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FL – The forestay length measured from the forward end of J to the forestay rigging point.


J – The longitudinal distance between the intersection of the fore side of the mast spar, extended as necessary, and the deck including any superstructure; and the intersection of the centreline of the forestay, extended as necessary, and the deck, or bowsprit spar.


STL – The greatest horizontal distance from the forward face of the mast spar, measured on or near the centreline of the boat, to any of the following: • the extremity of the spinnaker pole, whisker pole or bowsprit; • the spinnaker tack point on deck projected vertically as necessary; • if a headsail may be tacked forward of the forestay, the headsail tack point on deck projected vertically as necessary or to the extremity of the bowsprit.


Aft rigging – The total number of stays and/or sets of stays connected to the mast spar above the top of the boom set horizontal providing aft support and/or control. (a) Any pairs of stays attached to the mast spar at the same position port and starboard on the mast spar shall count as one set of stays. E.g, whether there be a single standing backstay or twin running backstays these are counted as one set of stays.


(b) Any deflectors or adjusters attached between the top most stay and the mast spar shall also be counted. Any deflectors or adjusters attached between any other stay and the mast spar with separation from the attachment point of the primary stay of 10% of P or greater shall also be considered as a separate stay for these purposes.


SAILS – GENERAL


Spinnaker – RRS 50.4 shall not apply. A spinnaker is defined as a sail set forward of the foremost mast with half width (measured as a spinnaker) equal to or greater than 75% of foot length and without battens. A spinnaker may be set reefed by any means while racing under IRC provided that when measured in any reefed condition it continues to satisfy the IRC definition of a spinnaker.


Headsail – RRS 50.4 shall not apply. Any sail tacked down forward of the foremost mast which does not meet the definition of a spinnaker. A headsail may be hoisted from above the forestay rigging point.


Batten – Any material added to the sail, as either a removable element, permanent stiffening, or other contrivance, the purpose of which is to support and/or stiffen the sail.


HWJ – Heavy Weather Jib. See OSR paragraph 4.26. Storm Jib – See OSR paragraph 4.26.


SAILS – HEADSAILS HSA – The maximum permitted headsail area.


HLU – The luff length of the largest area headsail on board and which may be used while racing.


HLUmax – The longest luff length of any headsail on board and which may be used while racing. LLY – The longest luff length of any mizzen staysail.


HLP – The luff perpendicular of the largest area headsail on board and which may be used while racing. LPY – The longest luff perpendicular of any mizzen staysail. HHW – The half width of the largest area headsail. HTW – The three-quarter width of the largest area headsail. HUW – The seven-eighths width of the largest area headsail.


Foot Offset – The maximum offset between the edge of a headsail foot and a straight line between tack point and clew point.


Cutter Rig – A cutter rigged boat is any boat that sets more than one headsail when on a beat to windward while racing. These values will be used


in place of standard headsail dimensions where relevant in IRC Rules for a cutter rigged boat.


Cutter Rig HLU – Headsail luff length measured parallel to the forestay as the distance from the lowest tack point to the highest head point of any headsails set simultaneously while racing on a beat to windward.


Cutter Rig HLUmax – As Cutter Rig HLU.


Cutter Rig HLP – The shortest distance from the aftmost clew point of any headsail when set on the centreline of the boat, to the foremost headsail luff which may be set simultaneously while racing on a beat to windward.


Cutter Rig HHW – The greater of 50% of Cutter Rig HLP or HHW of the largest area headsail.


Cutter Rig HTW – The greater of 25% of Cutter Rig HLP or HTW of the largest area headsail.


Cutter Rig HUW – The greater of 12.5% of Cutter Rig HLP or HUW of the largest area headsail.


SAILS – MAINSAIL


MHW – The half width of the mainsail. MTW – The three-quarter width of the mainsail. MUW – The seven-eighths width of the mainsail.


SAILS – SPINNAKER


SPA – The maximum permitted spinnaker area. SLE – The leech length of the largest area spinnaker on board. SLU – The luff length of the largest area spinnaker on board. SFL – The foot length of the largest area spinnaker on board. SHW – The half width of the largest area spinnaker on board.


New sail abbreviations referenced to old IRC & ORC IRC from Old


ERS MAINSAIL


G.7.4 (a) Mainsail quarter width (1/4) G.7.5 (a) G.7.6 (a)


Mainsail half width (1/2)


G.7.7 (a) Mainsail upper width (7/8) G.7.8 (a) Mainsail top width


G.7.3 MQW - MGL MHW MHW MGM


Mainsail three quarter width (3/4) MTW MTW MGU MUW MUW MGT MHB


-


HEADSAIL Longest luff of any headsail Headsail luff length


G.7.4 (a) Headsail quarter width (1/4) G.7.5 (a) G.7.6 (a)


Headsail half width (1/2)


G.7.7 (a) Headsail upper width (7/8) G.7.8 (a) Headsail top width G.7.11


G.7.3 G.7.2 G.7.1


G.7.3 G.7.2 G.7.1


G.7.3 G.7.11 Headsail luff perpendicular


Foot Offset if greater than 7.5% LP SYMMETRIC SPINNAKER


Symmetric spinnaker luff Symmetric spinnaker leech Symmetric spinnaker foot


G.7.5 (b) Symmetric spinnaker half width ASYMMETRIC SPINNAKER


Asymmetric spinnaker luff Asymmetric spinnaker leech Asymmetric spinnaker foot


Mizzen staysail luff


SLU SLE SFL


SHW


SLU SLE SFL


G.7.5 (b) Asymmetric spinnaker half width SHW MIZZEN STAYSAIL


LLY Mizzen staysail luff perpendicular LPY


SLU SLE SF


SLU SLE SF


LLY LPY


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SL SL SF


SHW SMG


SLU SLE ASF


SHW AMG LL HB


HLU Max LLmax - HLU


HQW - Headsail three quarter width (3/4) HTW JL JGL


HHW HHW JGM HTW JGU


HUW HUW JGT HHB HLP


- LP JH LPG 2016 IRC ORC


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