CLASS
RULES - B - THE MEASUREMENT RULES
1.0 General
1.1
The 505 ('the boat” is a one-design dinghy of 5.05 metres L.O.A. designed
by John Westell and is an international dinghy class recognised by the International
Sailing Federation (“ISAF").
1.2
The administering authority is the International 505 Class Yacht Racing
Association ("the International Association") subject to its Constitution
and subject to the rules of the ISAF.
1.3
These Rules and the other documents of the Class are published in French
and English but, should there be a difference between them, the English version
shall prevail.
1.4
All boats shall be built, measured and registered in accordance with
these Rules. Should any conflict arise between the written Rules and the Measurement
Diagrams which form part of the Rules then the written Rules shall prevail.
1.5
Any boat having a Measurement Certificate or any sail bearing a Measurement
Stamp dated prior to the date of these Rules may be measured in accordance
with the Rules prevailing at the date when the boat or sail was first measured
unless these Rules state to the contrary or unless the boat or sail has been
altered, modified or renewed after the date of any relevant change to these
Rules. Any equipment which is altered, modified or renewed shall conform to
the current Rules.
1.6
Neither the designer nor the International Association nor the ISAF
nor any National Association accepts any legal responsibility in respect of
those Rules or the designer's drawings or any claims arising from them.
2.0 Fees
2.1
Upon the application for a sail number and registration of a new boat
the following fees shall be payable
2.1.1
The designer's royalty which is such sum as the International Association
shall decide from time to time upon recommendations of the IEC not being less
than ten pounds sterling.
2.1.2 The registration fee which is such sum as
the International Association shall decide from time to time upon the recommendation
of the IEC.
3.0 Registration
3.1
Sail numbers are issued by the International Secretary upon receipt
of payment of the designer's royalty and the registration fee.
3.2
An owner or his agent wishing to register a boat shall apply to the
International Secretary for the issue of a sail number and a Measurement Form.
The application shall be accompanied by payment of the designer's royalty
and registration fee.
3.3
The registration of a boat as an International 505 Dinghy is completed
upon satisfactory completion and return of the Measurement Form (through a
National Association) and the issue of a Measurement Certificate by the International
Secretary
3.4
No boat may race unless it has a valid Measurement Certificate and
its owner and helmsman are members of the International Association.
4.0 Measurement
4.1
Boats and their equipment shall be measured only by measurers appointed
by the IEC in consultation with the International Rules Committee ("IRC")
or appointed by a National Association or appointed by a National Yachting
Authority.
4.2
No owner may measure his own boat, sails or equipment, nor may a builder
or sailmaker measure his own products.
4.3
Measurement shall be carried out using only the Documents supplied
by the International Association, namely these Rules and the Measurement Form
(including Instructions to Measurers) and the Official Templates.
4.4
In addition to the particulars required by the Measurement Form, the
Measurer shall report on the Form anything which he considers to be a departure
from the intended nature and design of the boat or to be against the general
interest of the Class. In these circumstances the Measurement shall be sent
to the IEC through the International Secretary. The IEC shall refer the matter
to the IRC to decide whether or not a Measurement Certificate should be granted.
The IRC is empowered to grant dispensation in exceptional cases. Such dispensation
shall be recorded on the Measurement Form and the Measurement Certificate.
4.5
It shall be the owner's responsibility to ensure that the boat complies
with these Rules at all times.
4.6
Re-measurement may be ordered by the International Association, the
IRC or a National Association at any time.
4.7
New spars and sails shall be measured before use. Sails shall be signed
and dated and where possible stamped by the measurer
5.0
The Hull
5.1
Materials and methods of construction are not restricted except as
provided by these Rules. The designer’s drawings show a method of constructing
in moulded plywood.
5.2
Hull Shape
5.2.1
The hull shape shall conform to the designer's drawings and the offsets
annexed within the tolerances specified by the Measurement Diagrams and these
Rules.
5.2.2
Hull moulds shall be checked by reference to plugs, moulds and production
hulls before general use and after any modifications. Any builder constructing
a new mould shall inform the International Office that it conforms to these
Rules. The International Association may check moulds at any time.
