EUROPEAN & MEDITERRANEANCLASS RULES 1998
1.1 The IMX 38 is a one-design
class. The intention of these rules is to ensure that all
boats are as alike as possible in hull shapes, appendages,
weight, weight distribution, rig and sail plan. The construction
of the hull, spars, sails and rigging are controlled by
these rules except where variations are specifically permitted.
1.2 The word "shall"
is mandatory and the word "may" or "can"
1.3 Wherever in these rules
the words "Class Rules" or "Standard Build"
are used they shall be taken as included in the official
drawings and diagrams as produced by X-Yachts and shall
mean as fitted by the builder.
1.4 In general it should be
considered that any alteration to the Standard Build is
not permitted unless specifically permitted by these rules.
2.0 MEASUREMENT AND
2.1 Except where other methods
of measurement are specifically indicated, all measurements
shall be carried out in accordance with the ISAF measurement
2.2 In the case of a measurement
dispute on hull, spars, sails, fittings, equipment to be
carried, keel, rudder or rigging, the matter shall be referred
to the Class Technical Committee for a written ruling.
2.3 No yacht shall take part
in a Class event unless it conforms to the Class Rules
and its owner is a member of a National Association.
2.4 It is the responsibility
of the owner to see that his yacht, spars, sails and equipment
comply with the Class Rules and the relevant International
Yacht Racing Rules at all times and the alterations, replacements
or repairs to the yacht, spars, sails comply to the Class
3.1 The hull, deck, interior
layout, keel, rudder, rig and sails shall conform to the
Building Specifications, Class Rules and Official Plans.
The sheerline and profile shall be as shown on the Lines
Plan and all dimensions that affect the hull shape shall
be as defined in the IMS International Hull Standard "ORC
3.2 The hull, deck and interior
shall be moulded in reinforced plastics to the builders
lamination specification in moulds provided by X-Yachts.
3.3 The Datum Weight of the
yacht shall be a minimum of 5,370 kg., with only the following
equipment: mast, boom, kicking strap, standing and running
rigging, floorboards, washboards, blocks, spinnaker pole,
aft pipecots, standard table, toilet, batteries and cushions.
This means that ie following
equipment not shall be included in the weight: Anchors,
warps and chain, tools, portable deck equipment, spareparts,
safety equipment, charts and navgational equipment, galley
equipment and food, ect.
The Datum Weight of the yacht
can be found by deducting the above-mentioned equipment
which will be mentioned on the "Rating Certificate
page 2" from the "DSPM - measurement trim"
on the IMS certificate. The IMS certificate shall use the
IMS international hull standard "ORC0010.B0F".
If it is necessary to add
ballast to a yacht to meet the rules of the min. displacement,
this ballast (which shall be lead) shall be split up into
2 equal parts. Each part shall be secured on the underside
of the shelf right aft of the chainplate bulkhead in main
cabin. One part at starboard side and one part at port side.
This ballast shall not be thicker than 10 cm measured vertically
from the underside of the shelf.
3.4 The shape of the hull
shall be in accordance with the Lines Plan 1 and Table of
Offsets, and be within tolerances specified.
The hull number shall be inscribed
on a metal plaque fixed to the aft part of
3.6 Any repairs to the hull
and deck shall return the affected area to the standard
3.7 The deck shall be fitted
with 4 stainless steel stanchions each side, as defined
in Plan 4. Upper lifelines of wire not less than 5 mm shall
be attached to the pulpit and pushpit and pass through the
stanchions and between both aft pushpits. The height of
the upper lifelines above the sheerline when measured vertically
shall not be less than 600 mm. A second set of parallel
lifelines of wire not less than 4 mm shall be fitted approximately
300 mm above the sheerline. When lifelines are secured by
lanyards, the lanyard shall be of synthetic rope with an
exposed length of not more than 100 mm. The maximum deflection
of all lifelines shall not exceed 150 mm when a 5 kg weight
is suspended at any point between the stanchions. The stanchions
shall not extend outboard of the sheer in plan by more than
The following are not permitted:
(a) Coring, drilling out,
rebuilding, replacement of materials, grinding or relocating
standard equipment in any way to reduce weight, to improve
moments of inertia or to change standard shapes.
(b) Re-shaping of the hull
contours or profiles.
4.1 The keel shall be of moulded
iron and lead to the building specifications and cast in
a mould licensed by X-Yachts.
4.2 The external dimensions
and configuration of the keel shall comply with the Official
Plan. The iron and lead parts of the keel shall be covered
with GRP all over. The keel may be overcoated with any protective
material and faired, provided it complies with the dimensions
in Official Plan 6.
