| 1. |
GENERAL |
| 1.1 |
Purpose of the Measurement Rules |
| 1.1.1 |
The One Metre is a Development
Class with One Design Rigs. |
| 1.1.2. |
The intention of these class rules
is to give freedom to develop the hull, keel rudder within these rules,
but to ensure that rigs are as alike as possible in respects affecting
performance. |
| 1.1.3 |
Anything in regard to the rig
not specifically permitted by these rule PROHIBITED |
| 1.1.4 |
Anything in regard to the hull,
keel and rudder not specifically restricted or prohibited is PERMITTED |
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| 1.6 |
Materials |
| 1.6.1 |
Except for remote control equipment,
material of higher density than lead (11.3 kg/dm3) is prohibited. |
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| 1.7 |
Weight and Draft |
| 1.7.1 |
When measured in sailing trim
and drained of water: |
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(a) The weight shall be 4.0 kg
minimum.
(b) The draft in fresh water shall be 370 mm minimum and
420 mm maximum.
(c) The depth of the hull, measured from the waterline
in fresh water to lowest point of the hull. shall not exceed 60 mm. |
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| 3 |
HULL |
| 3.1 |
Definitions |
| 3.1.1 |
The hull is defined as the boat
including all equipment but excluding the rig, the keel and the rudder. |
| 3.1.2 |
The structure of the hull is defined
as those items which contribute to the strength and watertight integrity
of the hull and includes; the hull shell, transom, keel trunking, mast
trunking, bulkheads, deck, deck beams, hatch coamings, hatch covers, similar
structural items, and their stiffening or reinforcement; and excludes plastic
or readily removable containers of remote control equipment. |
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| 3.2 |
Identification Marks |
| 3.2.1 |
The boat's national letters and
registration number shall be:
(a) Painted on, engraved in or moulded in an easily visible
location.
(b) Displayed on the external surface clearly and legibibly
with a minimum height of 20 mm |
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| 3.3 |
Materials |
| 3.3.1 |
Subject to 3.3.2 the structure
of the hull shall be made of and joined using one or more of the permitted
materials listed below:
(a) Metal with the exception of expanded, foamed and honeycombed
metal.
(b) Wood and wood based products containing no non-permitted
materials and with the exception of honeycombed material.
(c) Glass fibres.
(d) Gel coat, resin, adhesive, varnish, paint.
(e) Film covering materials which may be woven or partly
woven.
(f) Elastomeric material.
(g) Sheet plastic, which may be vacuum moulded, containing
no non-permitted materials, and with the exception of foam plastic. |
| 3.3.2 |
Resin used for bonding glass fibres
shall be un-pigmented and the interior shall be unpainted, except as in
3.2.1, to allow inspection of the fibres |
| 3.3.3 |
Unrestricted by 3.3.1, a builders
mark may be applied in accordance with the IYRR |
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| 3.4 |
Construction |
| 3.4.1 |
The hull shall be a monohull of maximum length
1,000 mm. |
| 3.4.2 |
The forward 10 mm of the hull shall be made
of elastomeric material. |
| 3.4.3 |
Except for hollows or voids formed by the
keel trunking and rudder tube:
(a) Hollows which exceed 3 mm or voids in the underwater
profile or the plan view of the hull are prohibited.
(b) Hollows in the undersurface of the hull, tested transversely
and parallel to the waterline, shall not exceed 3 mm.( see below) |
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| 4 |
KEEL AND
RUDDER |
| 4.1 |
Definitions |
| 4.1.1 |
The keel is defined as the fin,
the external ballast and any fastenings used to attach the external ballast
to the fin. |
| 4.1.2 |
The rudder is defined as the rudder and the
stock excluding steering attachments at the head of the stock |
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| 4.2 |
Construction |
| 4.2.1 |
One keel and one rudder only are
permitted |
| 4.2.2 |
The keel and/or rudder shall not have openings
through which water could pass |
| 4.2.3 |
The keel and rudder shall be removable
from the hull. |
| 4.2.4 |
Articulated keels and keels which can be
moved or rotated relative to the hull are prohibited |
| 4.2.5 |
The rudder shall be placed aft
of the keel and shall not project aft of the hull. Articulated rudders
are prohibited |
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| 4.3 |
Weights |
| 4.3.1 |
The weight of the keel shall be 2.2 kg minimum
and 2.5 kg maximum |
| 4.3.2 |
The weight of the rudder shall
not exceed 75 grams |
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| 5 |
RIG |
| 5.1 |
Definition |
| 5.1.1 |
A rig is defined as a mast, a
mast stub and/or joiners if used. a mainsail and its boom, a jib and its
boom, permitted fittings and rigging. |
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| 5.2 |
Materials |
| 5.2.1 |
MAST AND BOOMS
The principal material shall be alloy, with a minimum
of 90% aluminium content, or wood. The other permitted materials are: adhesive,
wax, varnish, paint or powder coat finish. Alloy may be anodised. |
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| 5.3 |
Masts |
| 5.3.1 |
Construction |
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(a) When in racing trim, measurements
shall comply with the measurement diagram.
