INTERNATIONAL Recognized by: ONE METRE CLASS RULES 2015

The One Metre class was developed by the IMYRU Permanent Committee and was adopted as an international class in 1988

Index C.3 Advertising Introduction C.4 Boat C.5 Hull PART I – ADMINISTRATION C.6 Hull Appendages Section A – General C.7 Rig A.1 Language C.8 Sails

A.2 Abbreviations Section D – Hull A.3 Authorities and D.1 General Respons ibilities D.2 Hull A.4 Administration of the Class A.5 ISAF Rules Section E – Hull Appendages A.6 Championship Rules E.1 Parts A.7 Sailing Instructions E.2 General E.3 Keel and Rudder A.8 Class Rules Amendments A.9 Class Rules Interpretations Section F – Rig A.10 Hull Registration Number

A.11 Certification F.1 Parts A.12 Validity of Certificates F.2 General A.13 Compliance with Class Rules F.3 Mast A.14 Re-Certification F.4 Boo ms

Sect ion B – Boat Eli gibili ty F.5 Standing Rigging B.1 Certificate F.6 Runn ing Ri gging

B.2 Class Association Sticker Section G – Sails

G.1 Parts PART II – REQUIREMENTS AND G.2 General LIMITATIONS G.3 Mainsail

Section C – Conditions for Racing G.4 Headsail

C.1 General C.2 Crew PART III – APPENDICES

Section H – Illustrations H.1 Class Insignia H.2 Transverse Hull Hollows H.3 Leech stiffening zone

Introduction

One Metre hulls, hull appendages, rigs and sails may be manufactured by any amateur or professional manufacturer without any requirement for a manufacturing license.

The rules in Part II and III are closed class rules which means that anything not specifically permitted is prohibited.

Owners and crews should be aware that compliance with rules in Section C is NOT checked as part of the certification process.

Rules regulating the use of equipment during a race are contained in Section C of these class rules, Part I of the ERS and in the Racing Rules of Sailing.

This introduction provides an informal background only and the International One Metre Class Rules proper begin on the next page.

Page:22 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :2 PART I – ADMINISTRATION

Section A – General

A.1 LANGUAGE

A.1.1 The official language of the class is English and in case of dispute over translation the English text shall prevail.

A.1.2 The word “shall” is mandatory and the word “may” is permissive.

A.2 ABBREVIATIONS

A.2.1 ISAF International Sailing Federation IRSA International Radio Sailing Association MNA ISAF Member National Authority DNM IRSA Member ICA International Class Association NCA National Class Association ERS Equipment Rules of Sailing RRS Racing Rules of Sailing

A.3 AUTHORITIES AND RESPONSIBILITIES

A.3.1 The international authority of the class is the IRSA which shall co-operate with the ICA in all matters concerning these class rules.

A.3.2 No legal responsibility with respect to these class rules, or accuracy of measurement, rests with: the ISAF the IRSA the MNA the DNM the ICA any NCA the certification authority an official measurer

No claim arising from these class rules can be entertained.

A.3.3 Notwithstanding anything contained herein, the certification authority has the authority to withdraw a certificate and shall do so on the request of the IRSA.

A.4 ADMINISTRATION OF THE CLASS

A.4.1 The IRSA has delegated its administrative functions of the class to DNMs. A DNM may delegate part or all of its functions, as stated in these class rules, to an NCA.

Page:33 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :3 A.4.2 In countries where there is no DNM, or the DNM does not wish to administer the class, its administrative functions as stated in these class rules shall be carried out by the ICA which may delegate the administration to an NCA.

Page:44 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :4 A.5 ISAF RULES

A.5.1 These class rules shall be read in conjunction with the 2013-2016 ERS.

A.5.2 Except where used in headings, when a term is printed in “bold ” the definition in the ERS applies and when a term is printed in “italics” the definition in the RRS applies.

A.6 CHAMPIONSHIP RULES

A.6.1 The Class Championship Rules shall apply at World and Continental Championships.

A.7 SAILING INSTRUCTIONS A.7.1 These class rules shall not be varied by sailing instructions except as provided by A.7.2. A.7.2 At World or Continental Championships the sailing instructions may vary these class rules only with the agreement of the ICA.

A.8 CLASS RULES AMENDMENTS

A.8.1 Amendments to these class rules shall be proposed by the ICA and are subject to the approval of IRSA.

A.9 CLASS RULES INTERPRETATIONS

A.9.1 GENERAL

Interpretation of class rules, except as provided by A.9.2, shall be made in accordance with the IOM ICA Regulations.

A.9.2 AT AN EVENT

Any interpretation of class rules required at an event may be made by an international jury constituted in accordance with the RRS. Such interpretation shall only be valid during the event and the organising authority shall, as soon as practical after the event, inform the IRSA, the DNM and the ICA.

A.10 HULL REGISTRATION NUMBER

A.10.1 Registration numbers shall be issued by the certification authority. A.10.2 Registration numbers shall be issued in consecutive order starting at “1”. A.10.3 Each hull shall have a unique registration number which shall include the national letters and the certification authority’s sequential registration number. Under no circumstances may a registration number be used on a hull other than the hull on which it was first used.

A.11 CERTIFICATION

A.11.1 For a hull not previously certified, all items required by the measurement form(s) to be measured shall be measured by an official measurer and the details of hull and owner entered onto the certification measurement form.

A.11.2 The certification measurement form, and certification fee if required, shall be sent to the certification authority in the country where the hull is to be registered within 4 weeks after completion of certification measurement.

Page:55 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :5 A.11.3 Upon receipt of a satisfactorily completed certification measurement form and certification fee if required within the 4 week time limit, the certification authority

Page:66 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :6 may issue a certificate .

A.11.4 The certification authority shall retain the original certification measurement form, which shall be transferred to the new certification authority upon request if the hull is exported.

A.12 VALIDITY OF CERTIFICATE

A.12.1 A certificate becomes invalid upon: (a) A change of ownership, (b) Withdrawal by the certification authority, (c) The issue of another certificate .

A.13 COMPLIANCE WITH CLASS RULES

A.13.1 A boat ceases to comply with the class rules upon: (a) Use of equipment that does not comply with limitations in the class rules, (b) Use of equipment that does not comply, or that causes the boat not to comply, with limitations recorded on the certificate , (c) Alteration or repair of equipment required by the measurement form(s) to be measured, except where permitted by the class rules, (d) A change of class rules that causes equipment in use to cease to be permitted, except where the equipment may comply with the class rules in force at the time of its initial certification measurement.

A.14 RE-CERTIFICATION

A.14.1 A hull may be issued with a new certificate, showing dates of initial and new certification measurement as applicable: (a) WHEN A CERTIFICATE BECOMES INVALID UPON CHANGE OF OWNERSHIP and the new owner applies to the certification authority in the country where the hull is to be registered. The application shall include the old certificate and re- certification fee if required. In the case of an imported hull the certification authority shall request the certification measurement form from the previous certification authority and a new hull registration number shall be issued, (b) WHEN A CERTIFICATE HAS BEEN WITHDRAWN, OR WHEN THE CERTIFICATE AND CERTIFICATION MEASUREMENT FORM CANNOT BE LOCATED and certification measurement as required for initial certification has been undertaken.

A.14.2 A boat that has ceased to comply with the class rules may be brought into compliance: (a) WHEN THE LIMITATIONS AFFECTING THE EQUIPMENT ARE IN THE CLASS RULES by carrying out certification measurement of affected equipment, (b) WHEN THE LIMITATIONS AFFECTING THE EQUIPMENT ARE ON THE CERTIFICATE

Page:77 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :7 by carrying out certification measurement of affected equipment as required for initial certification.

Page:88 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :8 Section B – Boat Eligibility

To be eligible to take part in racing , the rules in this section shall be complied with.

B.1 CERTIFICATE

B.1.1 The hull shall have a valid certificate .

B.1.2 A certificate issued prior to the effective date of these class rules remains valid until any of the criteria in A.12.1 is met.

B.2 CLASS ASSOCIATION STICKER

B.2.1 A valid class association sticker, if required by the NCA or the ICA, shall be affixed to the hull in a conspicuous position.

Page:99 International One Metre Class Rules 2015 Interna tiona l One Metre Class Ru les 201 5 Page :9 PART II – REQUIREMENTS AND LIMITATIONS

The crew and the boat shall comply with the rules in Part II when racing . Measurement to check conformity with rules of Section C is not part of certification measurement.

The rules in Part II are closed class rules. Measurement shall be carried out in accordance with the ERS except where varied in this Part.

Section C – Conditions for Racing

C.1 GENERAL

C.1.1 RULES

The following ERS rules shall not apply: (a) B.1.2 Mast Lower Limit Mark (b) B.2 Headsail Booms.

C.2 CREW

C.2.1 LIMITATIONS

The crew shall consist of one person.

C.3 ADVERTISING

C.3.1 LIMITATIONS

The boat shall display only such advertising as permitted by the ISAF Advertising Code.

C.4 BOAT

C.4.1 DIMENSIONS

With the boat floating in fresh water: minimum maximum Draught ...... 370 mm ..... 420 mm The depth of hull from waterline ...... 60 mm Hull length ...... 1000 mm

C.4.2 WEIGHT

minimum maximum The weight of boat in dry condition excluding wind

indicator if used ...... 4000 g

C.4.3 CORRECTOR WEIGHT(S)

Corrector weight(s) to achieve compliance with C.4.2, if used, shall be fixed in/on the hull and not be altered or moved during an event.

C.4.4 WATER Water shall not be used to trim the boat and it may be removed at any time.

Page:1010 International One Metre Class Rules Interna tiona l One Metre Class Ru les 201 5 201 5 Page :10 C.5 HULL

C.5.1 IDENTIFICATION

The hull registration number shall be displayed on the external surface of the hull shell or deck clearly and legibly with a minimum height of 20 mm.

