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1. GENERAL PRINCIPLES
1.1 One-Design
The H-Boat is a one-design class.
Except where variations are specifically permitted, boats of this
class shall be alike in: hull, deck and keel form, construction,
weight and weight distribution; shape of rudder and sails.
All boats shall be built in accordance with these class rules and
the plans. Deviations from the plans are permitted for spars,
standing and running rigging, sheeting arrangements, rudder stock
bearings, tiller and tiller extension, lifting eyes, fittings on
deck, details of hatches and certain parts of the accommodation.
These items shall comply with the rules.
All boats, in respect of hull, deck, keel and rudder form and
construction and spars, shall comply with either the current class
rules, or the corresponding rules applying to them at the time the
first measurement certificate was issued. Any alterations or
replacements shall comply with the rules current at the time the
alterations or replacements are made.
Sails shall comply with the current rules.
Interpretations of these rules shall be made by the ISAF which in
coming to its decision may consult the International H-Boat Class
Association and the original plans.
1.2 These rules are complementary to, and shall be read in
conjunction with, the plans measurement form and measurement
diagram.
1.3 In the event of discrepancy between these rules, the
measurement form and/or the plans, the matter shall be referred to
the ISAF.
1.4 Administering Authority
1.4.1 The international authority for the class shall be the ISAF
which shall co-operate with the International H-Boat Association in
all matters regarding these rules.
1.4.2 In countries where there is no National Authority or the
National Authority does not wish to administer the class, its
functions as stated in these rules shall be carried out by the
International H-Boat Association or its delegated representative
(National H-Boat Association).
1.5 Neither the ISAF nor the International H-Boat Association
accept any legal responsibility in respect of these rules and/or the
plans, or any claims arising therefrom.
2. ADMINISTRATION
2.1 English Language
2.1.1 The official language of the class is English and in the
event of dispute over interpretation the English text shall prevail.
2.1.2 The word "shall" is mandatory and the word
"may" is permissive.
2.2 Licensed Builders
The H-Boat shall be built only by builders licensed to do so by
the ISAF. Applications for licences shall be made to the
International Sailing Federation which may issue a licence to a
builder considered to have appropriate production facilities,
knowledge and experience and to be able to fulfil such other
conditions as the ISAF may deem necessary. A licensed builder shall
be required to bind himself to comply with the class rules, plans,
specifications and measurements.
2.3 International Class Fee
An International Class Fee (ICF) shall be paid by the builder to
the ISAF for each boat built. As evidence of payment of the
International Class Fee the ISAF shall issue an official plaque.
2.4 Registration and Measurement Certificate
2.4.1 No boat is permitted to race unless it has an valid
measurement certificate.
2.4.2 ISAF Plaque. The ISAF Plaque shall be obtained by the
builder before the boat leaves his yard. The plaque will carry an
ISAF serial number. The builder shall insert on the plaque the
builder's name, serial number of plug and mould.
The plaque shall be fixed to the hull in an permanent manner in
the position indicated in rule 2.7.1 (see also plan no. A.3.4)
2.4.3 The certificate is obtained as follows:
The owner applies to his National Authority for a sail number
giving the ISAF Plaque number and the builder's name. The National
Authority shall issue a sail number only on receipt of these details
as evidence that ICF has been paid.
Each country shall start its numbering from "one", and
each number shall be used once only.
The boat shall be measured by an official measurer recognised by
the National Authority of the country in which measurement takes
place. The completed measurement form shall be supplied to the owner
of the boat.
The owner shall send the completed measurement form to his
National Authority together with any registration fee that the
National Authority requires. On receipt of this the National
Authority may issue a Measurement Certificate to the owner.
2.4.4 Change of ownership invalidates the Measurement Certificate
but shall not necessitate remeasurement. The owner may apply to his
National Authority for a new certificate, returning the old
certificate with any reregistration fee that may be required and
stating the necessary particulars. The National Authority may then
issue a certificate to the new owner.