4.3 The keel shall be bolted
in position as shown on the Plan 1 and 6. All bolts, washers
and nuts indicated at plan 6 shall be fitted.
4.4 The weight of the keel
casting shall be 1,900 kg, +/- 25 kg. This keel weight shall
be recorded by the Builder and shall be listed in the "Builders
certificate" when issued
5.1 The rudder blade shall
be of GRP and made from moulds licensed by X-Yachts and
supplied by the Builder. Minimum weight of rudder and rudder
stock shall be 35 kg. The use of rudder flaps is prohibited.
A weed deflector is permitted.
5.2 The external dimensions
and configuration of the rudder shall comply with the Official
Rudder Drawing and table of offsets contained in Official
Plan 7. The rudder may be overcoated in any base liquid
or paste protective material, provided it complies with
the minimum dimensions in Plan 7.
5.3 It is prohibited to alter
or remove the S-drive. The rubber cover fitted to early
models may be removed. Modification drawings available.
5.4 The gap between the top
of the rudder and the hull may be filled.
6.1 The mast and main boom
shall be of aluminium alloy extrusion with integral luff
track to accept luff slides or bolt rope. The mast and boom
shall conform to the spar specification and be supplied
by the Builder. Replacement mast and/or boom may only be
supplied by the Builder or the Licensed Spar Manufacturer.
No alterations or modifications to the spars extrusion are
permitted except to facilitate the attachment of rigging
and fittings as specified in these rules. The licensed spar
manufacturer must be approved by X-Yachts and the Association.
Mast sectional dimensions
L x B shall be min. 198 x 108 mm and max. 204 x 119 mm
Moment of Inertia: IX Iy
min. 1200 cm4 min. 360 cm4
max 1320 cm4 max 380 cm4
Min. weight/m: 6.4 kg Max. weight/m: 6.9 kg
The mast may be tapered at
top. Max length of tapering from mast top 2,250 mm.
Min. sectional dimensions of tapering 150 x 108 mm.
6.3 The mast shall be fixed
at the heel as per drawing 2 and 4 and chocked at deck level
in way of the mast and shall not be altered whilst racing.
6.4 Bands of contrasting colour
of a minimum width of 15 mm shall encircle the mast. The
distance from the upper edge of the lower band (at standard
boom height) to the lower edge of the upper band shall not
be more than 13,350 mm. Movement of the bands or a failure
to display them whilst racing is prohibited. The mainsail
shall be set between these bands at all times when racing.
6.5 The distance to the upper
edge of the boom P band from the lower edge of mast base
shall be no more than 3,237 mm +/- 10 mm and between 1,830
mm and 1,870 mm above the sheerline.
6.6 No alterations to the
mast are permitted, except for the sole purpose of fitting
navigation lights, wind vanes and pre feeders. No alterations
to halyard exists are permitted nor any alterations which
might change the moment of inertia of the spar.
It is permitted to demount
the steaming light on the mast. Instead a portable steaming
light that can be ready for use immediately must be aboard.
It is a must that it can be fixed on the mast over the spinnaker
pole track, just as it is a must that its wires can be connected
to a 12 V socket on the electrical panel below the cockpit.
6.7 Spreaders shall be standard
supplied by licensed mast builder and shall conform to the
Length from mast centre Placing
above lower band
Upper 620 mm +/- 10 mm 10,370 +/- 30 mm
Middle 1,060 mm +/- 10 mm 6,730 +/- 30 mm
Lower 1,210 mm +/- 10 mm 3,133 +/- 30 mm
Distance from mast aft edge
to centre of rod at spreaders measured at mast centre line
according to plan 1:
Upper 7 mm +/- 10 mm
Middle 85 mm +/- 13 mm
Lower 112 mm +/- 15 mm
6.8 Spreaders shall be raked
aft in accordance with official drawings Plan 2. (Spreaders
shall be placed so that a vertical plan through the centre
line of the spreaders will pass through the centre of the
tipcup at the side deck +/- 5 mm.)
7.1 The boom shall be supplied
by the Builder.
The minimum weight of the
boom shall be 25 kg. incl. one reefline, outhaul, gooseneck
tackle, webbing for mainsheet block and fitting for boom
The sectional dimensions of
the boom shall be:
Height 188 mm +/- 5 mm
Breadth 104 mm +/- 5 mm
Weight/m 5.2 kg +/- 0.3 kg
7.2 A band of contrasting
colour shall be painted on the boom with its forward edge
not more than 4,900 mm from the after edge of the mast extrusion.
The mainsail foot shall be set forward of this band at all
times when racing.