C.5.2 MAINTENANCE

Routine maintenance to the hull such as removing and adding fittings and remote control equipment, replacing hull patches, painting, polishing, smoothing etc., is permitted without re-measurement and re-certification provided the compliance with D.2 is not affected.

C.5.3 REMOTE CONTROL EQUIPMENT USE (a) The rudder control unit shall control the rudder only. (b) The sheet control unit shall control the mainsail sheet and headsail sheet only. (c) Crew may use only the following radio transmissions from the boat: (1) control unit positioning, (2) radio link information, (3) monitoring of onboard battery(s) conditions. (d) During an event remote control and related equipment if temporarily removed and or replaced: (1) shall be refitted in the same position. (2) shall be replaced by equipment of similar weight.

C.6 HULL APPENDAGES

C.6.1 MAINTENANCE

The hull appendages may be altered after certification measurement, without undergoing new certification measurement, provided compliance with E.3 is not affected.

C.6.2 LIMITATIONS

Except when a hull appendage has been lost or damaged beyond repair, only one keel and one rudder shall be used during an event. Replacement may be made only with the approval of the race committee. Unless the hull appendage has been lost, the race committee shall remove or cancel any event limitation mark attached to the hull appendage that has been replaced.

C.6.3 USE (a) The keel shall not move or rotate relative to the hull , except by flexing. (b) The hull appendages shall not project outboard of the hull . (c) If removed: (1) The keel shall be refitted in the same attitude and position in the hull . (2) Parts of the keel shall be refitted in the same attitude and position relative to the keel. (3) The rudder shall be refitted in the same attitude and position relative to the

Page:1111 International One Metre Class Rules Interna tiona l One Metre Class Ru les 201 5 201 5 Page :11 hull .

Page:1212 International One Metre Class Rules Interna tiona l One Metre Class Ru les 201 5 201 5 Page :12

C.6.4 WEIGHTS minimum maximum Keel, excluding fasteners to hull ...... 2200 g ...... 2500 g Rudder , including stock ...... 75 g

C.7 RIG

C.7.1 LIMITATIONS

Except when an item has been lost or damaged beyond repair, one mast, one mainsail boom and one headsail boom, for each of the three rigs , may be used during an event. Replacement may be made only with the approval of the race committee. Unless the spar is lost, the race committee shall remove or cancel any event limitation mark attached to the spar that has been replaced.

C.7.2 USE

The rig shall not project beyond the fore and aft ends of the hull .

C.7.3 ADDED WEIGHTS (a) Weights of any material may be positioned in and/or on a mast spar below the lower point. Weights of density greater than 8000 kg/m 3 may be positioned in and/or on a mast spar above the lower point. (b) Such weights may be removed or added at any time subject to C.4.1 and C.4.2. C.7.4 MAST (a) DIMENSIONS

minimum maximum Lower point to deck limit mark

as defined in D.1.5 ...... 60 mm ..... 100 mm Within these limits, the variation in height of lower point for each rig ...... ± 5 mm Mast spar curvature between lower point and upper point ...... unrestricted

(b) USE The spar stepping position and wind indicator position are optional. C.7.5 BOOMS DIMENSIONS

minimum maximum Boom spar curvature measured between points on

the top of the spar 10 mm from each end ...... 3 mm

C.7.6 STANDING RIGGING USE The headsail boom swivel shall be attached to the hull approximately on the hull centreplane. The alignment of the swivel between the hull and the headsail boom shall be controlled only by the rigging tension.

Page:1313 International One Metre Class Rules Interna tiona l One Metre Class Ru les 201 5 201 5 Page :13 C.7.7 RUNNING RIGGING

USE (a) The mainsail sheet and the headsail sheet may be worked by a sheet control line attached to the sheet control unit. (b) The upper end of any headsail boom topping lift shall be attached to the headsail halyard and/or stay , or their mast spar fitting(s). (c) A headsail boom topping lift restraint line(s) attached to, or passing around, the topping lift may be attached to and/or passed around any or all of the following: topping lift; headsail ; headsail halyard ; headsail stay ; headsail boom. (d) A mainsail tack control line may be passed around or through the mast spar, the mainsail boom spar and/or their fittings.

C.8 SAILS

C.8.1 MAINTENANCE

Routine maintenance such as replacement of battens and patching over damaged areas is permitted without re-measurement and re-certification.

C.8.2 LIMITATIONS

Except when a sail has been lost or damaged beyond repair, no more than one mainsail and one headsail , for each rig, shall be used during an event. Replacement may be made only with the approval of the race committee. Unless the sail is lost, the race committee shall remove or cancel any event limitation mark attached to the sail that has been replaced.

C.8.3 IDENTIFICATION

Identification shall comply with the RRS. Sails certified before 1st January 2005 shall comply with the sail identification rules in force at that time or at the time of certification measurement.

C.8.4 USE

(a) GENERAL (1) A sail of one rig shall not be used with another rig. (2) A sail may not be used alone, except where the other sail of that rig has been lost or damaged during the race.

(b) MAINSAIL (1) The tack point shall not be set more than 25 mm forward of the forward end of the boom spar and the clew point shall not be set more than 25 mm aft of the aft end of the boom spar. (2) Any luff bolt rope or luff slides shall be set in a mast spar track. (3) Luff tabling may envelop a mast spar jackstay. (c) HEADSAIL (1) A line taken through the tack point and the head point shall cut the forward face of the mast spar lower than the lower edge of the headsail stay limit mark at the fore side of the spar when the boom spar is on the centreplane of the hull .

Page:1414 International One Metre Class Rules Interna tiona l One Metre Class Ru les 201 5 201 5 Page :14 (2) The tack point shall not be set more than 25 mm forward of the forward end of the boom spar and the clew point shall not be set more than 25 mm aft of the

Page:1212 International One Metre Class Rules Interna tiona l One Metre Class Ru les 201 5 201 5 Page :12 aft end of the boom spar. (3) Luff tabling may envelop the headsail stay . (4) Any luff slides shall be set on the headsail stay .

Section D – Hull

D.1 GENERAL D.1.1 RULES The hull shall either comply with the class rules in force at the time of its initial certification measurement or comply with the current class rules. D.1.2 CERTIFICATION See rule A.11.

D.1.3 BUILDERS (a) No building licence is required for hulls built in accordance with D.2.1. (b) A building licence may be granted to commercial builders who wish to use mass production methods to lower the cost of hulls, but which do not comply with D.2.1. Such licence shall be based on a building specification approved by the ICA and the IRSA and a contract between the IRSA and the builder.

D.1.4 IDENTIFICATION

The hull registration number shall be marked in an easily visible location on a non- removable part of the hull excluding fittings and corrector weights by any of the following means: painting on, engraving in, bonding in, moulding in.

D.1.5 DECK LIMIT MARK

The deck limit mark shall be displayed on the centreplane of the hull near to the mast position. It shall be a minimum of 5 mm in diameter.

D.2 HULL

D.2.1 MATERIALS (a) Subject to (b) and (c), the hull , excluding fittings and remote control equipment but including any supports and containers for such items, shall be made of and joined using one or more of the following materials: (1) Metal, (2) Wood; wood based products containing only permitted materials, (3) Resin, which may be coloured and/or reinforced with glass fibres, (4) Adhesive, (5) Varnish; paint, (6) Film covering materials which may be fibre reinforced, (7) Elastomeric material, (8) Thermoplastic, which may be moulded, containing only permitted materials.

Page :11 11 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :11 11 (b) With the exception of elastomeric materials, materials shall not be: expanded, foamed, honeycombed.

Page :12 12 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :12 12 (c) Unrestricted by (a) and (b): (1) A builder’s mark may be applied, (2) The hull registration number shall be applied. (3) A hull made with Texalium and with a date of initial fundamental measurement, prior to 1 September 2004 may be certified.

D.2.2 CONSTRUCTION Construction is unrestricted subject to the following: (a) The hull shall be a monohull . (b) Except for trunking for the keel and rudder , the hull shall not have: (1) Voids in the waterplane and/or the underwater profile, (2) Hollows in the plan view and/or the underwater profile that exceed 3 mm, (3) Transverse hollows in the undersurface of the hull that exceed 3 mm when tested parallel to the waterplane as in figure H.2. (c) The forward 10 mm of the hull shall be of elastomeric material. (d) The rudder shall be attached to the hull aft of where the keel is attached.

D.2.3 FITTINGS Fittings are unrestricted except that: (a) Fittings that can contribute to the stiffness and/or strength and/or watertight integrity of the hull shall be of materials permitted by D.2.1. (b) Ball and/or roller bearings may only be used for: sheet control line blocks, mainsail boom sheet blocks and headsail boom sheet blocks. (c) Fittings shall not project outboard of the hull shell or deck.

D.2.4 REMOTE CONTROL EQUIPMENT (a) The following is permitted: (1) One or more receivers. (2) One rudder control unit. (3) One sheet control unit. (4) Battery cells assembled in one or more packs. (5) Electric cables, connectors and switches. (6) One device to indicate the battery voltage. In addition, items listed under (1) to (5) may have their own built-in battery voltage indication. (7) A device to control downstream voltage delivered to permitted radio control equipment as defined by items listed under (1) to (6) of this rule. (b) The rudder control unit and the sheet control unit may contain ball and/or roller bearings. (c) Remote control equipment may be fastened using hook and loop fasteners and/or the materials listed in D.2.1(a).

Page :13 13 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :13 13 Section E – Hull Appendages

E.1 PARTS

E.1.1 MANDATORY (a) Keel, which may comprise a fin and a bulb . (b) Rudder

E.2 GENERAL

E.2.1 RULES

Hull appendages shall comply with the current class rules. E.2.2 BUILDERS No licence is required.

