LIFTING FOILS
No. of Foils – The maximum number of foils that may be actively in use simultaneously.
With the boat upright in flotation trim, for each foil: Foil Span – The maximum transverse distance outside the hull shell between any two points on the foil in its fully extended position.
Foil Chord – The maximum longitudinal distance of the foil. The IRC Rating Authority reserves the right to require additional detail to be supplied and also to modify the above definitions on a case by case basis in accordance with IRC Rule 2.8.
RIG
BOW OVERHANGS BOW OVERHANGS BOW OVERHANGS
BO
P – The distance between the mainsail (in the case of a schooner, the foremast sail) upper limit mark, which shall be permanently marked by a 25mm band of contrasting colour, and the top of the boom when set at right angles to the mast, or the mainsail tack point whichever is lower, on the mainmast (in the case of a schooner, the foremast). If there is no band the measurement shall be taken to the top bearing surface of the halyard shackle. In the case of a gaff rig, the upper measurement point is the peak point of the mainsail or the head point of the topsail if on board.
x and h both 0 x and h both 0 x and h both 0
Waterplane Waterplane
TRADITIONAL BOW OR KNUCKLE IMMERSED
BOWaterplane BO
TRADITIONAL BOW OR KNUCKLE IMMERSED
TRADITIONAL BOW OR KNUCKLE IMMERSED
BOW OVERHANGS BOW OVERHANGS x and h both 0 h Waterplane BO
TRADITIONAL BOW OR KNUCKLE IMMERSED
HANGS x and h both 0 h Waterplane BO
W OR SED
x BO SCOW BOW OR KNUCKLE EXPOSED Waterplane
BO x
CLASSIC BOW 45° h
Fully retracted Fully down
SWING KEEL
Minimum draft
Fully retracted Fully down
Waterplane
Fully retracted Fully down
Minimum draft
DROP KEEL DROP KEEL DROP KEEL
DROP KEEL 45° 45° h h Waterplane O OR OSED ||||||||| | ||||||||| | ||||||||| | ||||||||| | ||||||||| | ||||||||| | ||||||||| | ||||||||| | ||||||||| | ||||||||| |
Fully retracted Fully down
Minimum draft
Fully retracted Fully down
Minimum draft
BO x
CLASSIC BOW Waterplane SWING KEEL
Fully retracted Fully down
Fully retracted Fully retracted Fully retracted
Minimum draft
Minimum draft
Minimum draft
CENTREBOARD
Minimum draft
Waterplane
Fully down Indicate on the application form
whether the keel is fixed down when racing whether the keel is fixed down when racing whether the keel is fixed down when racing
Fully down Indicate on the application form
Fully down Indicate on the application form
Maximum draft
Maximum draft
53
Maximum draft
Waterplane Waterplane
Waterplane
Maximum draft
Minimum draft
x
Fully retracted Fully down
SCOW BOW OR
Fully retracted Fully down
BO KNUCKLE EXPOSED
Fully retracted Fully down
Waterplane
Minimum draft
Minimum draft
CENTREBOARD CENTREBOARD
45°
Waterplane Waterplane
Waterplane
Maximum draft
Minimum draft
CENTREBOARD CENTREBOARD
Maximum draft
BO x
Maximum draft
Waterplane
Maximum draft
CLASSIC BOW 45°
Waterplane Waterplane
Waterplane h
PY – The distance between the mizzen (in the case of a schooner, the mainmast sail) upper limit mark which shall be permanently marked by a 25mm band of contrasting colour, and the top of the boom when set at right angles to the mast, or the mainsail tack whichever is lower, on the mizzenmast (in the case of a schooner, the mainmast). If there is no band the measurement shall be taken to the top bearing surface of the halyard shackle.
E – The outer point distance of a mainsail (or in the case of a schooner, a foremast sail). The outer limit mark shall be permanently marked by a 25mm band of contrasting colour. If there is no band the measurement shall be taken to the aft end of the boom. For the measurement of outer point distance, ERS H.4.2 shall not apply. Fittings, local curvature, local cutaway and any increase in the fore/aft dimension of a sail track and/or sail track support, shall be ignored.
45° 45°
h
KNUCKLE EXPOSED KNUCKLE EXPOSED KNUCKLE EXPOSED
SCOW BOW OR SCOW BOW OR SCOW BOW OR
xBO BO
x BO
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 by a 25mm band of contrasting colour. If there is no band the measurement shall be taken to the aft end of the boom.
h x
Waterplane h
Waterplane Waterplane
BO x
Waterplane Waterplane
Forestay – The ERS definition of forestay shall not apply. Forestay is defined as: permanently attached rigging providing forward support for a mast spar.
CLASSIC BOW CLASSIC BOW CLASSIC BOW
BO x
BO x
SWING KEEL SWING KEEL
SWING KEEL SWING KEEL
45° Waterplane 45°
45° 45°
h h h 45°
Maximum draft
Maximum draft
Waterplane
Maximum draft
Maximum draft
Waterplane
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