IRC YEARBOOK 2010
21.6.4 STL is rated relative to a base length of 0.456*SPA^0.5. any reason. RRS 51, Moving Ballast, and RRS 52, Manual
Variations from base STL will result in variation in a boat’s Power, are modified in respect of movable ballast and/
TCC appropriate to the change in length. or variable ballast systems to the extent required by this
21.7 Headsails class Rule.
Headsail area (HSA) shall be calculated from: 22.3.2 Any such system shall be declared on a boat’s rating
HSA = 0.125 * LL * (2 * LP + 3 * HHW + 2 * HTW) application, will be noted on the rating certificate, and will
In the calculation of HSA: be reflected by the application of a power factor to the TCC.
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(a) HHW and HTW shall not be taken as less than 50% and 22.3.3 There is no limit to the static heel angle with ballast tanks
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25% respectively of LP. fully filled on one side of the boat or with movable ballast
(b) If HHB is greater than the larger of 0.09m or 0.008*LL, moved fully to one side. For boats with variable ballast,
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then 5 times the excess shall be added to LL in the the maximum weight of water that can be carried on each U
calculation of HSA.. side of the boat shall be declared. For boats with movable
L
21.7.1 The following shall be declared. LL, LP, HHW, HTW, LLmax ballast, the maximum static heel angle in the boat weight
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and HHB condition (see Rule 17) with the ballast moved fully to one
21.7.2 HSA, LP, HHW, and HTW of the largest area headsail, side shall be declared.
2
0
LLmax and HHB will be shown on the boat’s certificate. 22.4 Crew Number/Weight
1
HSA, LLmax and HHB are the maximum permitted values. 22.4.1 There is no limitation on crew numbers or weight under IRC
0
21.8 Furling Headsails except in the case of a short handed certificate (see Rule
21.8.1 Boats may apply for a rating credit for using a single roller 8.2), for one-designs, and in races requiring boats to hold
furling headsail. To be eligible: an ‘Endorsed’ certificate (see Rule 8.4). Attention is drawn
a) A boat shall be fitted with a complete headsail furling to Rule 3.4.
system including at least a drum, furling headfoil, and 22.4.2 Boats rated as one-designs, as noted on the boat’s
top swivel. certificate, shall conform with their one-design class rules
b) Rated LP shall be greater than 1.3*J. Exceptionally, this in respect of crew number/weight limitations unless freed
rule shall not apply to boats of LH greater than 30.5m from this requirement by Notice of Race. See also Rule 13.7.
and with IRC DLR greater than 60. 22.4.3 In races requiring boats to hold ‘Endorsed’ certificates, the
c) Only a single headsail shall be used while racing, crew number printed on each boat’s certificates shall not
except that additionally storm jibs (see Appendix 1, be exceeded.
IRC Measurement Definitions & Abbreviations) may 22.4.4 In all other cases, the crew number printed on each boat’s
be used. certificate is for information only, has no effect on TCC, and
21.8.2 A boat may declare that she may alternatively use a heavy has no relevance under these Rules unless invoked by
weather jib (see Appendix 1, IRC Measurement Definitions notice of race. Crew number may be amended by Notice
& Abbreviations). Provided that she complies with Rule of Race.
21.8.1(a) and (b), she will remain eligible for the rating credit 22.4.5 Race committees may invoke crew limitations, by number
but at a reduced rate. or by weight, in the Notice of Race.
21.8.3 Except in the cases of significant damage or storm jib and/ 22.4.6 Rule 22.4 may be amended by Notice of Race.
or heavy weather jibs as appropriate, the same headsail 22.5 Crew Classification
shall be used for all races in any series of races. 22.5.1 There are no rules on the classification of crew within IRC
21.8.4 Any other headsail may be on board. This Rule may be unless stated in a Notice of Race.
amended by Notice of Race.
23 SEAWORTHINESS AND SAFETY
22 EQUIPMENT AND LOADING
23.1 The issue of a rating certificate does not imply that a boat is
22.1.1 The rated parameters assume that the boat is fitted out at
necessarily of satisfactory design, safe or seaworthy. See Rule 3.
least to the production specification and/or to the condition
23.2 Race committees may impose limits for race entry on safety
when last measured/inspected. Detachable items (such as
grounds at their discretion. An SSS number, specific to the boat,
but not limited to bunk cushions) permitted by Rule 17 to
and when data is available IRC/ISO STIX, AVS, and IRC/ISO
be aboard for measurement shall be carried in their normal
Design Category will be printed on each boat’s certificate for the
positions while racing. If another rating certificate is being
guidance of owners and race organisers.
used as the basis for data then any changes since the issue
of that certificate shall be notified to the Rating Authority.
24 DAYBOATS
22.1.2 For races requiring compliance with Offshore Special
24.1 A Dayboat will be designated by a ‘D’ printed on the certificate
Regulations Category 4 only (or local equivalent), a Notice
adjacent to the TCC.
of Race may state that boats rated with bunk cushions on 24.2 A Dayboat shall be self righting at 60° of heel..
board may remove the bunk cushions. No compensating 24.3 The following items shall be carried by a Dayboat when racing
weight need be carried. under IRC:
22.2 Hull Factor 24.3.1 A bilge pump and bucket.
22.2.1 Hull factor (HF) is an assessment by the Rating Authority of 24.3.2 An engine or two paddles or a pair of oars.
the features of the boat and their character and efficiency 24.3.3 One anchor and suitable warp.
when compared to a basic cruising configuration. 24.3.4 A compass.
22.2.2 Stripped out interiors, the use of light and hi-tech structures 24.3.5 One life jacket and whistle for each crew member.
and/or materials, removal of furniture or other fitted equip- 24.3.6 Two red hand flares.
ment, etc, may lead to the application of higher than standard
hull factor to compensate for potential increase in perform- Part D IRC, advertising not permitted
ance. Such features shall be declared to the Rating Authority.
22.3 Movable Ballast and Variable Ballast 25 RULES
22.3.1 A boat may request permission from the Rating Authority 25.1 With the exception of Rule 18, Advertising, the IRC Rules Part C
to use movable ballast and/or variable ballast for the shall apply.
purpose of increasing stability. The Rating Authority will 26 ADVERTISING
generally only grant permission to boats specifically 26.1 Advertising displayed on hulls, spars and sails is restricted to
and originally designed to carry movable ballast and/or advertising permitted by ISAF Regulation 20, Advertising Code,
variable ballast and may deny permission without giving paragraph 20.9 only.
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RULE TEXT.indd 49 27/11/09 10:18:55
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