/raced. (See Art 10.4.3 & 4) 10.4.2 The elapsed time for a course race should be between 40 and 45 minutes for the winner. In non-planing conditions this should be reduced to approximately 30-35 minutes. Where the elapsed time for a race is likely to extend to be significantly longer, it shall be shortened appropriately. 10.4.3 No more than 2 races per day shall be sailed in non-planing or marginal planing conditions. A third race may be sailed if a) The first two races were sailed in planing conditions; or b) One of the first two races was sailed in planing conditions, and planing conditions exist constantly before the start of the third race. 10.4.4 When racing back to back a) In non planing or marginal planing conditions, the minimum interval between the closing of the finishing line and the new warning signal for that fleet/division shall be 25 mins. b) In planing conditions, the minimum interval may be reduced to 20 minutes..10.4.5 If two races have been sailed back to back there shall be a rest period of a minimum of one hour ashore except in cold weather conditions, for the last finisher per fleet/division in the second race before the warning signal for the third race for that fleet/division. 10.5 If personal buoyancy is prescribed, every competitor shall wear, above the waist, a jacket, harness or vest with a minimum buoyancy of 4kg un-inflated, in fresh water. The buoyancy shall be tested with a metal weight of 4kg,
which shall remain supported for a minimum of 5 minutes. Personal Buoyancy shall not weigh more than 1.5kgs when wet, weighed in accordance with RRS Appendix J. 10.6 For a regatta series not more than two rigs plus one centreboard, skeg and one hull may be used. A rig shall consist of a sail, battens, a mast, a set of booms and associated hardware. The sail of each rig shall be of a different size as defined by Class Rule 9.1. 10.7 When changing to a rig with a different size sail, the competitor must obtain the new rig and return the old rig, at the same time, at the board and equipment storage area. The board and equipment storage area shall be ashore in the vicinity of the launching area unless otherwise stated in the Sailing Instructions. 10.8 If authorised equipment is damaged or stolen during a regatta series it may be substituted only with the approval of the Jury when the Jury is satisfied that repairs are not possible in the circumstances. In the event that a sail is replaced it shall only be replaced with another sail of the same size. 10.9 When the equipment is supplied for an event by the event organiser, the Notice of Race shall state which items of equipment shall be supplied including the number & type/size of footstraps and rigs. Notwithstanding this list of supplied equipment, the competitor may substitute or use in addition, any or all of the equipment scheduled in Appendix 1. Otherwise only the supplied equipment stated in the Notice of Race, shall be used for the event. 10.10 At IMCO World & Continental Championships, competitors may be required to carry advertising in compliance with RRS Appendix G. 10.11 Fleet Sizes a) Where there are 70 or fewer competitors entered in a class/division, they shall race together in One Fleet. b) Where there are between 71 and 80 competitors entered in a class/division, the Class Race Management Consultant shall decide whether they will race in One Fleet or whether there will be a "First Round" followed by a "Final Round". c) Where there are more than 80 competitors entered in a class/division, they shall race a "First Round" followed by a "Final Round". d) Competitors racing in a First Round shall be divided into two equal Groups of roughly equal ability, according to a seeding list based on -Their Sailor Values (SV) specified in the current IMCO Yearbook. -Competitors having the same SV shall be ranked according to their position on the current ISAF World Ranking List. - The competitor with the highest SV (10) will head the Seeding List - The competitor heading the seeding list shall initially be in the first Group ; competitors in 2 nd & 3 rd shall be in the second Group ; competitors in 4 th & 5 th shall be in the first Group ; and so on. The first group shall be designated the Yellow Group and the second the Blue Group. e) The decision of the IMCO Race Management Consultant is final. 10.12 Number of Races a) The maximum of races that can be scheduled in a Series (or a First Round and a Final Round ) is 12. 10.13 Discards a) When racing in a series, there shall be one discard after 4 races have been completed and a further discard after 11 races have been completed. b) When racing in Groups, one discard shall be allowed after four races have been completed in the First Round. This discarded race result from the First Round may be substituted with a worse race result from the Final Round. c) When racing a Final Round, one additional discard shall be allowed when the sum of the races completed in the First Round and the Final Round is 11 or more. d) When Article [c] above applies, one discard shall be taken from the First Round and one discard shall be taken from the Final Round.
