IRC YEARBOOK 2009
26.7 Headsails reflected by the application of a power factor to the TCC.
Headsail area (HSA) shall be calculated from: 27.3.3 There is no limit to the static heel angle with ballast tanks
HSA = 0.125 * LL * (2 * LP + 3 * HHW + 2 * HTW) fully filled on one side of the boat or with movable ballast
In the calculation of HSA: moved fully to one side. For boats with water ballast, the
(a) HHW and HTW shall not be taken as less than 50% maximum weight of water that can be carried on each side of
and 25% respectively of LP. the boat shall be declared. For boats with moveable ballast,
(b) If HHB is greater than the larger of 0.09m or 0.008*LL, the maximum static heel angle in the Empty Weight I
R
then 5 times the excess shall be added to LL in the condition (see Rule 22.0) with the ballast moved fully to one
calculation of HSA. side shall be declared.
C
26.7.1 The following shall be declared: 27.3.4 Spare
R
(a) The luff length (LL), luff perpendicular (LP), half 27.4 Crew Number/Weight
U
width (HHW), and three-quarter width (HTW) of the 27.4.1 There is no limitation on crew numbers or weight under IRC
L
largest area headsail on board. except in the case of a short handed certificate (see Rule
E
(b) The longest luff length (LLmax) of any headsail 9.2), for one designs, and in races requiring boats to hold
on board. an ‘Endorsed’ certificate (see Rule 9.4). Attention is drawn
2
(c) The widest headsail top width (HHB) of any headsail to Rule 3.4.
0
on board. 27.4.2 Boats rated as one-designs, as noted on the boat’s
0
26.7.2 HSA, LP, HHW, and HTW of the largest area headsail, certificate, shall conform with their one-design class rules
9
LLmax and HHB will be shown on the boat's certificate. in respect of crew number/weight limitations unless freed
HSA, LLmax and HHB are the maximum permitted values. from this requirement by notice of race or sailing
26.8 Furling Headsails instructions. See also Rule 17.7
26.8.1 Boats may apply for a rating credit for using a single roller 27.4.3 In races requiring boats to hold ‘Endorsed’ certificates,
furling headsail. To be eligible: the crew number printed on each boat’s certificates shall
a) A boat shall be fitted with a complete headsail furling not be exceeded.
system including at least a drum, furling headfoil, and 27.4.4 In all other cases, the crew number printed on each boat's
top swivel. certificate is for information only, has no effect on TCC, and
b) Rated LP shall be greater than 1.3*J. has no relevance under these Rules unless invoked by
c) Only a single headsail shall be used while racing, notice of race and/or sailing instructions. Crew number may
except that additionally storm jibs as defined by Special be amended by notice of race or sailing instructions.
Regulation 4.26 (see Appendix 1, IRC Measurement 27.4.5 Race committees may invoke crew limitations, by number
Definitions) may be used. or by weight, in the notice of race and/or sailing
26.8.2 A boat may declare that she may alternatively use a heavy instructions.
weather jib as defined by Special Regulation 4.26 (see 27.5 Crew Classification
Appendix 1, IRC Measurement Definitions). Provided that
27.5.1 There are no rules on the classification of crew within IRC
she complies with Rule 26.8.1 a) and b), she will remain unless stated in a Notice of Race.
eligible for the rating credit but at a reduced rate.
26.8.3 Except in the cases of significant damage or storm and/or 28 SEAWORTHINESS AND SAFETY
heavy weather jibs as appropriate, the same headsail shall
28.1 The issue of a rating certificate does not imply that a boat is
be used for all races in any series of races.
necessarily of satisfactory design, safe or seaworthy. See Rule 3.
26.8.4 Any other headsail may be on board.
28.2 Race committees may impose limits for race entry on safety
grounds at their discretion. An SSS Base Value, specific to the
27 EQUIPMENT AND LOADING boat, and when data is available IRC/ISO STIX, AVS, and IRC/ISO
27.1 The rated parameters assume that the boat is fitted out at least Design Category will be printed on each boat's certificate for the
to the production specification and/or to the condition when last guidance of owners and race organisers.
measured/inspected. Detachable items (such as but not limited to
bunk cushions) permitted by Rule 22 to be aboard for measurement 29 DAYBOATS
shall be carried in their normal positions while racing. If another
29.1 A Dayboat is defined as a boat which cannot meet any of Categories
rating certificate is being used as the basis for data then any
0 to 4 of the Offshore Special Regulations. The Rating Authority
changes since the issue of that certificate shall be notified to the
reserves the right to re-classify any boat without stating a reason.
Rating Authority.
29.2 A Dayboat will be designated by a ‘D’ printed on the certificate
27.2 Hull Factor
adjacent to the TCC.
27.2.1 Hull factor (HF) is an assessment by the Rating Authority
29.3 A Dayboat shall be self righting at 60
0
of heel.
of the features of the boat and their character and efficiency
29.4 The following items shall be carried by a Dayboat when racing
when compared to a basic cruising configuration.
under IRC:
27.2.2 Stripped out interiors, the use of light and hi-tech structures
29.4.1 A bilge pump and bucket.
and/or materials, removal of furniture or other fitted
29.4.2 An engine or two paddles or a pair of oars.
equipment, etc. may lead to the application of higher
29.4.3 One anchor and suitable warp.
than standard hull factor to compensate for potential
29.4.4 A compass.
increase in performance. Such features shall be declared
29.4.5 One life jacket and whistle for each crew member.
to the Rating Authority.
29.4.6 Two red hand flares.
27.3 Movable And Variable Ballast
27.3.1 A boat may request permission from the Rating Authority to
Part 4 IRC, advertising not permitted
use movable and/or variable ballast for the purpose of
increasing stability. The Rating Authority will generally only
30 RULES
grant permission to boats specifically and originally
30.1 With the exception of Rule 18, Advertising, the IRC Rules Part 3
designed to carry movable and/or variable ballast and
shall apply.
may deny permission without giving any reason. RRS 51,
31 ADVERTISING
Moving Ballast, and 52, Manual Power, are modified in
31.1 Advertising displayed on hulls, spars and sails is restricted to
respect of movable and/or variable ballast systems to the
advertising permitted by ISAF Regulation 20, Advertising Code,
extent required by this class Rule.
paragraph 20.9 only.
27.3.2 Any such system shall be declared on a boat's rating
application, will be noted on the rating certificate, and will be
43
IRC 09 Rules P33-43_bs.indd 43 1/12/08 09:10:59
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