2.4.5 It is the owner's responsibility to ensure that his boat,
spars, sails and equipment comply with the class rules at all times.
2.4.6 Changes and major repairs to the boat, its spars, or
equipment invalidate the certificate and require partial
remeasurement as the official measurer may determine.
2.4.7 Notwithstanding anything in these rules the ISAF or the
National Authority shall have the power to withdraw or to refuse to
grant a certificate to any boat.
2.5 Measurement
2.5.1 Only a measurer officially recognised by the builder's or
the owner's National Authority shall measure a boat, its spars,
sails and equipment and sign the declaration on the measurement
form.
2.5.2 Tolerances are given in these rules and corresponding
drawings to permit minor building errors or distortion through age.
2.5.3 The measurer may take supplementary measurements in order
to satisfy himself that the boat is in accordance with the class
rules. If the measurer considers that there is a departure from the
one design construction or these rules in any detail the National
Authority shall be informed. In such a case the National Authority
shall not issue a Measurement Certificate until the case has been
investigated and any necessary corrections have been made.
2.5.4 All boats shall be measured using the official templates
supplied by the ISAF.
2.5.5 New or substantially altered sails shall be measured by an
official measurer who shall stamp affix a licensed button or sign
and date the sails near the tack.
2.5.6 A measurer shall not measure a boat, its spars or equipment
owned or built by himself, or in which he is an interested party or
has a vested interest. Sails may be measured by sailmakers licensed
by their National Authority.
2.6 ISAF Measurement Instructions
Except where other methods of measurement are specifically
indicated all measurements shall be carried out in accordance with
the ISAF Measurement Instructions.
2.7 Identification Marks
2.7.1 The ISAF plaque shall be permanently fixed to the bulkhead
at the forward end of the starboard side cockpit locker so that it
can be clearly seen through the cockpit hatch.
2.7.2 Sail numbers shall be carried on the mainsail and spinnaker
in accordance with rule 3.6.1.3.
3. CONSTRUCTION AND MEASUREMENT RULES
3.1 Moulds
A master mould owned by the Finnish Yachting Association is
available for obtaining plugs. This master mould shall be used
unless permission not so to do has been given by I SAF.
In such a case a plug shall be made which shall be within
tolerances which are one half of those for a completed boat and it
shall be approved by the ISAF Chief Measurer before manufacture of
moulds is commenced.
Before production is started at the builder's premises the
production moulds shall be checked and approved by an official
measurer recognised by the builder's National Authority.
3.2 Hull
3.2.1 The hull, including the deck, cabin, cockpit, hatches and
inner hull moulding shall, unless otherwise stated, be for glass
reinforced plastic (grp) and shall be built according to the plans
and the laminate specification in Appendix 1.
3.2.2 The deck moulding without fittings or hatches shall not
weigh less than 180 kg. It shall be laminated to be of uniform
thickness.
3.2.3 Hull measurements shall be taken in accordance with, and
shall be within the limits shown on the measurement diagram and the
measurement form.
3.2.4 The accommodation shown on the plan is the minimum that is
required.
Two shelves above the aft berths, galley and locker, hatches in
the cabin sole and fiddles of wood around the berths are compulsory.
Additional accommodation may be installed but the centre of
gravity of the complete hull shall not be lowered as a result of
this.
The design and location of the galley and locker may be changed
subject to prior written approval being obtained from ISAF.
A full bulkhead with a hatch or a semibulkhead may be fitted
forward of station 9.5. The minimum thickness shall be 6 mm for
plywood or 4 mm for GRP.
3.2.5 The forecastle hatch and a cabin companionway hatch,
hatches in the cockpit seats and a hatch for the aft stowage space
are compulsory.
3.2.6 A well for an outboard motor may be fitted in the aft
stowage space.
3.2.7 Lifting eyes may be permanently fastened to two keel bolts.
The total weight of the eyes shall not exceed 4 kg.