10.14 Jockey Colours a) Competitors not carrying ISAF Category C advertising as specified in RRS Appendix G. Art 3.1(d ii) and 3.2(b) shall carry Jockey Colours on their sail sails in an unrestricted area except with respect to Appendix H. b) The number of colours and the colours used in the Jockey Colours design is optional however each finished design shall be unique and shall be registered with IMCO International before January 1 st each year. c) A competitor may only register one design. 10.15 Identification In events where the Organising Committee specifies the use of identification of division the identification shall be displayed on the sail above the Class insignia. The minimum height of the display shall be 230mm. The divisions and displays shall be: Olympic Fleet competitors Black Square plus IMCO Men Heavy Black Circle IMCO Men Light Black 1/2 Circle IMCO Women Red Diamond IMCO Youth Black Triangle
Appendix 1 Equipment that may be supplied by competitors The following is a schedule of equipment that competitors may supply within current IMCO Class Rules. The manufacturer of each item is optional 1. Sandpaper and clear non-slip for improving traction on the deck. (Class Rule 5.1.3) 2. Proprietary self adhesive tape for footstraps, shimming of mast spigot & mast extension, gasket repairs and over forward short edge of the two gaskets. ( Class Rule 5.1.5, 5.1.9, 5.1.11, 6.3 & 9.6 ) 3. Additional screws & round washers of a maximum diameter of 17mm not supplied by the manufacturer, including extra long screws for fixing overlapping footstraps. ( Class Rule 5.1.5 ) 4. Materials for filling the back of the mast track. ( Class Rule 5.1.8 ) 5. Glue to mend gaskets. (Class Rule 5.1.9) 6. Foam for centreboard case, ( Class Rule 5.1.10 & 5.1.10.2) 7. Solid metal rod cased in rubber tube centreboard stopper and associated deck protector pads each with a maximum dimension of 20mm in any direction. (Class Rule No. 5.2.2 ) 8. Materials to repair the centreboard and skeg, ( Class Rules No. 5.2.4 & 5.3.3 ) 9. Lubricant for mast track & centreboard cassette. ( Class Rule 5.1.7.2 & 5.2.6) 10. Corrector Weights for the hull (Class Rule 5.4.3) 11. Complete set of adjustable downhaul and outhaul equipment including lines, jam cleats, pulleys, shock cord, tape and boom clamps. (Class Rule 8.1) 12. Harness lines and fixings. (Class Rule 8.2) 13. Transparent plain self adhesive mono-film reinforcement patches to the sail to prevent damage ( Class Rule No. 9.5) 14. Shimming materials for Centreboard cassette box and fin. (Class Rule 5.1.11 & 5.3.4) 15. Any style of Uphaul 16. Super glue to seal the seams of the board
17. Mast foot protector 18. Lubricant to camber inducers
Appendix 2 Mistral One Design 2000 Class legal Equipment Identification Schedule The Mistral One Design 2000 carries the following identifying marks or unique characteristics. Hull Shape Identification Centreboard Cassette box Identification: Centreboard Shape Identification Skeg Shape Identification: Mast Identification: Short Mast Foot Extension Mast base (as per Figure 3 Mast Foot Extension) Branding: Sail Design Drawings (Figures 6 &7) Unique Bank Note Identification Branding: Serial Number & One Design 2000 Branding Four fixing screws visible on deck Mistral stamp Red strands, Moulded Serial number & IMCO Stamp Red strands & White in colour One Design 2000 Branding Red strands in/on each section Engraved Serial Numbers in/on each section Mistral One Design 2000 Label on bottom section Mistral Label Mistral One Design 2000 Label Battens for 7.4m sail Identification sticker: Bar Code/Mistral One Design 2000 Individual battens numbered 1 > 5 Colour Pultruded Natural Polyester Resin Except No.4= Grey laminated Robichaud Boom Wall thickness/plastic & Aluminium types Branding: Mistral One Design 2000 Branding
Appendix 3 IMCO Gold Standard Criteria To meet the Gold Standard Criteria specified in Class Rule 3.1, competitor s equipment shall comply with the following dimensions/weight tolerances as measured using the IMCO Measurement Methodology for One Design Equipment to be used at the 2000 Olympic Regatta and shall carry the specified identification. Hull Centre of Gravity 160>165 cms from HDP (CR 5.1.6.1) Bare Hull Weight Min 15 kgs (CR 5.4.1) Identification: Shape, serial Number & One Design 2000 Branding Centreboard Shape Template Weight 1.200 > 1.400 Kgs (CR 5.2.5) Maximum Extension: 640mm (CR 5.2.2) Maximum Dimension from HDP: 1420mm (CR 5.2.2) Bank Note Identification: Shape, Red Strands, Moulded Serial Number & IMCO Stamp Centreboard Cassette box Identification: Four fixing screws visible on deck Mistral stamp Slot Gaskets Identification: Tube type Skeg Weight 0.550 > 0.600 Kgs (CR 5.3.2) Identification: Red Strands, Power box type & White in colour; One Design 2000 Branding Shape Template Mast Bank Note Identification: Pre- Bend mm 30kg Bend mm. Top length Red Strands within two piece carbon fibre mast ; Engraved Serial Numbers on each section Mistral Label on bottom section Bottom Length Weight Min. Top Middle Bottom Top Middle Bottom cms cms Kgs 5 5 3 130 150 90 257.5 233.5 2.40 16 18 11 160 190 112 260 236 Short Mast Foot Extension Weight including power joint excluding ropes. Identification: 7.4m One Design 2000 Sail Identification: 0.62 > 0.73 Kgs Mistral label Mistral One Design 2000 label Templates
