IRC YEARBOOK 2010
21.1.5 There is no limitation on the number or type of sails on board while 21.3.3 RRS 50.3(a) is amended to the extent that a spinnaker may
racing under IRC except: be tacked to a bowsprit. A headsail may only be tacked to a
(a) the limitation on spinnaker numbers (see Rule 21.6.2). bowsprit if J is measured to the headsail tack attachment
(b) the limitation on sails containing exotic materials (see point on the bowsprit. See the definition of J.
Rule 21.4). 21.3.4 RRS 50.3(c) is deleted and replaced by:
(c) the limitation on headsail numbers for boats rated A headsail may be sheeted or attached at its clew or tack to
with a single furling headsail. Except in the cases of a spinnaker pole or whisker pole, provided:
significant damage or storm and heavy weather sails, a) that a spinnaker is not set,
boats claiming a rating allowance for using a single b) that the HSA and LLmax dimensions do not exceed the
roller furling headsail shall use the same headsail for rated values,
all races in any series of races. (See Rule 21.8.1) c) that for a boat rated with no spinnakers that a whisker U
(d) during a regatta run on consecutive days, including any pole is declared
lay days, the sails on board shall remain the same and d) that the pole length measured as spinnaker tack length
be on board for all races. This Rule may be amended (STL) does not exceed the rated STL,
by Notice of Race. e) that for a boat rated under Rule 21.3.6(a) with no
(e) a spare mainsail may be on board but may not be used spinnaker pole, the whisker pole (measured as STL)
as a racing replacement, either during a race or during shall not exceed the rated STL.
a regatta run on consecutive days, including any lay A second headsail may be set simultaneously.
days. This Rule may be amended by Notice of Race. 21.3.5 If a spinnaker can be tacked to a bowsprit in front of
(f) exceptionally, in the case of significant damage or loss, the forestay, the bowsprit will be considered to be a
sails may be replaced with similar sails. A Notice of spinnaker pole and STL measured as the greater of the
Race may require that boats obtain permission from length of the longest spinnaker pole or to the extremity of
the Race Committee before replacing a sail. This Rule the bowsprit.
may be amended by Notice of Race. 21.3.6 Boats will be rated according to whether they use a
(g) sails shall be set in close proximity to the boat. spinnaker pole and/or a bowsprit according to the
21.1.6 (a) Adjustment or detachment of forestay and/or shrouds following configurations
including diagonal and jumper shrouds, or movement a) No spinnaker pole (spinnaker tacked on deck) or a
of the mast at the foot or the deck while racing is not centre line bowsprit only.
permitted except: b) An articulating bowsprit only.
(i) in the case of a boat without running backstays, c) A spinnaker pole or poles either with or without a
checkstays or adjustable backstay when the bowsprit.
forestay may be adjusted but not detached. 21.4 Sailcloth
(ii) in the case of Dayboats explicitly permitted by their 21.4.1 Sailcloth containing exotic materials (at present none) will
own class rules to adjust or detach the forestay and carry an additional rating tax.
shrouds while racing.
21.4.2 Sailcloth containing exotic materials shall be declared on
(iii) as permitted by Rule 21.1.6 (b).
initial application for rating, revalidation, or when amending
. (b) A boat fitted with or carrying on board systems, to
a boat’s sail inventory.
adjust the forestay or the mast foot while racing
21.4.3 Only specific sails containing exotic materials which have
shall declare this to the Rating Authority. Locked con-
been declared and noted on a boat’s certificate may be
ventional turnbuckles need not be declared. Unless
used while racing under IRC.
the boat declares that such systems will not be used
while racing, the boat may then adjust the forestay
21.5.1 Unless declared as greater under Rule 21.5.2 or lesser
and the mast foot vertically and/or longitudinally while
under Rule 21.5.3, MUW, MTW, and MHW will be assumed
racing, but shall not detach the forestay.
to be 0.22*E, 0.38*E and 0.65*E respectively.