5.2.3
Station 11 is defined as the plane at right angles to the base tine
shown in the measurement diagram and passing through the aftermost point of
the hull, excluding rudder fittings. The after measurement point of the hull
is the point on the centreline of the boat where the outer surface of the
keel band would, if projected intersect Station 11, neglecting any actual
rounding of the keel band. Other measurement stations are planes parallel
to Station 11 at the specified distance from it.
5.2.4
No part of the after edge of the hull shall be more than 7.5mm from
Station 11. No part of the after end of the seat-tank shall be more than 20mm
forward of the after edge of the hull. The design of the transom is free in
other respects.
5.3
Keel Band
5.3.1
Along the centreline from stem to transom a fl at keel-band shall project
not less than 3mm and not more than 4.5mm from the surface of the hull and
may be rounded to a radius of not more than 3mm. However at the sides of the
centreboard slot the section may be ‘half-round’ instead of flat.
Keel band widths shall be within the following limits:
Max (mm) Min (mm)
Transom 75 30
Station
9 75 65
Station
6 75 65
Station
3 35 25
Forward of Station 3 the keel band may
be faired into the hull.
5.4
Foredeck
5.4.1The after edge of the foredeck (which
need not be straight between the centreline and the gunwale) shall lie within
the tolerances set out in the Measurement Diagram. The after edge of the foredeck
at any point along its length shall be at or above the "top of gunwale”.
The “top of gunwale" is defined as being a point 20mm inside the
extreme edge of the hull regardless of construction.
5.4.2
Forward of the most forward position of the after edge of the foredeck
the only apertures permitted are:
*
Spinnaker chute
*
A combined area of not
more than 5000 mm2 for rigging and controls
*
One or two areas not exceeding 120,000 mm2 each, no part
of which shall be further than 3486mm from Station 11, or within l00mm of
the centreline, or within 250mm of the top of gunwale'
5.5 Forward Watertight Compartments and Seat-Tanks
5.5-1
The forward compartment and the seat-tanks shall be separate watertight
compartments.
5.5.2
The watertight bulkhead and seat-tanks shall conform to the drawings
within the tolerances specified in the Measurement Diagram.
5.5.3
The forward compartment may include one spinnaker chute only, the volume
of which shall not exceed 20% of the total volume of the forward compartment.
The construction of the spinnaker chute shall not impair the watertight integrity
of the forward compartment.
5.5.4
The watertight diagonal bulkheads at the forward ends of the seat-tanks
shall lie at or forward of the after edge of the foredeck.
5.6
Centreboard Case and Thwarts
5.6.1
The internal dimensions of the centreboard case shall conform to the
tolerances specified in the Measurement Diagram.
5.6.2
Athwart shall connect the top of the centreboard case to the inner
faces of the seat-tanks. It shall not be more than 153mm wide and its after
edge shall lie between 1375mm and 2591mm from Station 11.
5.6.3
Additional thwarts, bridge-decks and sheet horses may be fitted across
the hull. The total width of all such additional thwarts etc. shall not exceed
l5Omm.
5.7 Not in use
5.8
Weight
5.8.1
Boats
shall be weighed in dry conditions for measurement and certification after
an uninterrupted period of two weeks not having touched water.
5.8.2
The
sailing weight in dry condition shall not be less than 127.4kg. The sailing
weight is the weight of the hull including metal corrector weights, the spars,
standing and running rigging, centreboard, rudder and tiller, but excluding
the sails and battens. Fittings and components of exaggerated weight and artificially
heavy areas construction are not permitted: examples include use of lead or
other heavy metals, except for corrector weights permitted under Rule B-5.8.3.
5.8.3
If
the sailing weight is less than 127.4kg, the difference, without limit, shall
be made up by metal corrector weights fixed against the centreboard case or
spine and visible when viewed from a standing position next to the boat, half
between 1100mm and 1500mm and half between 2900mm and 3500mm from Station
11, such ballast to be retained for the life of the boat or until the boat
is reweighed in accordance with Rule B - 5.8.5.