7.3 The main boom shall be
equipped for double slab reefing and outhaul. No other method
of reefing is permitted. A flattening reef and provision
for a third reef may be fitted.
7.4 A boom vang shall be fitted.
This must support the boom and weigh no less than 4 kg.
8.0 SPINNAKER POLE
8.1 The overall length of
the spinnaker pole including fittings (SPL) shall be not
more than 4,400 mm.
8.2 The spinnaker pole shall
be aluminium or carbon. Reaching struts are prohibited.
One spare spinnaker pole is permitted.
9.0 MAST RIGGING
9.1 Standing Rigging
All standing rigging shall
be of rod - for specification see point 9.4 with sizes and
lengths as defined in the Sail Plan.
9.2 The forestay shall be
attached to the masthead with a ball terminal as original
Hight to lower side of the ball above lower P-band is 13.685
mm +/-20 mm
9.3 The forestay and shrouds
shall not be adjusted whilst racing.
9.4 The rigging rods shall
be the following size:
Forestay 8.5 mm
V1 8.5 mm
V2 7.5 mm
V3 and D4 7.0 mm
D1 7.5 mm
D2 6.0 mm
D3 5.0 mm
Permanent backstay 7.0 mm
9.5 The riggings shall be
fixed as per drawing 2.
9.6 Load cells are permitted.
9.7 Runners shall be situated
according to Plan 1 and shall be adjustable on roof. Runners
may be fine adjusted by block and tackle system mounted
above or below deck. Runner winches are not allowed.
9.8 Running backstay chainplate
shall not be moved from position as shown in plan 4.
10.0 RUNNING RIGGING
10.1 The mast shall be equipped
with the following:
1 main halyard
1 genoa halyard
2 spinnaker halyards
A pole topping lift is permitted.
A drawing is available if required.
10.2 The size and material
of halyards to owner's choice.
10.3 Titanium or aluminium
snap shackles are prohibited and therefore shall be stainless
steel or bronze.
11.1 All sails to be measured
in accordance with ISAF instructions, except as specifically
changed by these rules. Patches and reinforcements are free.
11.2 The materials which are
currently allowed in the IOR and IMS racing division shall
be permitted. Any material which does not comply with these
rules is forbidden.
11.3 National letters and
numbers on sails shall be carried in accordance with IYRR
25 and appendix B3, except that letters and numbers shall
be carried on every spinnaker and also every jib with an
LP or more than 130% of the base of the fore triangle.
11.4 The class insignia shall
be placed on both sides of the mainsail, as shown in plan
8. The colours shall be black and blue as per drawing 8.
The min. weight of the mainsail
without battens is 14 kg. Correctors, if necessary, shall
be fastened to the top spreader.
The sail shall be fitted with
a minimum of one reef with a minimum height of 1700 mm over
the foot in the luff and leech.
The sail shall have 4 battens
evenly distributed along the leech. The sail shall not be
Maximum leech length: 14.300
mm Top batten may be full length. The other three battens
to be maximum length of 1.660 mm. Headboard not to exceed
160 mm. No carbon in battens.
For 1998 it has been desided
to allow two different mainsails - one to be used in Mediterranean
area - and keeping the original Class mainsail size for
the Atlantic and North European area.
IMX 38 European Championship
1998 will be allow "Mediterranean Size Mainsail"
Mediterranean CLASS NORTH
Max MGT: 1,030 mm 940 mm
Max MGU: 1,860 mm 1,750 mm
Max MGM: 3,180 mm 3,080 mm
Max MGL: 4,170 mm 4,090 mm
Leech lines, cunningham, flattening
reef, camber stripes, as well as a second and third reef
The mainsail shall not be
extended beyond the black measurement bands of the mast
and boom whilst racing.
11.6.1 Not more than three
large headsails with LPG (dired comparision with sail stamps
(luff perpendicular) between 5.900 mm and 6.600 mm.
11.6.2 Genoa III:
The LP shall not be more than 4,850 mm
Genoa III may be provided
with a maximum of 4 battens of the following dimensions:
BL 1: full batten
BL 2: 950 mm
BL 3: 1,100 mm
BL 4: 1,350 mm
All large and small jibs may
be provided with a maximum of two windows with a combined
maximum area of 0.3 m2.
11.6.3 Genoa IV/heavy weather
(as per ORC Special Regulations, para 10.21.3)
max. area 32 m2
The LP shall not be more than
Genoa IV may be provided with
a maximum of 3 battens of the following dimensions:
BL 1: full batten
BL 2: 1,000 mm
BL 3: 1,250 mm
11.6.4 Storm Jib: Max area
(as per ORC Special Regulations)
The LP shall not be more than
No windows, battens or reefs are allowed.