Dimensions: As specified in Appendix 4 7.4m One Design 2000 Sail Battens Colour Pultruded Natural Polyester Resin Except No.4 = Grey laminated Robichaud Identification Sticker Bar code/mistral OD 2000 Batten No. 4 Length 206cms inc. black end stops Correct positioning in sail (No 1 = Top Batten > No 5 = Bottom Batten) as numbered
6.6m One Design 2000 Sail Identification: Mistral One Design 2000 label Templates Dimensions: As specified in Appendix 4 6.6m One Design 2000 Sail Battens Colour Pultruded Natural Polyester Resin Identification Sticker Bar code/mistral OD 2000 Correct positioning in sail (No 1 = Top Batten > No 5 = Bottom Batten) as numbered Booms for 7.4m & 6.6m Sails Width > 650mm Max Width Length (excluding extensions) > 1940mm Max Length Identification: Mistral One Design 2000 Design Drawings lodged with the ISAF Wall thickness/plastic & Aluminium types
Appendix 4 IMCO Gold Standard Criteria Sail Measurement Tolerances RIG 1 - Sail One Design 2000-7.4m2 See Figure 7 One Design Race Sail Cord Leech Foot Bat. 2 Bat 3 Bat 4 H > T H > C C > T 4985mm 4160mm 2305mm 1345mm 1785mm 2125mm 4940mm 4135mm 2280mm 1325mm 1765mm 2105mm RIG 2 - Sail One Design 2000-6.6 m2 See Figure 6 One Design Race Sail Cord Leech Foot Bat. 2 Bat 3 Bat 4 H > T H > C C > T 4705mm 3800mm 2300mm 1255mm 1680mm 2085mm 4675mm 3780mm 2280mm 1235mm 1660mm 2065mm 1. Measurements shall be taken with the sail set up as defined in the attached Measurement Methodology & from the following points: a) Head Point The intersection of the highest point of the sail & mast sleeve; b) Clew Point The intersection of the foot & the leech outside the clew cringle; c) Tack Point The lowest point of the foot below and to the right of the tack cringle; d) Batten 2/3/4 - The intersection of the centre line of the batten pocket & the leech (you will need to lift the batten tension strap and apply a reasonable pressure) - The intersection of the extension of this centre line & the outside edge of the mast sleeve which is pulled and flattened. NB. Even if the sail measurements have fallen within the specified measurement tolerances, the measurer may reject the sail if there is any evidence of recutting or restitching
Appendix 5 Measurement Methodology for Mistral One Design Equipment to be used at The 2000 Olympic Qualification Regattas & the 2000 Olympic Regatta. A. Introduction The following procedures have been devised so that they do not require expensive and/or sophisticated equipment. If the measurer is in any doubt as to the legality of an item of a competitor s equipment, they should refer to Class Rule 3. B. Measurement Equipment Supplier 1no. Suspension weighing machine, capacity 30kgs, resolution 0.01kgs, LOA 1no. Webbing split strap 1800 mm in length LOA 1no. Hoisting Frame 2.5m high, 2m wide, capacity 100kgs LOA 1no. Table top weighing machine, capacity 15kgs, resolution 0.01kgs, LOA 3no. Table (2m x 1m x.70m high) LOA 4no. Saw Horses (Trestles - 90cms High x 1m wide) LOA 1no. Sail Measurement Table (5.5m long, 3m wide, 0.70m High) LOA 4no. Wood end support blocks (Triangular 90cms long x 45 mms x 45 mms) LOA 2no. Lengths of Broom stick (the width of the trestles) LOA 1no. Large roll of duck tape IMCO 2no. Rolls of masking tape IMCO 2no. Waterproof Ink Pads LOA 1no. Official Event Stamp LOA 1no. Chinagraph pencil IMCO 2no. Mistral OD Masts IMCO 1no. Mast Tip Cap with 5 metres of fishing line attached IMCO 1no. 5meter steel tape measure IMCO 1no. 30cm steel ruler IMCO 2no. 20 litre plastic kegs with handles LOA 1no. Length of line with which to tie the kegs together/ hook them on the mast LOA 1no. Builders spirit level (Min 60cms in length) IMCO 1no. Micro Adjustable Vernier steel callipers to measure batten thickness IMCO C. Measurement Area The measurement area shall be a minimum of 10m. square and well protected from the sun, rain & wind. Please note that the weighing machines must be located where the air is still. Access to the whole area should be restricted by barriers. The area should have a hard, level floor if possible. Failing this, each piece of equipment shall be fixed in a level