E.3 KEEL AND RUDDER

E.3.1 MATERIALS

Materials shall not be of density higher than lead (11300 kg/m 3).

E.3.2 CONSTRUCTION Construction is unrestricted subject to the following: (a) The keel and rudder shall be removable from the hull . (b) The keel and rudder shall not (1) be connected, (2) be articulated, (3) have openings through which water could flow when in use.

E.4 KEEL

E.4.1 DIMENSIONS

minimum maximum The largest transverse dimension except for the lowest 60 mm ...... 20 mm

Section F – Rig

F.1 PARTS

F.1.1 MANDATORY (a) Mast. (b) Mainsail boom. (c) Headsail boom. (d) Standing rigging.

Page :14 14 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :14 14 (e) Running rigging. (f) Fittings.

Page :15 15 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :15 15 F.2 GENERAL

F.2.1 RULES

Rigs shall comply with the current class rules. F.2.2 MANUFACTURERS No licence is required.

F.2.3 LIMITATIONS The function of items shall be limited to what is normally provided by items of their type.

F.2.4 CONSTRUCTION (a) Fittings and/or control lines may be combined provided their function is not extended beyond what is permitted. (b) The position of parts, and the length and tension of rigging, may be adjustable unless otherwise restricted. (c) Ball and/or roller bearings may be used for: kicking strap fitting; gooseneck; mainsail boom sheet blocks; headsail boom sheet blocks; headsail boom swivel.

F.3 MAST

F.3.1 MATERIALS (a) The spar shall be aluminium alloy of 2024, 5754, 6005, 6060, 6061, 6063, 6082 or 7075 grade, or wood. (b) Other permitted materials in the spar are: adhesive; paint; powder coat; varnish; wax. An aluminium alloy spar may be anodised.

F.3.2 CONSTRUCTION (a) A mast stub arrangement is permitted and, if used, shall be taken to be part of the mast spar. (b) Between the lower point and the upper point the spar section shall be: (1) of circular outer shape, (2) constant within the variations permitted by F.3.4 except for the following permitted items: an internal sail track, local cutaways for the insertion of a bolt rope or slides, openings for fittings and/or rigging, internal and/or external spar joiners. (c) Limit marks may be applied by the following means: (1) paint, (2) self adhesive tape, (3) fittings.

F.3.3 FITTINGS

(a) MANDATORY (1) Mainsail halyard(s) fitting(s) or opening(s). (2) Shroud fitting(s) and/or opening(s).

Page :16 16 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :16 16 (3) Gooseneck. (4) Kicking strap fitting.

Page :17 17 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :17 17 (b) OPTIONAL (1) Wind indicator and/or its fitting. (2) Backstay crane and its fitting. (3) Headsail stay fitting and/or opening. (4) Headsail halyard fitting and/or opening. (5) Pair of spreaders and their fittings(s) and/or opening(s). (6) Mast spar rings and/or loops to attach mainsail luff to the spar. (7) Mainsail jackstay fittings. (8) Mainsail tack fitting(s). (9) Mast strut and its fitting. (10) Checkstay fittings(s). (11) Deck fitting. (12) Heel fitting with or without mast jack. (13) Added weights. (c) CONSTRUCTION (1) A mainsail halyard fitting may include one part that rotates with the sail about an axis located inside or outside the spar section. (2) The mainsail boom spar and the kicking strap pivot points shall be aft of the mast spar in the regions adjacent to these points. (3) Permitted fittings shall be attached to the mast spar or its fittings.

F.3.4 DIMENSIONS

minimum maximum Lower point to upper point

mast 1 ...... 1600 mm mast 2 ...... 1180 mm mast 3 ...... 880 mm Lower edge of headsail stay limit mark at fore side of spar to upper point mast 1 ...... 220 mm mast 2 ...... 160 mm mast 3 ...... 120 mm Height of checkstay rigging point above heel point ...... 100 mm Spar between lower point and upper point ignoring features permitted by F.3.2(b): diameter ...... 10.6 mm difference between largest and smallest diameter ...... 0.3 mm for an aluminium spar, the difference between largest and smallest value along the spar of any wall thickness dimension ...... 0.1 mm Length of spar joiners ...... 100 mm Total length of local cutaways between lower point and upper point ...... 100 mm Limit mark width ...... 3 mm ...... 10 mm

Page :18 18 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :18 18 F.4 BOOMS

F.4.1 MATERIALS (a) Spars shall be aluminium alloy of 2024, 5754, 6005, 6060, 6061, 6063, 6082, 7075, 7068 or 7178 grade, or wood. (b) Other permitted materials in the spar are: adhesive, varnish, paint, wax, powder coat. An aluminium alloy spar may be anodised.

F.4.2 CONSTRUCTION

The spar section shall be constant within the variations permitted by F.4.5 except for (a) the last 10 mm at each end, (b) openings for fittings and rigging. F.4.3 MAINSAIL BOOM FITTINGS (a) MANDATORY (1) Mainsail clew fitting(s). (2) Mainsail boom sheet fitting(s). (3) Kicking strap fitting. (b) OPTIONAL (1) Mainsail tack fitting(s). (2) Gooseneck fitting. (3) Opening(s) for mainsail boom sheet fitting. F.4.4 HEADSAIL BOOM FITTINGS (a) MANDATORY (1) Headsail tack and clew fittings. (2) Headsail boom sheet fitting(s). (3) Swivel and/or its fitting(s). (b) OPTIONAL (1) Headsail stay fitting(s) or opening. (2) Topping lift fitting(s) or opening. (3) Counterweight and its attachment. (4) Opening(s) for headsail boom sheet fitting.

F.4.5 DIMENSIONS

minimum maximum Spar, ignoring features permitted by F.4.2, between points 10 mm from each end: the boom spar shall pass through a 20 mm, ring gauge

difference between the smallest and largest value along the spar of any external dimension...... 0.5 mm

Page :19 19 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :19 19

for an aluminium spar, the difference between the largest and smallest value along the spar of any wall thickness dimension ...... 0.1 mm

Page :20 20 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :20 20 F.5 STANDING RIGGING

F.5.1 MATERIALS Except for terminations and the headsail boom swivel, the standing rigging shall be of steel and/or polymer.

F.5.2 CONSTRUCTION (a) MANDATORY (1) Pair of shrouds. (2) Headsail boom swivel. (b) OPTIONAL (1) Pair of checkstays if a mast strut is not fitted. (2) A headsail stay less than 1 mm in diameter. (3) A mast spar jackstay less than 1 mm in diameter. F.5.3 FITTINGS OPTIONAL (a) Terminations. (b) Length and tension adjustments.

F.6 RUNNING RIGGING

F.6.1 MATERIALS Materials of running rigging are unrestricted. F.6.2 CONSTRUCTION (a) MANDATORY (1) Mainsail boom sheet . (2) Mainsail boom kicking strap. (3) Headsail halyard, if headsail stay is not fitted. (4) Headsail boom sheet . (5) Backstay . (b) OPTIONAL (1) Mainsail halyard(s). (2) Mainsail clew trim line. (3) Mainsail tack trim line (4) Headsail halyard(s). (5) Headsail clew trim line. (6) Headsail tack trim line. (7) Headsail boom topping lift. (8) Headsail boom topping lift restraint line(s).

Page :21 21 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :21 21 F.6.3 FITTINGS OPTIONAL (a) Terminations. (b) Length and tension adjustments. (c) Mainsail boom sheet blocks, headsail boom sheet blocks. (d) A wind indicator attached to the backstay .

Section G – Sails

G.1 PARTS

G.1.1 MANDATORY (a) Mainsail . (b) Headsail .

G.2 GENERAL

G.2.1 RULES

Sails shall comply with the class rules in force at the time of their initial certification measurement.

G.2.2 CERTIFICATION (a) The official measurer shall certify sails in the tack and shall date each with the date of certification measurement. (b) An MNA may appoint one or more persons at a sailmaker to measure and certify sails produced by that manufacturer. A special licence shall be awarded for that purpose.

G.2.3 SAILMAKERS

No licence is required. G.2.4 DEFINITIONS Batten Point

The batten point is defined as the intersection of the leech and

(a) the extended centreline of the batten or

(b) a line of minimum length 20 mm marked on the leech if there is no batten.

G.2.5 MEASUREMENT (a) During measurement: (1) battens need not be removed, (2) mainsails with the luff not set in a mast spar track may be attached to spars, (3) a headsail stay and mainsail mast spar jackstay need not be removed. (4) tell tales shall be ignored. (b) Where a mainsail has a luff bolt rope the luff shall be taken as the aft edge of the bolt rope.

Page :22 22 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :22 22 (c) Luff slides shall be ignored when measuring sail dimensions provided that their total length, measured along the luff , does not exceed 10% of the luff length.

Page :23 23 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :23 23 G.3 MAINSAIL

G.3.1 CONSTRUCTION (a) MANDATORY (1) The construction shall be: soft sail , single ply sail. (2) The body of the sail shall consist of the same ply throughout and of not more than four parts joined by seams. (3) Seams shall not deviate more than 10 mm from a straight line between luff and leec h. (4) The sail shall have three battens at the leech or lines marked on the leech as defined in G.2.4(b) if there are no battens. (5) Except within the leech stiffening zones, see H.3, the leech shall not extend aft of straight lines between : (i) the aft head point and the nearest batten point, (ii) adjacent batten points, (iii) the clew point and the nearest batten point. where the batten points are to be taken as defined in G.2.4. (6) The foot shall not extend below a straight line between tack point and clew point. (7) Class insignia. (b) OPTIONAL (1) Tabling, which at the luff may form a pocket for a mast spar jackstay. (2) One or two cringles and/or openings at the head. (3) One cringle and/or openings at each of the clew and tack. (4) Luff openings for mast spar rings and/or loops for mast spar jackstay fittings. (5) Luff bolt rope. (6) Luff track slides. (7) Luff fittings for mast spar rings and/or loops. (8) Luff fittings for mast spar jackstay. (9) Primary reinforcement specified at G.3.3. (10) Secondary reinforcement specified at G.3.3. (11) Primary reinforcement and/or stiffening within the leech stiffening zones defined by templates shown in H.3. (12) Tell tales. (13) Not more than three sail shape indicator stripes, applied using paint or ink. (14) Sailmaker labels.