3 Spinnakers are allowed.
All to be three cornered sails symmetrical along the centre
line from the head to the middle of the foot.
The length of the leeches,
SL shall not be more than 15,400 mm
The max width SMW of spinnaker
shall not be more than 7,920 mm
The foot of the spinnaker
SF shall not be more than 7,920 mm
11.8 Only the following maximum
number of sails may be used at an IMX event:
one mainsail (as per para
three large headsails (as per para 11.6.1 above)
one No 3 genoa (as per para 11.6.2 above)
one No 4 genoa (as per para 11.6.3 above)
one stormjib (as per para 11.6.4 above)
one storm trysail (as per ORC regulations)
three spinnakers (as per para 11.7 above)
All sails stamped-in shall
be carried on board at all times whilst racing in an IMX-38
one design event.
Substantial repairs or replacements
can only be made after permission from the Protest Committee.
12.0 MINIMUM SAFETY
Lifelines as per Rule 3.7.
In addition all safety equipment in accordance to ORC Special
Regulations Category 4, or as defined in the sailing instructions.
13.0 CREW LIMITS
The crew weight shall be a
maximum of 810 kg.
Crew numbers: a maximum of 10 people.
Unless otherwise stated all
IMX 38s must be fitted out as "standard build"
and removal of any standard interior wood or fitting is
prohibited. The table shall not be removed for racing. As
a minimum all IMX 38s shall be equipped with the following
standard equipment and placed as shown in Drawing 3.
Tanks shall be placed in main
cabin under the berths (see Drawing 3). All standard fit
cushions must remain on board whilst racing and shall not
be moved with the exception of the two forward cabin cushions
and pipeberths which may be removed for racing.
14.1 Stainless steel sink
in galley, sink in toilet. 100 litre water tank with electrically
operated pump at galley and toilet. Fixed plumbed in toilet
in front of main bulkhead with 1 through hull outlet of
1 3" and 1 through hull inlet 2". Through hull
outlets for galley and toilet sinks 2 of each 2". Sea
valves shall not be closed to flush fit hull, use of filler,
tape or the like to reduce water resistance is prohibited.
In exceptional circumstances
and where local law requires (i.e., Swiss and German lakes)
chemical toilets, and skin fittings to be shut off or are
banned, dispensation may be granted by the Technical Committee
as far as Rule 14.1 is concerned.
14.2 The three batteries shall
be placed just in front of the engine as per Drawing 3.
14.4 Main cabin as standard
delivered. Engine box and ladder must be standard build.
14.5 Aft 2 pipe cots minimum
with cushions and two quarter berths. Extra berths allowed.
14.6 The inside topsides shall
be covered with canvas pockets.
Minimum 3 batteries each 12
volt minimum (70 a/h minimum) total minimum 45 kg maximum
60 kg. Charger if any on main engine with fuse panel fitted
at chart table. 8 internal light fittings shall not be removed.
No restriction on instruments subject to Racing Instructions.
Minimum deck equipment as
shown in Drawing 4. Genoa and mainsheet track must be positioned
as shown in Drawing 4. Genoas shall only be sheeted outboard
via a barberhaul to the standard pad eyes. All winches must
be placed as Drawing 4. All winches shall be operated above
deck. The number of winches shall be 6. The make and size
of winch is unrestricted.
Carbon blocks are prohibited.
Standard stainless steel pulpit
and two standard stainless steel pushpits. Titanium and
carbon fibre is prohibited anywhere on the boat.
Standard bow fitting in stainless
steel and standard chainplates shall not be altered or removed.
The size, make and placing
of other deck fittings is optional. Extra cleat allowed
on mast to enable foredeck hand to hoist spinnaker. Pulleys
allowed on mast for pole inner end adjustment.
17.0 Luff groove headfoil
is permitted. Mandatory min. size of forestay foil see drawing
Trapeze, toe straps, hand
grips and the like to assist righting moment are prohibited.
18.1 All heavy equipment such
as batteries, anchor, gas bottle, tanks, instruments etc.,
shall be securely fixed so that they cannot move in the
event of a capsize.
Internal engine Volvo: either
Type 2003-S. Dry engine weight,
including S-drive shall be 170 kg.
Type 2030-S. Dry engine weight,
including S-drive shall be 160 kg.
or any other engine as supplied
to standard specification from X-Yachts.
Standard build engine box
shall be positioned as per Drawing 3. Standard folding prop
approved by engine manufacturer. 80 litre diesel stainless
steel fuel tank installed as per Drawing 3.
17 February 1998 - Revisions
X-Yachts' representative and
formal IMX 38 Class Organizer
DK 6100 Haderslev