3.3 Keel
3.3.1 The keel shall be of cast iron.
3.3.2 The keel may be galvanised and/or covered with any
synthetic material.
3.3.3 The weight of the keel shall be 725 kg ± 10 kg including
any coating.
3.3.4 The keel shall be fastened to the hull by seven 16 mm
diameter stainless steel or galvanised steel bolts.
3.3.5 The shape of the keel including any coating shall be
controlled using the official templates.
3.3.6 The aft end of the keel shall have a square edge. The
minimum width shall be 5 mm, the maximum 8 mm (see plan A1.3).
3.4 Rudder
3.4.1 The rudder shall be of grp and constructed in accordance
with the plans and the specification.
3.4.2 The rudder stock shall be of 25 mm diameter solid stainless
steel.
3.4.3 A bearing of phenolic laminate (such as Tufnol) or
equivalent material shall be fitted to the rudder stock trunk at
deck level.
3.4.4 A bearing of bronze or of stainless steel shall be fitted
to the lower part of the skeg.
3.4.5 The rudder stock shall be in the position indicated on the
measurement diagram and shall be vertical.
3.4.6 The tiller and tiller extension are not controlled by these
rules.
3.4.7 The aft end of the rudder shall have a square edge. The
minimum width shall be 4 mm (see plan A3.3).
3.5 Spars
3.5.1 Materials
The mast, boom and spinnaker boom shall be of aluminium alloy
containing not less than 90% aluminium.
3.5.2 Mast and Standing Rigging
3.5.2.1 The mast shall be stepped on the cabin top on the
centreline of the boat.
3.5.2.2 The forward face of the mast shall be 843 mm ± 40 mm aft
of station 8.
3.5.2.3 Two easily discernible marks, each not less than 50 mm x
20 mm, shall be painted on the deck so that the forward edge of the
aft marks and the aft edge of the forward mark indicate the
permitted limits for the location of the forward face of the mast.
3.5.2.4 The mast shall be an aluminium alloy extrusion. The
section shall have the following dimensions:
fore and aft 125 mm ± 10 mm including the groove for the luff
rope athwartships 90 mm ± 10 mm
The radius of the leading edge shall not be less than 20 mm and
the point of maximum width of the section shall not be less than 40
mm from the forward or or aft edge of the mast.
The wall thickness of the extrusion shall not be less than 1.5 mm
nor more than 5,0 mm.
3.5.2.5 The weight of the plain extrusion shall not be less than
2.20 kg/m.
3.5.2.6 The mast shall be straight and of constant section except
as permitted below:
Above the attachment point of the forestay the mast may be
tapered in accordance with the plan; The luff groove may be cut away
to provide entry for the mainsail bolt rope; The mast may be
reinforced with an internal sleeve below measurement band number 1.
A permanent set, due to distortion not exceeding 50 mm between
the upper and lower measurement bands shall be permitted.
3.5.2.7 Measurement bands, not less than 10 mm wide, which shall
be clearly discernible while racing shall be painted or otherwise
permanently marked on the mast as follows:
No 1 With its upper edge 550 mm ± 5 mm above the reference
surface on the cabin top. No 2 With its lower edge not less than
7040 mm and not more than 7050 mm above the upper edge of band No 1.
No 3 With its lower edge 8700 mm maximum above the upper edge of
band No 1.
3.5.2.8 The standing rigging shall consist of: upper (main)
shrouds, lower shrouds, forestay and backstay
They shall be made of stainless steel of circular cross-section.
3.5.2.9 The diameter of the backstay shall be 3 mm minimum. The
diameter of the other standing rigging shall be 4 mm minimum.
3.5.2.10 The attachment point on the mast of the upper shrouds
shall not be more than 100 mm from the lower edge of band No 2.
Note: For the purpose of this and subsequent rules the
"attachment point" is defined as the intersection of the
centreline of the wire and the surface of the mast or deck. Shrouds
and forestay shall be fastened to tangs or other external fixings or
by 'key hole' fittings.