G.3.2 CONSTRUCTION TECHNIQUES (a) Only the following construction techniques shall be used where parts are joined or added as permitted in G.3.1 and G.3.3: welding; gluing; bonding with self adhesive tapes/materials; stitching. (b) Except for stitching, the joining techniques used at seams shall not extend beyond the edges of the seam.

Page :24 24 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :24 24

G.3.3 DIMENSIONS

minimum maximum Leech length: mainsail 1 ...... 1610 mm ... 1620 mm mainsail 2 ...... 1200 mm ... 1210 mm mainsail 3 ...... 910 mm ..... 920 mm Foot length: mainsail 1 ...... 350 mm ..... 360 mm mainsail 2 ...... 340 mm ..... 350 mm mainsail 3 ...... 310 mm ..... 320 mm Quarter width: mainsail 1 ...... 305 mm ..... 315 mm mainsail 2 ...... 295 mm ..... 305 mm mainsail 3 ...... 265 mm ..... 275 mm Half width: mainsail 1 ...... 235 mm ..... 245 mm mainsail 2 ...... 225 mm ..... 235 mm mainsail 3 ...... 205 mm ..... 215 mm Three-quarter width: mainsail 1 ...... 135 mm ..... 145 mm mainsail 2 ...... 130 mm ..... 140 mm mainsail 3 ...... 115 mm ..... 125 mm Top width ...... 20 mm Primary reinforcement: from nearest sail corner measurement point ...... 125 mm Secondary reinforcement: from nearest sail corner measurement point ...... 125 mm for flutter patches ...... 50 mm at luff fittings, luff slides and/or luff openings ...... 20 mm Tabling width ...... 15 mm Seam width ...... 15 mm Seam to nearest sail corner measurement point ...... 150 mm Batten length: middle and lower ...... 100 mm upper ...... 75 mm Batten width ...... 10 mm Batten point, as defined in G.2.4, to nearest leech point …………….... 20 mm Largest cringle dimension ...... 10 mm With the exception for luff slides, largest luff fitting dimension ...... 10 mm Sail shape indicator stripe width ...... 30 mm

Page :20 20 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :20 20 G.4 HEADSAIL

G.4.1 CONSTRUCTION (a) MANDATORY (1) The construction shall be: soft sail , single ply sail. (2) The body of the sail shall consist of the same ply throughout and of not more than three parts joined by seams. (3) Seams shall not deviate more than 10 mm from a straight line between luff and leec h. (4) Except within the leech stiffening zones, see H.3, the leech shall not extend aft of a straight line between the aft head point and the clew point. (5) The foot shall not extend below a straight line between tack point and clew point. (b) OPTIONAL (1) Tabling, which at the luff may form a pocket for a headsail stay . (2) One or two cringles and/or openings at the head. (3) One cringle and/or openings at each of the clew and tack. (4) Headsail stay slides and/or loops. (5) Primary reinforcement specified at G.4.3. (6) Secondary reinforcement specified at G.4.3. (7) Not more than two battens at the leech. (8) Primary reinforcement and/or stiffening within the leech stiffening zones defined by templates as shown in H.3. (9) Tell tales. (10) Not more than two sail shape indicator stripes, applied using paint or ink. (11) Sailmaker labels.

G.4.2 CONSTRUCTION TECHNIQUES (a) Only the following construction techniques shall be used where parts are joined or added as permitted in G.4.1 and G.4.3: welding; gluing; bonding with self adhesive tapes/materials; stitching. (b) Except for stitching, the joining techniques used at seams shall not extent beyond the edges of the seam.

Page :21 21 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :21 21

G.4.3 DIMENSIONS

minimum maximum Luff length : headsail 1 ...... 1320 mm ... 1330 mm headsail 2 ...... 980 mm ..... 990 mm headsail 3 ...... 730 mm ..... 740 mm Leech length: headsail 1 ...... 1245 mm ... 1255 mm headsail 2 ...... 900 mm ..... 910 mm headsail 3 ...... 655 mm ..... 665 mm Foot length: headsail 1 ...... 375 mm ..... 385 mm headsail 2 ...... 340 mm ..... 350 mm headsail 3 ...... 290 mm ..... 300 mm Half width: headsail 1 ...... 185 mm ..... 195 mm headsail 2 ...... 165 mm ..... 175 mm headsail 3 ...... 140 mm ..... 150 mm Top width ...... 20 mm Primary reinforcement: from nearest sail corner measurement point ...... 125 mm Secondary reinforcement from nearest sail corner measurement point ...... 125 mm for flutter patches ...... 50 mm at headsail stay slides and/or loops ...... 20 mm Tabling width ...... 15 mm Seam width ...... 15 mm Seam to nearest sail corner measurement point ...... 100 mm Batten length ...... 75 mm Batten width ...... 10 mm Clew point to lower batten point as defined in G.2.4: headsail 1 ...... 400 mm ..... 430 mm headsail 2 ...... 285 mm ..... 315 mm headsail 3 ...... 205 mm ..... 235 mm Clew point to upper batten point as defined in G.2.4: headsail 1 ...... 820 mm ..... 850 mm headsail 2 ...... 590 mm ..... 620 mm headsail 3 ...... 425 mm ..... 455 mm Largest cringle dimension ...... 10 mm Sail shape indicator stripe width ...... 30 mm

Page :22 22 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :22 22

PART III – APPENDICES

Section H – Illustrations

H.1 CLASS INSIGNIA

H.2 TRANSVERSE HULL HOLLOWS

Rule D.2.2(b)(3) The hull shall not have transverse hollows in the undersurface of the hull that exceed 3 mm when tested parallel to the waterplane.

Page :23 23 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :23 23 H.3 LEECH STIFFENING ZONE

H.3.1 DEFINITION

A leech stiffening zone is a part of a sail that may be covered by a leech stiffening zone template as described in H.3.2 and positioned as described in H.3.3.

H.3.2 TEMPLATE AND TEMPLATE DATUM POINT

Leech stiffening zone template Length, L Mainsail middle and lower……………………………… 120 Mainsail upper and headsail template…………………… 95

H.3.3 TEMPLATE POSITIONING

It shall be possible to position the template so that (1) its datum point is over the relevant batten point, (2) its long edges cut the leech and (3) it covers any primary reinforcement and/or stiffening.

Effective: 1 March 2015 Previous issues: March 1988, March 1989, May 1992, amended June 1994, June 1995, 1 March 2002, 15 May 2003, 1 April 2007, 5 November 2009, 13 February 2011, 30 March 2012, 1 March 2013.

Page :24 24 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :24 24

© 2015, International One Metre International Class Association (IOM ICA)

Page :25 25 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :25 25

INTERNATIONAL

MARBLEHEAD CLASS RULES

Draft Only November 2015

Version 10.1

Page :26 26 Interna tiona l One Metre Clas s Ru les Interna tiona l One Metre Class Ru les 201 5 201 5 Page :26 26 The Marblehead class was developed by Roy L. Clough of the Marblehead Model Yacht Club in Marblehead, Massachusetts, USA, and was given international status by the predecessor of the IRSA in 1937.

Page :33 Interna tiona l One Metre Clas s Ru les 201 5 Interna tiona l One Metre Class Ru les 201 5 Page :33 INDEX

Introduction 3 Section D – Hull

D.1 General 10 PART I – ADMINISTRATION D.2 Hull 11

Section A – General Section E – Hull Appendages A.1 Language 4 E.1 General 11 A.2 Abbreviations 4 E.2 Hull Appendages 11 A.3 Authorities and Responsibilities 4 Section F – Rig A.4 Administration of the Class 5 F.1 Parts 12 A.5 ISAF Rules 5 F.2 General 12 A.6 Championship Rules 5 F.3 MAST 12 A.7 Sailing Instructions 5 F.4 Booms 13 A.8 Class Rules Amendments 5 F.5 Headsail Luff Spars 13 A.9 Class Rules Interpretations 5 Section G – Sails A.10 Hull Registration Number 5 G.1 Parts 13 A.11 Certification 6 G.2 General 13 A.12 Validity of Certificate 6 G.3 Mainsails 15 A.13 Compliance with Class Rules 6 G.4 Headsails 15 A.14 Re-Certification 7 G.5 Sail Area 15 Section B – Boat Eligibility PART III – APPENDICES B.1 Certificate 7 Section H – Measurement B.2 Class Association Sticker 7 Section I - Figures PART II – REQUIREMENTS AND I.1 Depth Restriction Gauge 15

LIMITATIONS I.2 Length and Datum Waterplane 16 Section C – Conditions for Racing I.3 Length Restriction Gauge C.1 General 8 I.4 Transverse Hull Hollows 17 C.2 Crew 8 I.5 Combined Boom Spar Cross Section C.3 Advertising 8 17

C.4 Hull 8 I.6 Control of the Upper and Lower C.5 Hull Appendages 8 Leech Profile 18 C.6 Rig 9 I.7 Sail Area Measurement 19 C.7 Sails 9 I.8 Top Width and Stiffening at Head 20 C.8 Remote Control Equipment 10 I.9 Use of Foot Roach Gauge 20

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 2

Introduction

This introduction only provides an informal background and the International A Class Rules proper begin on the next page.

Certification and alterations Marblehead Class hulls, hull appendages, rigs and sails are certified by certification measurement.

Marblehead Class hulls, hull appendages, rigs and sails may, after initial certification measurement, only be altered to the extent permitted in Section C of the class rules.

