IRC YEARBOOK 2010
IRC
APPENDIX 1
MEASUREMENT
OCEAN SAFETY IRC MEASUREMENT DEFINITIONS
Measurement Note:ISAF Equipment Rules of Sailing (ERS) Part II, Definitions, shall apply to measurement except as stated by IRC Rules or this
Appendix. Measurements shall be taken in accordance with ERS Part III, Measurement Rules, Section H.
Terminology A term used in its defined sense is printed in “bold” type if defined in the ERS. Any abbreviation given below is used in IRC Rules in its
defined term unless specified otherwise.
Age Date – The year in which the boat was first launched, or the year in by a 25mm band of contrasting colour. If there is no band, the
which the boat was re-launched following hull modification, whichever measurement shall be taken to the aft end of the boom.
is the later.
FL – The forestay length measured from the forward end of J to the
Batten – Any material added to the sail, as either a removable element, higher of either:
permanent stiffening, or other contrivance, the purpose of which is to (a) the forestay rigging point, or:
DEFINITIONS
support and/or stiffen the sail. (b) if a headsail may be set forward of the forestay, the intersection
of the spar and the lower edge of the halyard used to hoist the
BO – The longitudinal distance between the foremost point on the hull and
headsail, when at 90° to the spar, extended as necessary.
the foremost point of the waterline.
h – The vertical distance between the waterline and the lowest point on
Dayboat – A Dayboat is defined as a boat which cannot meet any of
the stem at a tangent of 45° to the longitudinal axis.
Categories 0 to 4 of the Offshore Special Regulations. The Rating
Authority reserves the right to re-classify any boat without stating Headsail RRS 50.4 shall not apply. Any sail tacked down forward of the
a reason. foremost mast which does not meet the definition of a spinnaker.
E – The outer point distance of a mainsail (or in the case of a schooner,
HHB – The widest top width of any headsail on board.
a foresail). The outer limit mark shall be permanently marked by a
25mm band of contrasting colour. If there is no band, the measurement
HHW – The half width of the largest area headsail.
shall be taken to the aft end of the boom.
HSA – The maximum permitted headsail area.
EY – The outer point distance of a mizzen (or in the case of a schooner,
a mainsail). The outer limit mark shall be permanently marked
HTW – The three-quarter width of the largest area headsail.
50
Measurement Defs.indd 50 26/11/09 16:50:01
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