3.5.2.11 The attachment point on the mast of the lower shrouds
shall be not less than 3320 mm and not more than 3620 mm above the
upper edge of band No 1.
3.5.2.12 The attachment point of the forestay on the mast shall
not be above the lower edge of band No 2 nor more than 100 mm below
it.
3.5.2.13 The backstay shall be attached to the mast as indicated
on the plan. A backstay tensioning system is permitted.
3.5.2.14 The forestay shall intersect the deck 1580 mm t 5 mm
forward of station 8. If the jib is attached to furling gear this
measurement shall be taken to the line of the forward edge of the
jib in its most forward position.
3.5.2.15 The main and lower shrouds shall intersect the deck not
more than 75 mm inboard from the sheerline. The attachment points
shall each be not more than 3250 mm nor less than 2850 mm from the
intersection of the centreline of the forestay with the deck,
measured radially.
3.5.2.16 The bearing surface of the sheave for the spinnaker
halyard shall not be more than 100 mm above the lower edge of band
No 2.
The spinnaker halyard shall not be supported more than 60 mm
forward of the forward face of the mast.
3.5.2.17 Spreaders as shown on the plan shall be fitted. The
spreaders shall be not less than 700 mm long measured from the face
of the mast to the bearing surface of the shroud. The centreline of
the attachment point of the spreaders shall be above and not more
than 200 mm from the attachment point of the lower shrouds.
3.5.2.18 A stop shall be fitted to the mast to prevent the line
of upper edge of the boom from being below band No 1.
3.5.2.19 The mast complete with all standing and running rigging
and supported at band No 1 shall not weigh less than 12 kg when it
is weighed at band No 3. For the purpose of this
measurement the halyards shall be fully hoisted and the standing
rigging secured along the mast. The ends of the rigging below band
No 1 may rest on the ground.
3.5.3 Boom
3.5.3.1 The main boom shall be an aluminium extrusion of
continuous section and shall have a continuous groove for a
boltrope. The dimensions shall be: depth 90 mm ± 15 mm and width 75
mm ± 15 mm. The weight of the extrusion shall not be less than 1.25
kg/m. Tapered or permanently bent booms are prohibited. However, a
set due to distortion not exceeding 30 mm between inner edge of the
measurement band and the inner end of the boom is permitted.
3.5.3.2 A measurement band, clearly discernible while racing,
shall be painted or otherwise permanently marked on the boom with
its inner edge not more than 3000 mm from the mast measured with the
boom in its lowest position and perpendicular to the mast. The
measurement shall be taken from the line of the aft edge of the mast
projected downwards excluding any local curvature due to the sail
entry.
3.5.4 Spinnaker Boom
When attached to the mast the outer end of the spinnaker boom
shall not be capable of extending more than 2415 mm from the face of
the mast. It shall be attached to the mast 950 mm± 30 mm above band
No 1.
3.6 Sails
3.6.1 General
3.6.1.1 The sails shall be made and measured in accordance with
Section G of the ISAF Equipment Rules 1997-2000, except where
otherwise specified.
3.6.1.2 The sails shall be made of synthetic woven material. The
cloth weight of the mainsail and jib shall not be less than 200
g/m2, and of the spinnaker not less than 35 g/m2. Unwoven
transparent panels with total area not exceeding 0.3 m2 are
permitted both in mainsail and jib. No transparent panel shall be
less than 150 mm from any edge of the sail.
3.6.1.3 The class emblem, national letter(s) and the yacht's sail
number shall appear on both sides of the mainsail. National
letter(s) and sailnumber(s) shall be on both sides of the spinnaker,
touching a horizontal centreline created by folding the spinnaker in
half horizontally at the half height of the leeches and at the half
of the vertical centre fold.