(b) Masts may be stepped on or through the deck.
(c) A mast stub arrangement is permitted.
(d) Measurement bands shall be of a colour which contrasts
with the mast, may be of any material and shall be between 3 mm and 10
mm wide.
(e) Between the lower edge of the upper measurement band
and the upper edge of the lower measurement band:
(i) The mast cross section shall be round, 10.9 mm minimum
mean diameter, with constant external (and internal where hollow) section.
The section may contain an internal luff groove.
(ii) Internal and/or external joiners shall not exceed
100 mm in length. |
| 5.3.2 |
Fittings |
|
Each mast may have:
(a) Windvane or other indicator and/or its attachment.
(b) Backstay crane.
(c) Attachment for the jib stay and/or halyard.
(d) Attachments for the shrouds.
(e) Pair of spreaders and their attachments.
(f) Attachments for the mainsail luff, head and tack.
(g) Mast strut and/or its attachment.
(h) Cheekstays and/or their attachments.
(i) Gooseneck and/or its attachment.
(j) Kicking strap and/or its attachment.
(k) Mast deck fitting.
(1) Mast heel fitting.
(m) Rig corrector weight/s. |
| 5.3.3 |
Rigging |
|
Each mast shall be supported by:
(a) Jib stay and/or halyard.
(b) Pair of shrouds
(c) Backstay |
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| 5.4 |
Boom |
| 5.4.1 |
Construction |
|
a) Booms shall be of constant external (and
internal where hollow) cross section with the exception of the last 10mm
at each end. The maximum external cross section shall not exceed 20 mm.
b)The upper edge of the boom shall not have a permanent
set exceeding 3mm measured to a straight line between points 10mm from
each end of the boom. |
| 5.4.2 |
|
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Each boom may have:
a) Attachments for the mainsail tack, sheet, and clew.
b)Kicking strap and/or its attachment.
c) Counterweight and its attachment |
| 5.4.3 |
Jib Boom Fittings |
|
a) Attachments for a jib stay, tack, sheet,
clew and topping lift
b) Boom Swivel and/or its attachment.
c) Gooseneck and/or its attachment |
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| 5.5 |
Other Rigging Rules |
| 5.5.1 |
Unless otherwise specified, all
fittings and rigging may be adjustable. |
| 5.5.2 |
Masts and booms may be drilled for the purpose
of attaching fittings and rigging. |
| 5.5.3 |
If used, rig corrector weights
shall be below the lower mast measurement band |
| 5.5.4 |
Checkstays may be fitted only when the mast
is stepped on deck and no mast strut is fitted. They shall be attached
to the mast no more than 100mm above the deck. They shall act only in tension. |
| 5.5.5 |
The kicking strap shall act only
in tension from below the main boom. |
| 5.5.6 |
The tack point and/or the clew
point shall not extend more than 25mm beyond the end of a boom. |
| 5.5.7 |
The jib boom swivel shall be placed approximately
on the centreline of the hull. The alignment of the swivel shall be controlled
only by the rig tension. |
| 5.5.8 |
A line taken through the jib tack point and
head point shall not cut the forward face of the mast higher than the lower
edge of the middle measurement band when the jib is on the centreline of
the hull. |
| 5.5.9 |
A jib topping lift may be attached
to the jib stay and/or halyard, or their attachment to the mast. |
| 5.5.10 |
In order to prevent fouling of a topping
lift, a line may be attached to and /or passed around any of the following:
the topping lift; its attachments at either end; the jib; the jibstay. |
| 5.5.11 |
No part of a rig shall project
beyond the extreme ends of the hull. |
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| 6 |
SAILS |
| 6.1 |
General |
| 6.1.1 |
Sails shall be single ply soft
sails made and measured in accordance with the current 'IYRU Sail Measurement
Rules', except where varied herein. Where a term defined or a measurement
given in the IYRU Sail Measurement Rules is used in these rules it is printed