5.8.4
Each
metal corrector weight shall be hard stamped in a visible place with its weight
in kilograms to the nearest 0.1 kilograms and a serial number to identify
the piece of ballast and the total number of pieces used in the boat
5.8.5
Boats
may be reweighed at any time by a Class Measurer providing that immediately
prior to reweighing, the boat has not touched water for a period of at least
two weeks, The sailing weight and the number and weight of ballast pieces
shall be recorded on the certificate by the Measurer. The metal ballast referred
to in Rule B - 5.8.3 may only be removed or reduced at a reweighing commissioned
by the owner under this paragraph and such reweighings may only take place
at intervals greater than 12 months.
5.9
Sail Number
5.9.1
The sail number of the boat shall be clearly carved or impressed on
the transom, spine, or aft end of the centreboard case in numbers of l5mm
minimum height.
5.9.2
The ISAF levy plaque bearing the registered sail number shall be fixed
on the transom, spine or aft end of the centreboard case.
6.0 Centreboard, Rudder and Tiller
6.1
One rudder and one centreboard only may be used at anyone time. At
all times when sailing, both sides of the centreboard and rudder shall have
similar profiles. Leeboards, daggerboards, hydrofoils, trim tabs, fences and
similar devices are prohibited.
6.2
The centreboard shall fit within the centreboard case not extending
below the bottom of the hull when fully raised. The trailing edge may project
above the centreboard case top when in the raised or partly raised position.
No part of the leading edge which is more than 300mm from the tip and is capable
of protruding below the hull shall be capable of being raised more than 200mm
above the bottom of the hull.
6.3
The rudder shall be hung at the transom and no part of the rudder assembly
shall pass through the skin of the hull. The
tiller may be shipped through a port in the transom or over the top.
7.0 Spars
7.1
General
7.1.1
The object of these Rules is to maintain the sail plan of the Class
to substantially the same design, whilst giving owners freedom to arrange
the rigging as they wish.
7.1.2
A boat may not have facilities for setting more than one mainsail,
one headsail and one spinnaker. No changes of sail are permitted during a
race.
7.1.3
Except for fittings, spars shall be constructed solely either from
aluminum alloy containing not less than 90% by weight of aluminium or from
wood. Construction is otherwise unrestricted.
7.2
Mast
7.2.1
The mast maybe stepped on the deck or into the hull. With the mast
perpendicular to the base line, the after side at deck level shall not be
less than 3048mm and not more than 3202mm forward of Station 11. The mast
may be fixed or rotating. Excluding fittings, no dimension at right angles
to the length may exceed l02mm.
7.2.2
When standing free with no sail set, the after edge of the mast from
the top to a point 1000mm above the deck shall be straight. The leading edge
shall be a straight line or a fair continuous convex curve. Permanently bent
masts are prohibited. A set, due to distortion, of up to 30mm between bands
identified at B-7.2.3.2 and B-7.2.3.3 shall be permitted.
7.2.3
Bands of contrasting colour not less than l0mm wide shall be placed
round the mast at the following three positions measured with the mast standing
perpendicular to the baseline.
1. upper edge level with the top of the deck.
- Tolerance +/-I
mm (deck band)
2. upper edge 381mm above the deck band.
- Minimum dimension
3. lower edge 6858mm above the deck band.
- Maximum dimension
Extreme height of any spar - 7011mm above the deck band -Maximum dimension
7.2.4
The distance from the upper edge of the deck band to the lower edge
of the spinnaker halyard, when at 90° to the mast and extended as necessary,
shall be not more than 5955 mm nor less than 5054 mm. No rigidly fixed point
for attachment of the block, sheave or fairlead shall be more than 35 mm from
the surface of the mast.
7.2.5
The highest point of entry onto the block, sheave or fairlead for the
headsail halyard shall not be more than 4750mm and not less than 4648mm above
deck band. A prolongation of the luff of the headsail when set shall cut the
fore-side of the mast between these limits.
7.2.6
These measurements apply to masts whether fitted with mastjacks or
otherwise. At all times when sailing, an extension of the upper surface of
the deck shall intersect the mast at the upper edge of the deck band.