Responsibility Owners and crews should be aware that compliance with rules in Section C is NOT checked as part of the initial certification measurement process.

It is the responsibility of the owner and any other person in charge to ensure that a boat is maintained to comply with her class rules and that her certificate remains valid (RRS 78.1).

Deviations outside of tolerances When an equipment inspector or official measurer for an event decides that a boat does not comply the class rules RRS 78.3 obliges him to make a report in writing to the Race Committee. When a Race Committee receives such a report they are obliged to protest the boat (RRS 60.2).

When the protest committee finds that deviations in excess of tolerances specified in the class rules are not caused by normal wear and tear and/or do improve the performance of the boat, it shall penalise her.

If the protest committee decides that a class rule has deliberately or knowingly been breached by an owner, competitor, or crew they may call a hearing under rule 69.

Class rules Rules regulating the use of equipment during a race are contained in Section C of these class rules, in ERS Part I and in the Racing Rules of Sailing.

The class rules for the International Marblehead Class are open class rules in which anything not specifically prohibited by the class rules is permitted, where individual rules require, permit, or prohibit as necessary.

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 3 PART II – REQUIREMENTS AND LIMITATIONS

The crew and the boat shall comply with the rules in Part II when racing .

Certification to check conformity with rules of Section C is not part of certification measurement.

The rules in Part II comprise open class rules where anything not specifically prohibited is permitted and closed class rules where anything not specifically permitted is prohibited.

Certification shall be carried out in accordance with the current ERS except where varied in this Part.

Section C – Conditions for Racing

C.1 GENERAL

C.1.1 RULES

The following ERS rules shall not apply:

B.1.2 Mast Lower Limit Mark.

B.2 Headsail Booms.

C.2 CREW

C.2.1 LIMITATIONS

(a) The crew shall consist of one person.

(b) The crew shall not be substituted during an event.

C.3 ADVERTISING

C.3.1 LIMITATIONS

The boat may display only such advertising as permitted by the ISAF Advertising Code.

C.4 HULL

C.4.1 LIMITATIONS

The geometry of the hull shall not be changed during an event.

C.4.2 IDENTIFICATION

The hull registration number shall be displayed on the external surface of the hull clearly and legibly with a minimum height of 20 mm.

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 4 C.5 HULL APPENDAGES

C.5.1 LIMITATIONS

The same hull appendages shall be used during an event except when a hull appendage has been lost or damaged beyond repair. Such replacement may be made only with the approval of the race committee who shall then remove or cancel any event limitation mark attached to the replaced hull appendage.

C.5.2 DEPTH RESTRICTION

The depth restriction gauge, when oriented transversely as in Figure I.1, shall be capable of being passed under the hull appendages without either of the two upper corners of the gauge losing contact with the hull.

C.5.3 USE

The hull appendages:

(a) containing or forming ballast shall not be moved or rotated relative to the hull.

(b) shall not be attached to the hull more than 15 mm from the hull centreplane.

(c) shall not project fore or aft of the hull in relation to the datum waterplane described in Figure I.2.

(d) shall not be moved, articulated or retractable.

C.6 RIG

C.6.1 LIMITATIONS

Not more than six rigs and their sails shall be used during an event. A mast or boom lost or damaged beyond repair may be replaced only with the approval of the race committee who shall then remove or cancel any event limitation mark attached to the replaced item.

C.6.2 USE

The rig shall not project fore or aft of the hull in relation to the datum waterplane described in Figure I.2.

C.6.3 DIMENSIONS

minimum maximum

Deck limit mark to the mast lower point G - 10 mm G + 10 mm

Deck limit mark to the lower edge of the I foretriangle height limit mark when G is

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 5 at the certified value

Deck limit mark to the mast upper point 2160 mm

Mast lower point to the mast upper A point

C.7 SAILS

C.7.1 LIMITATIONS

(a) Not more than six mainsails and six headsails, with a maximum of three mainsails and three headsails from any A, B or C rig/sail group, shall be used.

(b) The race committee may attach event limitation marks to sails at an event.

(c) The minimum mainsail luff length used when racing shall be 990 mm.

(d) Not more than one mainsail and one headsail shall be set at a time.

(e) A mainsail shall be carried set when racing.

(f) Sails shall not be reefed.

(g) When a sail has been lost or damaged beyond repair it may be replaced only with the approval of the race committee who shall then remove or cancel any event limitation mark attached to a replaced sail.

(h) A sail from any A, B or C rig/sail group shall not be used with a sail from another rig/sail group unless it is marked with the appropriate A, B or C rig/sail group letter and it complies with C.7.2.

C.7.2 DIMENSIONS

The dimensions of the sails in each rig/sail group shall not exceed those on the certificate for that rig/sail group.

C.7.3 IDENTIFICATION

(a) Sail identification marks shall comply with the RRS.

(b) The class insignia shall be the letter “M” of dimensions: height and width 25–30 mm, thickness 6–8 mm and shall be displayed on the mainsail above a straight line between the three-quarter leech point and the nearest point on the luff.

C.7.4 USE

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 6 (a) When a mast upper limit mark is required, the mainsail shall be below the mast upper limit mark.

(b) The tack point, projected at 90° to the mast spar, shall not be set below the upper edge of the mast lower limit mark.

(c) When a foretriangle height limit mark is required, a line taken through the tack point and head point of the headsail shall cut the forward face of the mast spar lower than the lower edge of the foretriangle height limit mark when the headsail clew point is on the hull centreplane.

(d) When a sail has a luff bolt rope or spar sliders they shall be set in a track in the spar.

C.8 EQUIPMENT

C.8.1 PROHIBITED

(a) Automated control of rig and/or sails.

(b) Automated steering and/or navigation.

(c) On board camera(s).

(d) The use of pictures from any source while racing.

C.8.2 USE

(a) Except for the establishment and maintenance of a radio control link, control unit positioning information, and signal strength and battery status information, no radio transmissions from the boat shall be used while racing.

(b) Remote control and related equipment, if temporarily removed and/or replaced: (1) shall be refitted in the same position. (2) shall be replaced by equipment of similar weight.

Section D – Hull

D.1 GENERAL

D.1.1 RULES

The hull shall either comply with the class rules in force at the time of its initial certification measurement or comply with the current class rules.

D.1.2 CERTIFICATION

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 7 See rule A.11.

D.1.3 IDENTIFICATION

The hull registration number shall be marked in an easily visible location on a non-removable part of the hull by any of the following means: painting on, engraving in, bonding in, moulding in.

D.2 HULL

D.2.1 DECK LIMIT MARKS

A deck limit mark for each rig/sail group, A, B and C recorded on the certificate, shall be displayed on the hull centreline near to the relevant mast position. Each limit mark shall be a minimum of 5 mm in diameter.

D.2.2 MATERIALS

(a) Except in remote control equipment, the density of material shall not exceed that of lead (11,340 kg/m3).

(b) The forward 13 mm shall be of elastomeric material.

D.2.3 CONSTRUCTION

(a) The hull shall be a monohull.

(b) Except for the trunking for hull appendages, the hull shall not have:

(1) voids in the waterplane and/or the underwater profile,

(2) hollows in the plan view and/or the underwater profile that exceed 3 mm,

(3) transverse hollows in the undersurface of the hull that exceed 3 mm when tested parallel to the waterplane as in Figure I.4.

D.2.4 DIMENSIONS

minimum maximum Hull length in relation to the datum waterplane 1275 mm 1290 mm described in Figure I.2.

Hull beam 100 mm

D.2.5 FITTINGS

Fittings shall not project fore or aft or transversely outboard of the hull in relation to the datum waterplane described in Figure I.2.

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 8 Section E – Hull Appendages

E.1 GENERAL

E.1.1 RULES

Hull appendages shall comply with the current class rules.

E.1.2 CERTIFICATION

Certification shall be carried out in accordance with the ERS except where varied in these class rules.

E.2 HULL APPENDAGES

E.2.1 MATERIALS

Materials shall not be of density higher than lead (11,340 kg/m3).

Section F – Rig

F.1 PARTS

A rig shall consist of no more than:

(a) one mast,

(b) one headsail luff spar,

(c) four booms,

(d) standing rigging,

(e) running rigging.

F.2 GENERAL

F.2.1 RULES

Rigs shall comply with the current class rules.

F.2.2 CONSTRUCTION

(a) A fitting shall be no bigger than is reasonably required for its purpose if it rotates or is attached to a rotating spar.

(b) A fitting faired into a spar shall be considered to be part of the spar.

F.3 SPARS

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 9 F.3.1 MEASUREMENT

(a) The mast spar, boom spar and headsail luff spar cross section:

(1) shall be taken to include: fairings, extensions, articulated flaps,

(2) shall be taken with movable parts set to give the greatest dimension,

(3) shall be taken at the junction of two boom spars as in Figure I.5 and

(4) except as in 3, at a point shall be the largest cross sectional dimension perpendicular to the major axis of the spar at that point.

(b) A boom spar which extends fore and aft of the mast spar shall be taken as two boom spars.

F.3.2 CONSTRUCTION

(a) Limit marks shall contrast strongly with the colour of the surface they are placed on.

(b) Except as in F.3.2 (c) and F.3.2 (d) limit marks shall be placed on each mast spar, as in Figure I.7 and as follows:

(1) an upper limit mark, (2) a foretriangle height limit mark, (3) a lower limit mark.

(c) The mast upper limit mark may be omitted where the rig construction makes it impossible to exceed the “A” measurement recorded on the certificate.

(d) The fore triangle height limit mark may be omitted where the rig construction makes it impossible to exceed the “I” measurement recorded on the certificate.

(e) A boom spar with a cross section exceeding 20 mm as permitted by F.3.4 shall not be joined to another boom spar at that point.

