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If foot offset is greater than 7.5% of HLP, then foot offset shall be declared and foot offset shall be added to HLU in the calculation of HSA.

21.7.2 The following shall be declared: HLU, HLP, HHW, HTW, HUW and HLUmax.

21.7.3 HSA, HLU, HLP, HHW, HTW and HUW of the largest area headsail, and HLUmax will be shown on the boat’s certificate. HSA and HLUmax are the maximum permitted values.

21.7.4 Any number of headsails may be set simultaneously when racing under IRC provided that headsail data is measured and declared as defined in Appendix 1.

21.8 Furling Headsails 21.8.1 Boats may apply for a rating credit for using a single roller furling headsail. To be eligible: (a) A boat shall be fitted with a complete headsail furling system including at least a drum, furling headfoil, and top swivel.

(b) Rated HLP shall be greater than 1.3*J. Exceptionally, this Rule shall not apply to boats of LH greater than 30.5m and with IRC DLR greater than 60.

(c) Only a single headsail shall be used while racing, whose HSA may not be less than 95% of rated HSA except that alternatively a storm jib (see Appendix 1) may be used.

21.8.2 A boat may declare that she may alternatively use a heavy weather jib (see Appendix 1). Provided that she complies with Rule 21.8.1(a) and (b), she will remain eligible for the rating credit but at a reduced rate.

21.8.3 Except in the cases of significant damage or a storm jib or heavy weather jib as appropriate, the same headsail shall be used for all races in any series of races.

21.8.4 Any other headsail may be on board. This Rule may be amended by Notice of Race.


22.1 Detachable Items 22.1.1 Detachable items (such as but not limited to bunk cushions) permitted by Rule 17 to be aboard for measurement shall be carried in their normal positions while racing. For races requiring compliance with OSR Category 4 only (or local equivalent), a Notice of Race may state that boats rated with bunk cushions on board may remove the bunk cushions. No compensating weight need be carried.

22.2 Hull Factor 22.2.1 Hull Factor (HF) is calculated by the Rating Authority and is an evaluation of features of the boat and their character and efficiency.

22.2.2 Stripped out interiors, the use of light and high-tech structures and/or materials, removal of furniture or other fitted equipment, etc, may lead to the application of higher than standard Hull Factor to compensate for potential increase in performance. Such features shall be declared to the Rating Authority.

22.2.3 The rated Hull Factor assumes that the boat is fitted out at least to the production specification and materials and/or to the condition when last measured/inspected. This does not negate owners’ responsibilities under Rules 8.9, 22.2.2 and RRS 78.1.

22.3 Moveable Ballast and Variable Ballast 22.3.1 A boat may request permission from the Rating Authority to use moveable ballast and/or variable ballast for the purpose of increasing stability. The Rating Authority will generally only grant permission to boats specifically and originally designed to carry moveable ballast and/or variable ballast and may deny permission without giving any reason. RRS 51, Moving Ballast, and RRS 52, Manual Power, are modified in respect of moveable ballast and/or variable ballast systems to the extent required by this Class Rule.

22.3.2 Any such system shall be declared to the Rating Authority. 22.3.3 There is no limit to the list angle with ballast tanks fully filled on one side of the boat or with moveable ballast moved fully to one side. For boats with variable ballast, the maximum weight of water that can be carried on each side of the boat shall be declared. For boats with moveable ballast, the maximum list angle in the boat weight condition (see Rule 17) with the ballast moved fully to one side shall be declared. A physical, mechanical limit shall be fitted to moveable ballast to prevent it being moved further than the position for the declared list angle. Such a system shall not rely on sensors or measurement to prevent the declared list angle being exceeded unintentionally.

22.4 Crew Number/Weight 22.4.1 Boats rated as one-designs, as noted on the boat’s certificate, shall conform with their one-design class rules in respect of Crew Number/weight limitations unless freed from this requirement by Notice of Race. See also Rule 13.7

22.4.2 The crew weight shall not exceed 85kg multiplied by the Crew Number printed on the certificate. This Rule does not apply to short-handed certificates issued under Rule 8.2.1. 22.4.3 Rule 22.4 may be amended by Notice of Race.

22.5 Crew Classification 22.5.1 There are no rules on the classification of crew within IRC unless stated in a Notice of Race.


23.1 The issue of a rating certificate does not imply that a boat is necessarily of satisfactory design, safe or seaworthy nor that a boat complies with any category of Offshore Special Regulations. See Rule 3.

23.2 Race Committees may impose limits for race entry on safety grounds at their discretion. An SSS number, specific to the boat, and when data is available IRC/ISO STIX, AVS and IRC/ISO Design Category will be printed on each boat’s certificate for the guidance of owners and Race Organisers. Deleted for 2018.




25.1 With the exception of Rule 16, Advertising, the IRC Rules Part C shall apply.


26.1 Competitors’ advertising displayed on the boat is not permitted in accordance with World Sailing Regulation 20, Advertising Code.


▲ For more information on World Sailing Rules see ▲ Equipment Rules of Sailing:

▲ Offshore Special Regulations:

▲ Or download the free rules app for iOS, Android and Windows by searching for World Sailing.

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