7.3
Boom
7.3.1
The upper edge of the boom shall be straight when no sail is set. With
the exception of fittings, no dimension of he boom measured at right angles
to its length may exceed 102 mm. A set, due to distortion, of up to 25mm over
the length of the boom shall be permitted.
7.3.2
With the boom attached to the mast in the normal way and lying fore
and aft at right angles to the mast, the point where a prolongation of the
line down the after-edge of the mast cuts the op of the boom shall be found,
the "Intersection Point". A band of contrasting colour not less
than 10mm wide shall be placed round the boom with its inner edge not more
than 2858mm from the Intersection Point.
7.3.3
The overall length of boom from the Intersection Point (B-7.3.2) to
outer end of boom shall not exceed 3308mm.
7.3.4
A prolongation of the top of the boom shall cut the mast at or above
the band identified at B-7.2.3.2.
7.4
Spinnaker Pole
7.4.1
The overall length of the spinnaker pole shall not exceed 2516mrm including
pole fittings. When in use it shall be attached to a mast fitting protruding
not more than 50mm from the surface of the mast.
8.0 Sails
8.1
General
8.1.1
Sails shall be made and measured in accordance with the ISAF Equipment Rules of Sailing and comply with their requirements. In
the event of conflict with these Class Rules, the Class Rules shall prevail.
8.1.2
Sails need not be made from woven fibre cloth material but shall otherwise
comply with the requirements of the ISAF as to materials.
8.1.3
Stretching after measurement resulting in the maximum dimensions being
exceeded is not permitted and continued conformity with Class Rules is the
responsibility of the owner
8.1.4
No sail shall have a hole or aperture other than the normal reefing
and attachment points.
8.1.5
Sail reinforcement is not restricted.
8.2
Mainsail
8.2.1
The mainsail shall conform with the Class Rules and the measurement
diagrams, except that a sail smaller in any dimension is allowed. No part
of this sail shall be set above the lower edge of the band on the mast identified
at B-7.2.3.3.
8.2.2
The luff and the foot shall be secured to the mast and boom respectively
over at least 80 per cent of their lengths.
8.2.3
The following dimensions, including boltropes where fitted, shall not
be exceeded:
·
Top
width
127mm
·
Width
at upper leech point 325mm from head point
270mm
·
Three-quarter
width
1120mm
·
Half
width
1950mm
·
Leech
length
6960mm
8.2.4
The mainsail shall have not more than four battens in the leech. At the leech, the centre of the top batten pocket
shall be between 1450mm and 1550mm from the head point, and the centre of
the bottom batten pocket shall be between 1250mm and 1490mm from the clew
point. No batten pocket shall be located less than 1000mm from any other batten
pocket. No batten or pocket shall exceed 1180mm in length
8.2.5
The Class insignia to be displayed on the mainsail shall be in accordance
with the shape and tolerances shown in the Measurement Diagram.
8.3 Headsail
8.3.1
The headsail shall conform to the official rules and diagrams, except
that a sail smaller in any dimension except batten position is allowed.
8.3.2
The leech shall not extend beyond a straight line from the aft head
point to the clew point.
8.3.3 The following
dimensions shall not be exceeded:
·
Luff
length
4510mm
·
Foot
length
2287mm
·
Leech
length
4000mm
·
Top
width
40mm
8.3.4
Not more than three battens may be used in the leech of any headsail. The outer ends of the battens shall be located
within 102mm of marks dividing the leech into four (if three battens) or the
appropriate number of equal parts. Not more than one batten, part of which
shall be within 50mm of the centre, is permitted in the foot. No batten or
batten pocket may exceed 305mm in length and 51mm in width.
8.3.5 No
part of the foot shall lie outside a measurement taken in the following way:
·
Lay
out the headsail on a flat surface.
·
Fold
the tack onto the clew and smooth the headsail to find the "intersection
point" where the luff is intersected by the fold from the centre of the
foot.
·
The
measurement is the distance taken from the "intersection point"
to the tack and the clew. No part of the foot shall lie at a greater radius
from the "intersection point" with all wrinkles removed from the
sail on the line of measurement.