position to the satisfaction of the IMCO Approved Class Measurer. D. One Design Mast The biggest variation in mast performance may be traced to the pre-bend, the tightness of the mast sleeve and the straightness of the spigot. The speed of the mast flex memory is also a factor but is very difficult to measure and is not as significant to performance as flex under load. Set-Up (Allow one hour if inexperienced) Pre-bend i. Separate a top and bottom mast section to be measured ii. Set two Wood end support blocks (Triangular 90/45/45) horizontal & parallel to each other and on a hard level surface so that the top section of the mast is supported at both ends without touching the ground. It should overhang the end support blocks by 100mm.
iii. Repeat the same set up for the bottom section. The top of the bottom section (The end with the spigot) should have the spigot on the end support block (above the Aluminium ring) Mast Measurement Set-up iv. Open the trestles and fix them parallel and, at the midpoint, 4680 mm. apart on a hard level surface. v. Place one section of Broom Stick on the top of each trestle and tape them into position. vi. Mark the mid-point position on the Broom Stick s so that measurements can always be taken from these same points. (Point X on one trestle and point Y on the other)
One Design Mast (Cont.) vii. Take two Mistral OD Masts and place one on either side of each trestle top and parallel, making sure that they rest on points X & Y, with the top mast overhanging point X by 100mm. Tape in position. ( This should ensure that the measurement of 468 cms remains the same for the duration of the regatta) Methodology Pre-bend i. Individually roll the top & Bottom sections on the rails to find the point of the greatest sag or pre-bend. ii. Mark the top of the mast at that point and where it will butt up against the bottom section and do the same on the bottom section. Pre Measurement iii. Fill the plastic kegs with water, tie them together and fix the hook then weigh on the Suspension Weighing machine so that they weigh 30kgs. iv. Take the two sections of the mast to be measured and join them together making sure that the Maximum Pre-Bend Marks 1 & 2, previously made, are butted up together. v. Mark the mast 100mm down from the top edge of the mast (Not from the top of the plug in the top of the mast) and on the reverse side from the Maximum Pre-Bend Marks. This point is now point A and must remain over point X for the duration of the test. vi. Place the complete mast on the trestles, making sure that point A rests directly above point X and that the Maximum Pre-Bend Marks are uppermost allowing the mast to sag to its maximum. vii. Measure 1170mm down from point A three times so that the mast is divided equally into four between points X & Y. You now have three measurement points on the mast now named, from the top, 1,2 & 3. viii. The last measurement down the mast from point 3 should coincide with point Y initially. Mark the mast at this point and name it point B. ix. Secure a line to a cap and fit the latter over the tip of the mast so that it gives a consistent fit enabling it to be fitted in exactly the same way each time, thus allowing the line to lay the same way each time. x. Tension the line along the uppermost surface of the mast. Mark the line above points 1,2,3 and B. Maintain the same tension on the line by bending it over the mast base and applying pressure on the angle. (Protect this point on the line by applying tape). Press the line down on to the mast at points A & B for all mast measurements. Measurement (approx. 3 minutes per mast) xi. Ensure that you have the competitor s Measurement Control Form and fill in the dimensions of the top and bottom sections and the part number/date of manufacture ensuring that you can see the bank note identification. xii. For the maximum Pre-bend Measurement, Take the 30cm steel rule and measure from the underside of the line (point vii above) and down perpendicularly to points 1,2 & 3 on the mast. Care should be taken to measure to the nearest millimetre. Note the dimensions. xiii. For the 30kgs bend measurement, hang the pre-weighed water kegs on point 2 (The centre of the mast), making sure that the Maximum Pre-Bend Marks 1 & 2 are uppermost and that point X & A are lined up at all times, then measure down as before. E. Mistral One Design Board (Centre of Gravity & Weight) Set-up for Centre of Gravity Measurement i. Place one Wood End Support Block on a table near and parallel to the edge. Ensure that the top edge of the block has a groove big enough to house the tab on the end of the measuring tape. ii. Ensure that the board is carrying a fin, footstraps (as intended to race), no centreboard cover and no centreboard. The mast track car must be right at the back of the mast track. ( If it is of pre- 97 manufacture, the fin should be central in the fin box)