in 'italic'type. |
| 6.1.2 |
Sails shall comply with the measurements
on the measurement diagram. |
| 6.1.3 |
During measurement battens need
not be removed and sails may remain attached to spars |
| 6.1.4 |
The same cloth shall be used throughout the
body
of a sail |
| 6.1.5 |
With the exception of sail identification
marks, added paint, dyes or other decorations which stiffen the cloth shall
be regarded as reinforcement |
| 6.1.6 |
Seams, including their reinforcement,
and tablings shall not exceed 15 mm in width. |
| 6.1.7 |
Corner reinforcements shall
not exceed 125 mm measured from each corner measurement point |
| 6.1.8 |
Flutter patches are permitted but
shall fit within a square of 50 mm side. |
| 6.1.9 |
Discontinuous attachments on a
sail luff shall be disregarded for the purpose of measurement provided
that their total length, measured along the luff, does not exceed
10% of the length of the luff and that the longest attachment is no more
than twice the shortest. |
| 6.1.10 |
Telltales may be fitted to mainsail and/or
jib. |
| 6.1.11 |
Cringles and eyes not exceeding
10 mm in diameter may be used at attachment points. |
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| 6.2 |
Mainsails |
| 6.2.1 |
Each mainsail shall be made of a maximum
of four panels joined by seams which shall not be closer than 150
mm to a corner measurement point. |
| 6.2.2 |
With the exception of a double
luff any method of attachment to the mast is permitted. |
| 6.2.3 |
Where a mainsail is fitted with a bolt rope
or sliders which is/are held in a recess in the mast, the sail shall
be measured ignoring the rope or sliders |
| 6.2.4 |
The leech shall not be convex
between adjacent battens, between the clew point and the adjacent
batten or between the aft head pointand the adjacent batten. |
| 6.2.5 |
The foot shall not be convex between
the tack point and clew point |
| 6.2.6 |
There shall be three battens on the leech.
The distances from the centreline of a batten on the leech to the
adjacent leech pointshall not exceed 20 mm. |
| 6.2.7 |
The upper batten shall not exceed 1 0 x 75
mm and any pocket/reinforcements shall not exceed 25 x 95 mm. |
| 6.2.8 |
The two lower battens shall not exceed 1
0 x 1 00 mm and any pocket/reinforcements shall not exceed 25 x
120 mm. |
| 6.2.9 |
No part of a mainsail shall extend above
the lower edge of the upper measurement band or below the upper edge of
the lower measurement band. |
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| 6.3 |
Jibs |
| 6.3.1 |
Each jib shall be made of a maximum
of three panels joined by seams which shall not be closer than 100
mm to a corner measurement point. |
| 6.3.2 |
The luff tabling may envelope the
jib stay. |
| 6.3.3 |
The leech shall not extend
aft of a straight line from the clew point to the aft headpoint |
| 6.3.4 |
The foot shall not be convex between the
tack
pointand clew point |
| 6.3.5 |
There may be two battens. The
position of the battens, if fitted, shall comply with the measurement diagram. |
| 6.3.6 |
The battens, if used, shall not exceed 10
x 75 mm and any pockets/reinforcements shall not exceed 25x95mm. |
Introduction of new Class Rules for the One Metre, Marblehead and 10
Rater classes.
The minuted date (1.3.2001) for introduction of the new Class rules
for the above classes
has had to be deferred. There are number of reasons for this, but the
latest one is that we
need to fine tune our class rules in relation to the new (April lst
2001) version of ERS
(Equipment Rules of Sailing). In addition, we are having delays with
the diagrams in the
new rules and we have not yet started to format the new rules to go
on the website.
We shall however publish the new rules for each class on the website
at least one month
before they come into force.
The new One Metre rules will in any case not come into force until after
the WC in Croatia.