8.3.6
Sleeve luffs may be made to enclose the forestay but the width of such
a sleeve shall not exceed 76mm.
8.3.7
An extension of the headsail luff when set shall cut the centreline
of the deck between the stemhead and a point 400mm abaft the stemhead.
8.3.8
There shall be a transparent panel in the lower part of the headsail
of a minimum size of 0.15m2 to ensure visibility to leeward for
the crew.
8.4 Spinnaker
8.4.1
The spinnaker shall be a symmetrical three-cornered sail in accordance
with the Class Rules and Measurements Diagrams except that a sail smaller
in any dimension is allowed.
8.4.2
The following dimensions shall not be exceeded:
·
Leech
length
6000mm
·
Foot
median (head point to mid foot point)
7096mm
·
Foot
length
4500mm
·
Half
width
4500mm
8.4.3
The ISAF Racing Rules of Sailing (“IRS”) Appendix H paragraph 1.3(d)
is replaced by the following Class Rule in accordance with Appendix H5 of
the IRS:
"The number shall be displayed symmetrically
on the front side of the spinnaker. It shall be displayed wholly below an arc whose
center is the head point and whose radius is 40% the mean length of the two
leaches and wholly above an arc whose radius is 60% of that dimension."
9.0 Materials
9.1
Except where prescribed by these rules, either directly or by inference,
there are no restrictions on the use of any materials in construction.
9.2
The use of particular materials may be prohibited or limited:
9.2.1
On the proposal of at least two National Associations and passed by
a two-thirds majority of those attending the international Annual General
Meeting and entitled to vote on changes on these rules as prescribed by the
International Constitution.
and
9.2.2
If such proposal is approved by the International Rules Committee and
the ISAF.
9.3
Such prohibition or limitation will continue either
9.3.1
for such period from the 1st January next following as maybe prescribed
being not less than 1 year nor more than 3 years when it shall lapse unless
renewed by the procedure in Rule B-9.21
or
9.3.2 until a permanent
change is made to these Rules in accordance with the International Constitution
either to incorporate such a prohibition or limitation or to make another
provision which is inconsistent with it.
9.4
The prohibition or limitation may be expressed to apply to all spars,
sails, fittings and equipment belonging to a boat when the prohibition or
limitation comes into force. Such prohibition or limitation shall not apply
to hulls completed before it comes into force.
10.0 Buoyancy
10.1 Owing
to the large amount of tank space, it is not practicable to test each boat
by complete Immersion of the watertight compartments. The measurer shall inspect
the compartments carefully and satisfy himself that they are tight.
10.2 The
owner shall maintain the integrity of the watertight compartments in an efficient
condition and the Measurement Certificate will automatically become invalid
should he fail to do so.
11.0 Equipment
11.1 Devices
which indicate remotely or transmit or correlate data about wind direction,
wind speed, boat speed or location shall be prohibited.
11.2 No
anchor and chain or rope is required.
12.0 Crew and Weight of Clothing and Equipment
12.1 The
crew shall consist of two people.
12.2 Only
one person may be suspended outboard from spars or rigging. No device attached
to the hull and projecting outboard beyond the line of the gunwale may be
used.
12.3 (IRS
43.1) A competitor’s clothing and equipment shall not weigh more than 10 kilograms,
excluding a hiking or trapeze harness and clothing (including footwear) worn
only below the knee. In all other respects, the provisions of RRS 43 shall
apply.
13.0 Propulsion
13.1 In
accordance with RRS 86.1(c), RRS 42.3(b) is not applicable and the following
Class Rule is substituted:
"Except on a beat to windward, when
surfing (rapidly accelerating down the leeward side of a wave) or planing
is possible, the boat’s crew may pull the sheet and guy controlling any sail
in order to accelerate a boat down the face of the wave or in response to
a gust of wind, but not more than three repeated pulls and releases of the
sail may be made for each wave or gust of wind."
14.0 Advertising
14.1 The
advertising category to be applied to the International 505 Class shall be
Category C. The Association has decided
not to restrict advertising within Category C (Regulation 20.4.5).
15.0 Temporary Rules
Revised
01.01.2002