Age Date

The year in which the boat was first launched, or the year in which the boat was re-launched following modification, whichever is the later.

Beam  

The maximum horizontal dimension of the boat in any transverse section, excluding any rubbing strake or toerail.

BO  

The horizontal distance from the forward point of LWP to the forward limit of LOA, in the condition of Empty Weight.

Draft  

The maximum depth of the boat or any of its appendages below the waterplane, in the condition of Empty Weight (see Rule 22.0). In the case of any movable appendage, which is not fixed down while racing, the minimum depth is also required.

E  

The foot of the mainsail measured along the top of the boom set on the centre line and at right angles to the mast, from the back of the mast to the inside of a permanent 25 mm band of contrasting colour beyond which the mainsail clew point shall not be set. If there is no band the measurement shall be taken to the aft end of the boom.

EY  

The foot of the mizzen sail measured as for E.

Empty Weight  

The weight of the boat to the nearest 10 kg, in the condition of Empty Weight, less the weight of any deductions to the nearest I kg. See IRC rules for Empty weight condition.

FL  

The forestay length measured from where the forestay meets the deck, or from the jib outhaul in the case of a bowsprit, to the forestay attachment point on the front of the mast or to where the forestay intersects the front of the mast, projected if necessary.

h  

The vertical distance from the waterplane to the lowest point on the stem at a tangent of 450 to the horizontal, in the condition of Empty Weight.

Heavy Weather Jib  

A headsail which complies with ORC Special Regulations Paragraph 4.24: A heavy-weather jib of area not greater than 13.5% height of the foretriangle squared and without reef points.

HHW  

Headsail Half Width of the largest area headsail measured as the shortest distance between the half leech point and the luff.

Internal Ballast  

Lead or other material, or equipment, not in the keel and bulb, which has no practical function in the boat other than to increase weight or to adjust fore and aft trim.

J  

The base of the fore-triangle measured as the horizontal distance from the front of the mast at deck level to the point where the forestay meets the deck, projected if necessary.

LL  

The luff length of the largest area headsail when stretched sufficiently to remove any creases.

LLY  

The longest luff length of any mizzen staysail, measured as for LL.

LOA  

The length overall of the hull excluding bowsprit and other rigging if any, stem fittings, stern fittings, pulpits, any overhanging rudder and rudder hangings.

LP  

The luff perpendicular of the largest area headsail measured as the shortest distance from the clew point to the outside of the luff or luff tape. For a cutter rig with more than one forestay, LP is measured as the shortest distance from the aftmost clew point of any jib or headsail when set on the centre line of the boat, to the foremost forestay.

LPY  

The longest luff perpendicular of any mizzen staysail, measured as for LP.

LWP  

Length on waterplane in the condition of Empty Weight.

MHW  

The half width of the mainsail, measured as the shortest distance between the half leech point and the luff, bridging any hollows in the leech of the sail.

MTW  

The three quarter width of the mainsail, measured as the shortest distance between the three quarter leech point and the luff, bridging any leech hollows as above.

Movable Ballast  

Water or other ballast which can be varied in quantity and/or transferred from one part to another part of the boat.

P  

The hoist of the mainsail measured on the mast, from the top of the boom when set at right angles to the mast or the corresponding top of a permanent 25 mm band of contrasting colour, and the bottom of a similar 25 mm band at the top of the mast above which the mainsail shall not be hoisted. If there is no top band the measurement shall be taken to the top bearing surface of the halyard shackle.

PY  

The hoist of the mizzen sail measured as for P.

Series Date  

The year in which the first boat of the class or production series was launched.

SF  

The foot length of the largest area spinnaker carried, measured between the clew points.

SHW  

The half width of the largest area spinnaker carried, measured between the half leech points.

SLE  

The leech length of the largest area spinnaker carried, measured from the clew point to the head point.

SLU  

The luff length of the largest area spinnaker carried, measured from the tack point to the head point.

SO  

The horizontal distance from the aft point of LWP to the aft limit of LOA, in the condition of Empty Weight.

SPA  

The maximum permitted spinnaker area.

STL  

The length of the longest spinnaker pole, whisker pole or bowsprit measured on or near the centre line of the boat from the forward face of the mast tube to the extremity of the spinnaker pole, whisker pole or bowsprit, or the horizontal length from the forward face of the mast tube at deck level to the spinnaker tack point on deck, projected vertically as necessary, which ever is the greatest.

Storm Jib  

A headsail which complies with ORC Special Regulations Paragraph 4.24: A storm jib of area not greater than 5% height of the foretriangle squared, and luff maximum length 65% height of the foretriangle.

Water Ballast  

Movable ballast as defined above.

Wingspan  

The maximum horizontal width in any transverse section of any wing, wings or bulb attached to any appendage.

x  

The horizontal distance from the forward point of LWP to the lowest point on the stem at a tangent of 450 to the horizontal, in the condition of Empty Weight.

y  

The vertical distance from the waterplane to the lowest point on the transom, in the condition of Empty Weight.