F.3.3 MAST SPAR DIMENSIONS

minimum maximum

Deck limit mark to upper point, H 2160 mm

Mast spar cross section above lower point 20 mm

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 10 Mast spar cross section below lower point 40 mm

Mast limit mark width 3 mm 10 mm

F.3.4 BOOM SPAR DIMENSIONS

maximum Length of junction where boom spars meet, as in Figure 100 mm I.4

Minimum combined boom spar cross section over the 40 mm length of a junction, as in Figure I.4

Boom spar cross section within 100 mm of one end only 40 mm of spar

Boom spar cross section at other points 20 mm

F.3.5 HEADSAIL LUFF SPAR DIMENSIONS

maximum

Headsail luff spar cross section 20 mm

Section G – Sails

G.1 PARTS

The sail plan is restricted to no more than:

(a) one trilateral mainsail,

(b) one trilateral headsail.

G.2 GENERAL

G.2.1 RULES

Sails shall comply with the class rules in force at the time of their initial certification measurement or with the current class rules.

G.2.2 CERTIFICATION

The official measurer shall:

(a) certify sails at the tack ,

(b) mark sails with the date of certification measurement,

(c) mark mainsails with the measured area of the largest mainsail in the rig/sail group to which the sail belongs,

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 11 (d) mark headsails with the measured area of the largest headsail in the rig/sail group to which the sail belongs.

G.2.3 DEFINITIONS

Batten Pocket Point

The batten pocket point is defined as the intersection of the extended centreline of the batten pocket, or batten if there is no batten pocket, and the leech.

G.2.4 MEASUREMENT

(a) During measurement:

(1) battens need not be removed,

(2) sails may be attached to spars,

(3) stays not exceeding 2 mm in diameter inside luff tabling need not be removed,

(4) tell tales overlapping the sail edges shall be ignored.

(b) The luff perpendicular , quarter width, half width and three- quarter width shall be taken:

(1) on a double luff sail with supporting spar in place: to the luff, or to the fore edge of the spar, whichever gives the greater dimension,

(2) on a sail attached to spar section fairings, extensions and/or articulated flaps: to their foremost edges when fully extended,

(3) on a sail with the luff set in a track in the spar: to the aft edge of the spar,

(4) on other sails: to the luff,

(5) discontinuous attachments on the luff shall be disregarded provided their total length measured along the luff does not exceed 10% of the luff length and the longest attachment is no more than twice the shortest.

(6) with hollows in the leech and/or luff bridged using the method described in the ERS.

(c) The upper and lower leech profile is controlled as shown in Figure I.6.

(d) Parts of stiffening which are less than 2 mm in diameter and not covered by sail material shall not be taken as parts of the

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 12 sail.

G.2.5 CONSTRUCTION

(a) The construction shall be: soft sail.

(b) Except for the following, stiffening is prohibited:

(1) for battens

(2) at the head.

(c) Sails shall be marked at the clew with their rig/sail group letter, or letters if the sail is to be used with more than one rig/sail group.

(d) A mainsail shall have no more than four battens which shall be near the leech.

(e) A headsail shall have no more than three battens which shall be near the leech.

(f) The foot roach profile may be controlled by either of the following methods:

(1) Foot irregularity.

(2) Use of the foot roach gauge, as in Figure I.9.

G.2.6 DIMENSIONS

maximum

Top width as in Figure I.7:

of a double luff sail 40 mm

of a sail with luff rope 25 mm

of other sails 20 mm Extension of stiffening at the head from a point 20 mm 20 mm forward of the aft head point on a line through the aft head point and head point

Foot irregularity, as in G.2.5 (f) (1) 3 mm Foot roach depth taken from foot to a straight line between 25 mm tack point and clew point, as in G.2.5 (f) (2)

Batten length 105 mm

Batten width 20 mm

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 13 Variation in the following measurements:

between batten pocket point and adjacent batten

pocket point(s),

between clew point and adjacent batten pocket

point, between head point and adjacent batten pocket 25 mm

point

G.3 SAIL AREA

G.3.1 LIMITATION

(a) The measured sail area of each rig/sail group shall not exceed 0.516100 m2.

(b) Rig/sail groups A, B and C shall be recorded on the measurement forms in descending order of mainsail luff length, ‘A’.

G.3.2 CALCULATION

The measured sail area of a rig/sail group is taken as the sum of the following areas for that rig/sail group:

mainsail area, mm2 A × B / 2

excess mainsail area, mm2 A × (2X + Y + 2Z) / 6

headsail area, mm2 Q × R / 2

excess headsail area, mm 2 Q × (2x + y + 2z) / 6

where for that rig/sail group:

A, B, Q and R are the largest dimensions and

X, x are the largest excesses in the quarter widths and

Y, y are the largest excesses in the half widths and

Z, z are the largest excesses in the three-quarter widths

of all the sails in that rig/sail group as in Fig I.7.

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 14

International Marblehead Class Rules 2015 draft version 15

PART III – APPENDICES

The rules in Part III comprise open class rules where anything not specifically prohibited is permitted and closed class rules where anything not specifically permitted is prohibited.

Measurement shall be carried out in accordance with the current ERS except where varied in this Part.

Except where specified otherwise all dimensions are quoted in millimetres.

Section H – Measurement

I.1 MEASUREMENTS AND CALCULATIONS

I.1.1 Linear measurements shall be taken in millimetres and rounded up to the nearest whole number before recording on the certificate, use in subsequent calculations or comparison with a limiting value.

I.1.2 Maximum and minimum values of limitations in the class rules or certificate shall be taken as absolute limiting values.

I.1.3 Calculated values in millimetres or square millimetres shall be rounded up or down to the nearest whole number before recording, use in any subsequent calculations or comparison with any limitation in the class rules or certificate.

I.1.4 Calculated values in square metres shall be rounded up or down to the nearest fourth place of decimals before recording on the certificate.

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 16 Section I - Figures

I.1 DEPTH RESTRICTION GAUGE

100

Upper corners

See rule C.5.2

Radius 660

I.2 LENGTH & DATUM WATERPLANE

See rule C.6.2 See rule C.6.2

See rule D.2.5

Datum waterplane

30 1210

See rule C.5.3 (c) 1275 min 1290 max

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 17 I.3 LENGTH RESTRICTION GAUGE

Gauge used to establish length and datum waterplane.

1290

30 1210

I.4 TRANSVERSE HULL HOLLOWS

3 max

Hull centreplane

3 max See rule D.2.3 (b) (3)

3 max

I.5 COMBINED BOOM SPAR CROSS SECTION See rule F.3.4 Length of junction maximum 100 mm

A

Junction

Section A – A‘ A‘

40 mm maximum

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 18 I.6 CONTROL OF THE UPPER AND LOWER LEECH PROFILE

See rule G.2.4 (c)

THE TEMPLATE

A template of 900 mm radius shall be used for this measuremen t. Aft head point AT THE HEAD

The template shall be placed to touch the aft head point and a straight line through the two

nearest leech points.

AT THE CLEW

The template shall be placed to touch the clew point and a straight line through the two Three-quarter nearest leech points. leech point GENERAL

If a leech point (figure a) and/or a batten pocket point (figure b) falls outside the template when positioned as above, the template shall be re- positioned to either point so that neither point appears outside the template.

LEECH PROFILE Half leech point No part of the leech profile shall fall aft of the aft edge of the template.

(a) (b)

Quarter leech point

Leech point Batten pocket point

Clew point

Interna tio nal Mar blehea d Class R ules 201 5 draft ver sion 19 I.7 SAIL AREA MEASUREMENT

International Marblehead Class Rules 2015 draft version 20

I.8 TOP WIDTH AND STIFFENING AT HEAD

Top width Top width Top width 40 max 25 max 20 max

20 20 20

20 max 20 max 20 max

Double luff sail Sail with luff rope or sliders Other sails

I.9 USE OF FOOT ROACH GAUGE

The foot shall not extend below the foot roach template

Maximum 25mm

Minimum 50mm Minimum 50mm

Effective: 1 March 2016

Previous issues: 2002 with amendments 1 August 2013.

International Marblehead Class Rules 2015 draft version 21

INTERNATIONAL

TEN RATER

CLASS RULES

Draft Only November 2015

Version 9.2 (2)

The Ten Rater rule is a direct descendant of the Length and Sail Area rule of 1887. It has been used for models since the 1890s.

INDEX

Introduction ......

PART I – ADMINISTRATION

Section A – General A.1 Language ...... Section D – Hull A.2 Abbreviations ...... D.1 General ...... A.3 Authorities and D.2 Hull ...... Responsibilities ...... Section E – Hull Appendages A.4 Administration of the Class ...... E.1 General ...... A.5 ISAF Rules ...... E.2 Hull Appendages ...... A.6 Championship Rules ...... A.7 Sailing Instructions ...... Section F – Rig A.8 Class Rules Amendments ...... F.1 General ...... A.9 Class Rules Interpretations ...... F.2 Measured Rig Area ...... A.10 Hull Registration Number ...... Section G – Sails A.11 Certification ...... G.1 General ...... A.12 Validity of Certificates ...... G.2 Measured Sail Area ...... A.13 Compliance with Class Rules ...... A.14 Re-Certification ...... PART III – APPENDICES

Section B – Boat Eligibility Section H – Rating B.1 Certificate ...... H.1 Rating Formula ...... B.2 Class Association Sticker ...... H.2 Rating ......

Section I – Rig Area

I.1 General ...... I.2 Measured Rig Area ...... PART II – REQUIREMENTS AND I.3 Constantly and Evenly LIMITATIONS Tapered Profiles ......