iii. Ensure that the Suspension Weighing machine ( the official scales) reads zero with the split strap, in position. Weighing & Pre-Centre of Gravity Measurement. iv. First weigh the board with the fin, footstraps (as intended to race), no centreboard cover and no centreboard. (No power joint) Refer to the Footstrap Weight Table for a guide to the bare hull weight. (See elsewhere in the Yearbook)
Mistral One Design Board (Centre of Gravity & Weight) cont v. The weight of the footstraps and fin varies according to the combination of straps selected and whether they are wet, damp or dry. The minimum class legal weight of the bare board is 15kgs. (see CR 5.4.1) vi. If the measurer considers that the board may be underweight, he should request that the competitor remove all the footstraps and the fin so that the board can be re-weighed. Add corrector weights if necessary. Methodology vii. Ensure that you have the competitor s Measurement Control Form and fill in the board s serial number and the number, type, positions of the footstraps being registered. Check that the footstraps are fitted correctly. viii. Ensure that the board is carrying the fin, footstraps (as intended to race), no power joint, no centreboard cover, no centreboard and the mast track car is right at the back of the track. ix. Fix the tab of the measurement tape in the top edge of the Wood End Support Block in a way that will allow you to measure the distance to the stern of the board. x. Place the board on the Wood End Support Block with the pivot just behind the balance point (Centre of Gravity), the bow over the table and the stern hanging in the air. The balance point should be close to the mast track pedal. xi. Adjust the board for and aft so that the spirit level, placed directly above the balance point (Centre of Gravity) is level. xii. Finely adjust the board on the balance point so that, when the stern is depressed by approx. 50mm, it just returns to the horizontal. xiii. Measure the distance from the balance point to the stern. xiv. If the balance point (Centre of Gravity) of the board is outside the Gold Standard band for whatever reason, the competitor must add or adjust the weights the board is carrying before repeating the test to ensure that it complies. F. Battens There are variations in the general stiffness of the battens due to the variations of glass content or stiffness of the resin. These are too difficult to control during the manufacturing process and the amount of race performance difference compared to the amount of time needed to measure the battens under load is not worth the effort. Control of these variations is too complicated at this time. Please see the current Gold Standard Rules for information on which battens may be used with the One Design 2000 7.4 or 6.6 Race Sails. G. Sail Area The Gold Standard Rules & Tolerances specify Measurement Tolerances for the Mistral One Design 2000 7.4 & 6.6 Race Sails. 1. Sails are to be measured with the camber inducers and battens removed 2. The competitor shall bring the battens and camber inducers with the sail so that you can check they are the correct ones for the particular sail and mark them accordingly. 3. Lay the sail out on the table with the luff sleeve on the left hand side and the clew to the right looking from the foot and. a) fix the head with a spike through the top of the mast sleeve webbing; b) fix the clew with a spike through the clew cringle ; c) and fix the foot with a spike through the webbing at the lowest point of the foot. This position is just below the tack cringle and to the right. d) The whole sail should be under tension so that as many wrinkles as possible are removed prior to measurement. The measurer may need to bring some strength to bear. 1. Measurements shall be taken from the following points
a) Head Point The intersection of the highest point of the sail & mast sleeve; b) Clew Point The intersection of the foot & the leech outside the clew cringle; c) Tack Point The lowest point of the foot below and to the right of the tack cringle; d) Batten 2/3/4 - The intersection of the centre line of the batten pocket & the leech (you will need to lift the batten tension strap and apply a reasonable pressure) - The intersection of the extension of this centre line & the outside edge of the mast sleeve which is pulled and flattened. 2. Please note that even if the sail measurements have fallen within the specified measurement tolerances, the measurer may reject the sail if there is any evidence of recutting or restitching
MEASUREMENT AREA PLAN