Letters and numbers shall be of the following minimum dimensions:
Height 380 mm Width (excluding number one and letter I) 250 mm
Thickness 55 mm Space between adjacent letters and numbers 75 mm
The class emblem shall be of a colour clearly discernible and
contrasting with the sail or be of two colours in accordance with
the plan and shall be of the following minimum dimensions:
Height 300 mm Width 440 mm overall Thickness 50 mm
3.6.2 Mainsail
3.6.2.1 The mainsail shall not extend above the lower edge of
band No 3 nor beyond the inner edge of the band on the boom. The
upper edge of the boom shall not be below the upper edge of band No
1.
3.6.2.2 The length of the leech shall not exceed 9190 mm.
3.6.2.3 The total width of the mainsail (including the luff rope)
between points on the luff and leech at half and three quarter
heights shall not exceed 1910 mm and 1110 mm respectively. Any
hollow in the leech shall be bridged.
3.6.2.4 The horizontal and vertical measurements of the headboard
shall not exceed 120 mm.
3.6.2.5 The total width of the mainsail (including the luff rope)
measured at right angles to the luff 400 mm from the head shall not
exceed 320 mm.
3.6.2.6 Not more than four battens are permitted in the mainsail.
The batten pockets shall divide the leech into equal parts ± 100
mm, measured to the lower edge of each pocket. The length of the
lower three pockets shall not exceed 850 mm measured from the aft
edge of the sail. The upper batten pocket may extend to the mast.
The inside width of the pockets, excluding local widening for the
purpose of inserting the battens, shall not exceed 60 mm.
3.6.2.7 Reefing gear, Cunningham and other tensioning devices are
optional.
3.6.3 jib
The jib shall be made and measured in accordance with the ISAF
Sail Measurement Rules 1993 except where varied herein. Where a term
or a measurement given in the ISAF Sail Measurement Rules is used,
it is printed in 'italic' type.
3.6.3.1 Construction
The construction shall be: Soft sail, single ply sail.
The sail shall have 3 batten pockets in the leech.
The following are permitted: Stitching, glues, tapes, bolt ropes,
corner eyes, hanks, batten pockets elastic, batten pocket end caps,
leech line with cleat, two windows, sailmaker label, royalty label,
sail button, tell tails.
3.6.3.2 Dimensions maximum
Luff length 7580 mm Leech length 7130 mm Foot length 2830 mm Foot
median 7445 mm Top width 45 mm Foot irregularity 40 mm Head Point to
point on foot 750 mm from Tack Point 7580 mm Head Point to point on
foot 750 mm from Clew Point 7360 mm Upper width between points on
luff and leech respectively 2450 mm and 2300 mm from the Head Point
935 mm Lower width between points on luff and leech respectively
5020 mm and 4720 mm from the Head Point 1870 mm Primary reinforce
ment from corner measurement points 380 mm Secondary reinforcement
from corner measurement points 1140 mm for flutter patches 115 mm
for batten pocket patches 200 mm Top batten pocket inside length 300
mm Middle batten pocket inside length 350 mm Bottom batten pocket
inside length 450 mm
3.6.3.3 The top of the jib shall be straight at an angle of 90°
to the luff.
3.6.3.4 jib furling gear is optional and can be installed with
its mechanism below or above the deck. When installed below deck the
forestay shall have a sealed radial bearing system at the
intersection point of the deck. If a tube is used on the forestay it
shall be enclosed in the luff of the sail.
3.6.4 Spinnaker
3.6.4.1 The spinnaker shall be a three cornered sail symmetrical
about its centreline. It shall not embody any device capable of
altering its shape.
3.6.4.2 The lengths of the luffs shall not exceed 7300 mm. The
half width of the foot shall not exceed 2400 mm. The half width
measured between points on the luffs and the centrefold 3500 mm from
the head shall be 2650 ±50 mm. The total distance from the head to
the centre of the foot shall not exceed 9000 mm. This measurement
shall be taken with the sail opened out, laid on a flat surface and
with sufficient tension applied at the head and the centre of the
foot just to remove the wrinkles across the line of the measurement.