21.2 Rig Factor
21.5.2 MUW measurements in excess of 0.22*E, MTW measure-
21.2.1 Rig factor (RF) is an assessment by the Rating Authority of
ments in excess of 0.38*E, and MHW measurements in
the rig and sail features of the boat and their character and
excess of 0.65*E shall be declared.
efficiency when compared to a basic cruising configuration
21.5.3 MUW measurements less than 0.22*E to a lower limit of
with substantial spars and basic rig controls.
0.125*E may be declared. MTW measurements less than
21.2.2 RF above unity may be applied for: fractional, racing and
0.38*E to a lower limit of 0.25*E may be declared. MHW
lightweight rigs, high aspect ratio and efficient plan forms,
measurements less than 0.65*E to a lower limit of 0.50*E
wing and double luff sails, specialised sail stiffening,
may be declared.
large headboards/cranes, permanently bent or highly
controllable spars, hi-tech rigging, exotic rig materials,
21.6.1 Spinnakers are rated relative to a base area appropriate to
advanced winch and deck gear arrangements, flush/
a boat of the particular type and size. Any spinnaker will be
efficient deck design, and any other feature which
rated equitably relative to this base size.
increases sailing efficiency that is not already rated through
21.6.2 (a) Boats carrying more than three spinnakers in total on
the rated dimensions.
board while racing will incur an increase in rating.
21.2.3 RF below unity may be applied to less efficient rigs and sail
(b) A Rule Authority may prescribe that for races under its
plans, cruising furling sails, motor sailers with large deck
jurisdiction requiring compliance with ISAF Special
houses, cruisers with weight/windage aloft or with basic deck
Regulations Category 3 or above, a boat may carry
gear only, or any other feature which reduces sailing efficiency
one more spinnaker than shown on her current IRC
that is not already rated through the rated dimensions.
certificate of area not greater than rated SPA without
21.2.4 Full rig details shall be supplied at the time of rating
an increase in rating. Any such prescription shall be
application. The Rating Authority reserves the right to apply
referenced in a Notice of Race.
a high rig factor until full detail is supplied.
21.6.3 Spinnaker area (SPA) shall be calculated from:
21.3 Sheeting of Sails, Sail Definitions, Bowsprits and Spinnaker Poles
SPA = ((SLU + SLE)/2) * ((SF + (4 * SHW))/5) * 0.83
21.3.1 No headsail or spinnaker may be sheeted from more than
SLU, SLE, SF and SHW of the largest area spinnaker on
one point on the sail.
board shall be declared. The calculated area of this
21.3.2 All sails shall be set and sheeted in accordance with RRS
spinnaker will be shown on a boat’s certificate as the max-
50, Setting and Sheeting Sails, with the following additions.
imum permitted SPA.
RULE TEXT.indd 47 27/11/09 10:18:53
| Page 2
| Page 3
| Page 4
| Page 5
| Page 6
| Page 7
| Page 8
| Page 9
| Page 10
| Page 11
| Page 12
| Page 13
| Page 14
| Page 15
| Page 16
| Page 17
| Page 18
| Page 19
| Page 20
| Page 21
| Page 22
| Page 23
| Page 24
| Page 25
| Page 26
| Page 27
| Page 28
| Page 29
| Page 30
| Page 31
| Page 32
| Page 33
| Page 34
| Page 35
| Page 36
| Page 37
| Page 38
| Page 39
| Page 40
| Page 41
| Page 42
| Page 43
| Page 44
| Page 45
| Page 46
| Page 47
| Page 48
| Page 49
| Page 50
| Page 51
| Page 52
| Page 53
| Page 54
| Page 55
| Page 56
| Page 57
| Page 58
| Page 59
| Page 60
| Page 61
| Page 62
| Page 63
| Page 64
| Page 65
| Page 66
| Page 67
| Page 68