I.4 Other Profiles ...... Section C – Conditions for Racing C.1 General ...... Section J – Sail Area C.2 Crew ...... J.1 General ...... C.3 Advertising ...... J.2 Measured Sail Area ...... C.4 Boat ...... J.3 Soft Sails ...... C.5 Hull ...... J.4 Other Sails ...... C.6 Hull Appendages ...... Section K – Figures C.7 Rig ...... K.1 Spar Measurement ...... C.8 Sails ...... K.2 Soft Sails Measurement ...... C.9 Remote Control Equipment ...... K.3 Other Sails Measurement ...... C.10 Other Equipment ………………..

Dra ft 201 5 V9.2 International Ten Rater Class Rules 2015 2 Introduction

This introduction only provides an informal background and the International Ten Rater Class Rules proper begin on the next page.

Certification and alterations Ten Rater Class hulls, hull appendages, rigs and sails are certified by certification measurement.

Ten Rater Class hulls, hull appendages, rigs and sails may, after initial certification measurement, only be altered to the extent permitted in Section C of the class rules.

Responsibility Owners and crews should be aware that compliance with rules in Section C is NOT checked as part of the initial certification measurement process.

It is the responsibility of the owner and any other person in charge to ensure that a boat is maintained to comply with her class rules and that her certificate remains valid (RRS 78.1).

Deviations outside of tolerances When an equipment inspector or official measurer for an event decides that a boat does not comply the class rules RRS 78.3 obliges him to make a report in writing to the Race Committee. When a Race Committee receives such a report they are obliged to protest the boat (RRS 60.2).

When the protest committee finds that deviations in excess of tolerances specified in the class rules are not caused by normal wear and tear and/or do improve the performance of the boat, it shall penalise her.

When deviations between a boat’s measurements and her certificate cannot be corrected as required by RRS 64.3 (a), the protest committee may consider accepting that the boat shall be brought into rating in another configuration before racing again.

If the protest committee decides that a class rule has deliberately or knowingly been breached by an owner, competitor, or crew they may call a hearing under rule 69.

Class rules Rules regulating the use of equipment during a race are contained in Section C of these class rules, in ERS Part I and in the Racing Rules of Sailing.

The class rules for the International Ten Rater Class are open class rules in which anything not specifically prohibited by the class rules is permitted, where individual rules require, permit, or prohibit as necessary.

International Ten Rater Class Rules 2002 3

PART I – ADMINISTRATION

Generic Part 1 rules are being prepared.

Dra ft 201 5 V9.2 International Ten Rater Class Rules 20154 Part II – Requirements and Limitations

The crew and the boat shall comply with the rules in Part II when racing. Certification to check conformity with rules of Section C is not part of certification measurement.

The rules in Part II are open class rules. Certification shall be carried out in accordance with the ERS except where varied in this Part.

Section C – Conditions for Racing

C.1 GENERAL

C.1.1 RULES

The rules of Section B of the ERS shall not apply.

C.2 CREW

C.2.1 LIMITATIONS

(a) The crew shall consist of one person.

(b) The crew shall not be substituted during an event.

C.3 ADVERTISING

C.3.1 LIMITATIONS

The boat shall display only such advertising as permitted by the ISAF Advertising Code.

C.4 BOAT

C.4.1 FLOTATION

With the boat floating in fresh water, with slack rigging, in sailing condition and dry: (a) the forward waterline ending shall not fall forward of the aft edge of the forward waterline limit mark, (b) the aft waterline ending shall not fall aft of the forward edge of the aft waterline limit mark, (c) submerged parts of the hull shall not extend beyond the inboard edges of the waterline limit marks.

Dra ft 201 5 V9.2 International Ten Rater Class Rules 20155 C.4.2 DRAUGHT

The draught, measured to the datum waterplane as defined in D.2.2(b), shall not exceed 700 mm.

C.4.3 WEIGHT

When carrying out equipment inspection the weight of the boat in sailing condition, dry and with its heaviest rig shall be found using calibrated equipment and rounded to the nearest 0.01 kg. The weight shall be not more than the weight recorded on the certificate plus a tolerance of 0.05 kg.

C.5 HULL

C.5.1 LIMITATIONS

The geometry of the hull shall not be changed during an event.

C.5.2 IDENTIFICATION

The hull registration number shall be displayed on the external surface of the hull clearly and legibly with a minimum height of 20 mm.

C.6 HULL APPENDAGES

C.6.1 LIMITATIONS

The same hull appendages shall be used during an event when a hull appendage has been lost or damaged beyond repair. Such replacement may be made only with the approval of the race committee who shall then remove or cancel any event limitation mark attached to the replaced hull appendage.

C.6.2 USE (a) The hull appendages shall not be attached to the hull more than 15 mm from the centreplane. (b) No part of any hull appendage shall cut the datum waterplane as defined in D.2.2(b). (c) The hull appendages shall not be extendable or retractable.

C.7 RIG

C.7.1 LIMITATIONS

(a) Where the measured rig area recorded on the certificate is less than or equal to 10% of the maximum permitted sail area, the measured area of spars found as in I shall be less than or equal to that area recorded on the certificate.

Dra ft 201 5 V9.2 International Ten Rater Class Rules 20156 (b) Where the measured rig area recorded on the certificate is greater than 10% of the maximum permitted sail area, the cross widths of other spars found as in I shall comply with the certificate.

C.7.2 USE

The rig shall not project fore or aft of the hull in relation to the datum waterplane as defined in D.2.2(b).

C.8 SAILS

C.8.1 LIMITATIONS

(a) The dimensions of sails shall not exceed the dimensions of the sails recorded on the certificate.

(b) When carrying out equipment inspection sails shall be measured as in J except that the sail may be moved vertically on the grid to achieve compliance. (c) The minimum luff length of the largest sail of the certified rig shall not exceed 2400 mm and shall not be less than 1990 mm. (d) The minimum luff length of the largest sail of alternative rigs used when racing shall not be less than 990 mm. (e) For sails other than soft sails, the dimensions given by C.8.1. (c) and (d) apply to the distance from deck level to top point. (f) Sails shall not be reefed. (g) When a sail has been lost or damaged beyond repair it may be replaced only with the approval of the race committee who shall then remove or cancel any event limitation mark attached to a replaced sail.

C.8.2 IDENTIFICATION (a) Sail identification shall comply with the RRS. (b) The class insignia shall be “10R” of dimensions: height 24–30 mm; width, except “1”, 24–30 mm; thickness 5–8 mm and shall be displayed on the mainsail above a straight line between the three- quarter leech point and the nearest point on the luff.

C.8.3 USE

When a sail has a bolt rope or spar sliders they shall be set in a spar track.

Dra ft 201 5 V9.2 International Ten Rater Class Rules 20157 C.9 EQUIPMENT

C.9.1 PROHIBITED

(a) Automated control of rig and sails. (b) Automated steering. (c) On board cameras.

(d) The use of pictures from any source while racing.

C.9.2 USE

(a) Except for the establishment and maintenance of a radio control link, control unit positioning information, signal strength, and battery status information, no radio transmissions from the boat shall be used.

(b) Remote control and related equipment, if temporarily removed and/or replaced:

(1) shall be refitted in the same position.

(2) shall be replaced by equipment of similar weight.

Section D – Hull

D.1 GENERAL

D.1.1 RULES

The hull shall either comply with the class rules in force at the time of its initial certification measurement or comply with the current class rules.

D.1.2 CERTIFICATION See rule A.11. D.1.3 IDENTIFICATION

The hull registration number shall be marked in an easily visible location on a non-removable part of the hull by any of the following means: painting on, engraving in, bonding in, moulding in.

Dra ft 201 5 V9.2 International Ten Rater Class Rules 20158 D.2 HULL

D.2.1 LIMIT MARKS

(a) A forward and an aft waterline limit mark shall be placed on the outer surface of the hull across the centreplane, minimum size 30 mm long by 2 mm wide, and long enough to be easily visible with the boat afloat.

D.2.2 DEFINITIONS

(a) Measured Waterline Length The measured waterline length shall be taken as the distance between points formed by the intersection of the centreplane and the inboard edges of the waterline limit marks.

(b) Datum Waterplane The datum waterplane shall be taken as the horizontal plane through points formed by the intersection of the centreplane and the inboard edges of the waterline limit marks.

D.2.3 MATERIALS (a) Except in remote control equipment, the density of material shall not exceed that of lead (11,340 kg/m3).

(b) The forward 15 mm shall be of elastomeric material. From the foremost point of the hull to the point where the bow profile is 20 degrees to the datum waterplane, the vertical thickness of elastomeric material shall not be less than 5 mm.

D.2.4 CONSTRUCTION (a) The hull shall be a monohull. (b) With the following exceptions, hollows in the external surface of the hull are prohibited: (1) 40 mm or more above the datum waterplane. (2) 15 mm or less from the centreplane. (3) Trunking for hull appendages. (4) Inset transom and upper surface of deck. (5) Hollows which do not exceed 1 mm in depth when checked with a straight edge of length 300 mm.

Dra ft 201 5 V9.2 International Ten Rater Class Rules 20159 Section E – Hull Appendages

E.1 GENERAL

E.1.1 RULES

Hull appendages shall comply with the current class rules.

E.2 HULL APPENDAGES

E.2.1 MATERIALS

Materials shall not be of density higher than lead (11,340 kg/m3 ).

Section F – Rig

F.1 GENERAL

F.1.1 RULES Rigs shall comply with the current class rules.

F.2 MEASURED RIG AREA

See Section I.

Section G – Sails

G.1 GENERAL

G.1.1 RULES

Sails shall comply with the class rules in force at the time of their initial certification measurement.

G.1.2 CERTIFICATION

The official measurer shall

(a) certify sails at the tack,

(b) mark sails with the date of certification measurement,

(c) mark the tacks of the largest sails used together with their measured area,

(d) mark the tacks of alternative sails with the area of their parent sail.

Draft 2015 V9.2 International Ten Rater Class Rules 2015 10

G.2 MEASURED SAIL AREA

See Section J.

