CLASS RULES - B -
THE MEASUREMENT RULES
Updated March 9, 2003
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.
No temporary or movable insert in the centreboard case is permitted.
5.6.2 A
thwart shall connect the top of the centreboard case to the inner faces of the
seat-tanks. It shall not be more than 153mm wide, may be curved or straight,
and its after edge shall lie between 1375mm and 2591mm from Station 11.
5.6.3 Additional
stiffening or reinforcing members may be fitted across the hull within 3581mm
of Station 11. These members shall not be constructed in such a manner as
to form a second cockpit floor or an additional buoyancy chamber.
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.
8.1 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