3.7 Weight of Boat
3.7.1 The total weight of the boat shall not be less than 1450
kg. Corrector weights, if any of lead shall be laminated to the
lower surface of the deck, evenly divided, at stations two and
eight.
3.7.2 The following parts and equipment shall be include in the
total weight:
Keel, rudder, tiller and tiller extension, minimum accommodation
according to the plan mast and standing rigging, all halyards and
the spinnaker boom guys, main boom (without mainsheet, kicking strap
and other loose equipment), all hatches and fixed fittings including
fairleads and tracks with sliders, winches and cleats.
3.7.3 The following equipment shall not be included in the
weight:
all non-fixed equipment such as spinnaker pole, life vests,
anchor and anchor line, paddle, bucket, pump etc., all blocks,
sheets and lines for trimming of sails, mattresses and personal
effects.
3.7.4 The following parts shall, if they are permanently fixed to
the boat, either be removed before weighing or their weight shall be
estimated and deducted:
compasses, fixed pumps with hoses, tightening devices for
backstay and kicking strap, jib furling gear, stove, toilet, lifting
eyes.
A list of estimated weights shall be included in the measurement
certificate.
3.8 General and Prohibitions
3.8.1 Loose Ballast
Loose ballast or ballast carried by the crew is prohibited.
3.8.2 Rigging Adjustment
3.8.2.1 The position of the attachment points of shrouds and
stays shall not be adjustable.
3.8.2.2 The length of shrouds and stays shall be altered only by
turnbuckles which shall be above the deck. They shall not be
adjusted while racing.
3.8.2.3 Sail trimming devices, except the jib luff adjustment
(Cunningham) and the backstay, shall not pass through holes in the
deck.
3.8.3 Mast Adjustment
The position of the foot of the mast shall not be altered while
racing.
3.8.4 Support for crew
When hiking no part of a crew-member's body between the middle of
the thigh and feet shall be outboard of the sheerline. The crew may
use handles and/or footstraps for safety. All footstraps or
contrivances shall be designed so as to come completely off the feet
in the normal act of tacking. The use of hobbles or individually
closed straps for each foot is specifically prohibited. One handhold
on the yacht's centreline on the foredeck is permitted.
3.8.5 Electronic Equipment
Digital compasses and devices transmitting or correlating data
relative to wind direction or speed or boat speed and location by
means such as, but not limited to, electronic, mechanical, hydraulic
or pneumatic are prohibited from use whilst racing. Any boats fitted
with this type of equipment shall have the display and master units
disabled to the satisfaction of the Race Committee.
3.8.6 Advertising
In Category A and B class events the organising authority shall
not require event sponsor's advertising to be displayed on yachts.
(RRS Appendix G G3.1(f)).
In Category B class events, advertising on sails (RRS Appendix G
G4.2(b)) shall only be permitted on spinnakers. Advertising on spars
(other than that permitted under RRS Appendix G G4.2(c)) shall not
be permitted.
3.8.7 A competitor's clothing and equipment shall not weigh more
than 10 kg, excluding clothing (including footwear) worn only below
the knee.
4. ADDITIONAL RULES APPLICABLE WHILE RACING
4.1 Unless otherwise specified there shall be at least two and
not more than four persons on board. 4.2 The following equipment
shall be carried on board: anchor of minimum weight 7 kg, 30 metres
of 12 mm minimum diameter synthetic fibre rope, one paddle, one
bucket, personal buoyancy for each member of the crew.
4.3 An outboard motor may be carried on board while racing.
OFFICIAL PLANS
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Images will be added later
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A.1 .1 Lines drawing
A.1 .2 Sectional drawing
A.1.3 Keel
A.2.1
General arrangement
A.3.1 Lamination drawing
A.3.2 Spars
A.3.3
Rudder
A.3.4 Details
A.3.5 Alternative main bulkhead
A.4.1 Sail Plan
A.5.1 Measurement Plan
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