PART III – APPENDICES

The rules in Part III are open class rules. Measurement shall be carried out in accordance with the ERS except where varied in this part .

Section H – Rating and Weight

H.1 RATING FORMULA

Rating = L x S x 8

where L is the measured waterline length as defined in D.2.2(a). S is the sum of the measured rig area given in I.2 and the measured sail area given in J.2.

H.2 RATING

The boat shall have a rating no greater than 10.00 calculated as in H.1.

H.3 WEIGHT

The weight of the boat in sailing condition, dry and with its heaviest rig shall be found using calibrated equipment, rounded to the nearest 0.01 kg and recorded on the certification measurement forms.

Section I – Rig Area

I.1 GENERAL

(a) One boom with a maximum boom spar cross section not exceeding 22 mm may be used to extend the tack and/or clew of each sail without being included in the measured rig area. (b) Fittings not faired into a spar and no bigger than is reasonably required for their purpose shall not be included in the measured rig area. (c) Fittings faired into a spar or bigger than reasonably required for their purpose shall be considered to be part of the spar.

I.2 MEASURED RIG AREA

The measured rig area is the sum of the area of the components of the largest rig excluding (a) spars as in I.1 (a), (b) fittings as in I.1 (b) and (c), (c) rigging with a maximum cross section of less than 2 mm,

where (d) the area of each component shall be found as in I.3 or I.4,

unless the measured rig area exceeds 10% of the maximum permitted sail area when (e) the area of each component shall be found as in J.4

I.3 CONSTANT AND EVENLY TAPERED PROFILES

I.3.1 CALCULATION

The area of the spar, Am, is calculated as:

Am = h x (m0 + mn) / 2 where: h is the length of the spar above deck,

m0 is the fore-and-aft mast spar cross section or vertical boom spar cross section at one end,

mn is the fore-and-aft mast spar cross section or vertical boom spar cross section at the other end.

I.4 OTHER PROFILES

I.4.1 MEASUREMENT (a) Mast spars shall be placed over the measurement grid perpendicular to the grid lines and with a grid line at deck level. See figure K.1.1. (b) Other spars shall be placed over the measurement grid perpendicular to the grid lines and with a grid line at one end. See figure K.1.2. (c) The fore-and-aft mast spar cross sections or vertical boom spar cross sections, m0 to mn, shall be measured at and along all the grid lines that the spar cuts.

I.4.2 CALCULATION (a) The area of spar above the uppermost gridline cutting the spar, At, is calculated as:

At = 0.7 x mn x E where E is the height of the spar above the uppermost grid line. (b) The area of the spar, Am, is calculated as:

Am = 100 (m0 + mn) + 200 (m1 + m2 + … mn-1) + At

Section J – Sail Area

J.1 GENERAL

(a) During measurement:

(1) battens need not be removed, (2) sails may be attached to spars, (3) stays not exceeding 2 mm in diameter and inside luff tabling need not be removed. (4) tell tales shall be ignored for measurement purposes (b) Parts of stiffening which are less than 2 mm in diameter and not covered by sail material shall not be taken as parts of the sail. (c) Where a sail has a bolt rope the cross widths shall be taken to the aft edge of the spar. (d) Discontinuous attachments on the luff shall be disregarded for the purpose of measurement provided that their total length, measured along the luff, does not exceed 10% of the luff length and that the longest attachment is no more than twice the shortest.

J.2 MEASURED SAIL AREA

The measured sail area is the sum of the area of the largest sails used together.

J.3 SOFT SAILS

J.3.1 GENERAL

This method shall be used for soft sails with the exception of double luff sails.

J.3.2 MEASUREMENT (a) Where the sail has no clearly defined head point, tack point and/or clew point, permanently marked point(s) on the sail shall be used instead. (b) The sail shall be placed over the measurement grid with the clew point on a grid line and with the head point and tack point on a line perpendicular to the grid lines. See figure K.2.1. (c) If the tack point falls above the grid line on which the clew point is placed, the sail shall be moved vertically until the tack point is on a grid line. See Figure K.2.2. (d) The upper limit of area A1 shall be marked at the luff and leech where they pass over the grid line. See figure K.2.3.

(e) Cross widths, cm to cn, shall be measured from the leech to the luff and from the foot to the luff, or the leech to the foot, at and along all the grid lines which the sail cuts. See Figure K.2.3. (f) Hollows in the sail edges shall be bridged by a straight line and cross widths shall be taken to the bridging line. See Figure K.2.4.

J.3.3 CALCULATION (a) The major area, A1, is calculated as:

A1 = 100 (c0 + cn) + 200 (c1 + c2 + . . . cn-1)

(b) The head area, A2, is found from cn, cn-1 and E using a calculation contained in the measurement form where E is the height of the sail above the uppermost grid line. See Figure K.5 (c) The area below the luff perpendicular and above the lowest grid line, A3, is calculated as:

A3 = 10 (c 0 + cm) + 20 (c-0.2 + c-0.4 + . . . cm) (d) The area below the lowest grid line, A4, is calculated as:

A4 = c m x F (e) The sum of the areas, As, is calculated as: As = A1 + A2 + A3 + A4

J.4 OTHER SAILS

J.4.1 GENERAL (a) This method shall be used for : (1) sails other than soft sails, (2) double luff sail / spar combinations, (3) rig components where their combined area found using I.2 exceeds 10% of the maximum permitted sail area. (b) Small areas of supporting spar not enclosed by a sail, and end plates, shall be measured using Sections I and J if appropriate. Where the methods in Sections I and J are not appropriate, any suitable method may be used and the measurements and calculations shall be reported on the measurement form. (c) Each element of a group of elements, including those which retract into a parent, shall be measured as a separate item as in J.4.2. See figure K.3.1.

J.4.2 MEASUREMENT (a) Where the element has no clearly defined head point, tack point and/or clew point, permanently marked point(s) on the element shall be used instead. See figure K.3.2. (b) The element shall be placed over the measurement grid with the clew point on a grid line and with the head point and tack point on a line perpendicular to the grid lines. See figure K.3.2. (c) If the tack point falls above the grid line on which the clew point is placed the element shall be moved vertically until the tack point is on a grid line. See Figure K.2.2. (d) The luff and the leech shall be marked where they pass over the grid line. See figure K.3.3.

(e) Skin girths, g0 to gn , shall be measured from the leech to the luff and from the foot to the luff, or the leech to the foot, at and along all the gridlines which the sail cuts. See figure K.3.3. (f) The skin girth at each grid line shall be taken as the distance from the leech or foot , round the surface of the element through the corresponding point on the luff or foot, back to the same point. Any flaps shall be placed to give the greatest girth. See figure K.3.4.

(g) The half girth, cn, at a grid line is one half of the skin girth, gn, at that grid line. (h) Hollows in the element edges shall be bridged by a straight line and skin girths shall be taken to the bridging line. See Figure K.2.4.

J.4.3 CALCULATION

The area of the element, As, is calculated as in Section J.3.3.

Section H – Figures

K.1 SPAR MEASUREMENT K.1.1 , K.1.2 , K.1.3

K.2 SOFT SAIL MEASUREMENTS K.2.1. , K.2.2

K.2 SOFT SAIL MEASUREMENTS K.2.3. , K.2.4

K.3 OTHER SAILS K.3.1.

K.3 OTHER SAILS K.3.2. , K.3.3

K.4 WATERLINE LENGTH MEASUREMENT OF PLUMB ENDED YACHTS

K.5 CALCULATION OF AREA A2

K.1 SPAR MEASUREMENT K.1.1, K.1.2, K.1.3

Top point mn mn

mn-1 mn-1

K.1.1 At E

At

K.1.2

K.1.3

etc. Deck level

m2

m1

etc. etc. m0

m2 m2

m1 m1 100 mm m0 m0 = 0

Heel point

K.2 SOFT SAIL MEASUREMENTS K.2.1, K.2.2

E A2 A2 cn

100

A1 A1

A3 A4 A3 A4

o o 90 90 20

F F cm cm

K.2 SOFT SAIL MEASUREMENTS K.2.3, K.2.4

cn

Cn-1

J.3.2 (d) Mark upper cross width

etc. 100 J.3.2 (f) C4 Hollows in the sail edges shall be bridged by a straight C3 line and cross widths shall be taken to the bridging C2 line

C1

90 o C0 C-0.2 C-0.4 C-0.6 20

Draft 2015 V9.2 International Ten Rater Class Rules 2015 20

K.3 OTHER SAILS K.3.1

Element 1 Element 2

Element 1 Element 2 Element 3

Figure K.3.4

Skin girth

Draft 2015 V9.2 International Ten Rater Class Rules 2015 21

K.3 OTHER SAILS K.3.2, K.3.3

gn

gn-1

A2

Marked crosswidth measurement points

A1

g 5

100 mm g4

g3

g2

g1

mark A3 A4 90 o g0

gm 20 mm

Draft 2015 V9.2 International Ten Rater Class Rules 2015 22

K.4 Waterline length measurement of plumb ended yachts

Bow Bumper

Hull

Limit mark

Water

plane

Inboard edge of the forward waterline limit mark

Stern

Limit mark Hull

Water plane

Inboard edge of the aft waterline limit mark

Draft 2015 V9.2 International Ten Rater Class Rules 2015 23

∆ c - ∆ K.5. n Calculation of area A2

A 2 E

cn

100 mm

cn-1

∆ c – c ∆ = (E/100) ( n-1 n ) ‰ derived from the gradient of the leech

c + c ∆ ‰ trapezoidal rule A2 = 0,5 E ( n ( n – ))

A2 = 0,5 E ( c (2 + E/100) – E c /100) n n-1

Draft 2015 V9.2 International Ten Rater Class Rules 2015 24

Effective: 1st March 2016

Previous issues: March 2002.

© 2016, International Radio Sailing Association