HEATWAVE DINGHY CLASS RULES
PART A – ADMINISTRATION
1. Object of the Rules
The purpose of these rules is to define the Heatwave dinghy as a one-design class with respect to hull shape, but to allow some latitude in construction materials, cockpit design, deck layout, rig, foils and sail plan in order to foster interest in developing the Heatwave as an efficient and versatile racing dinghy.
2. The Heatwave Dinghy
The Heatwave was conceived by Stuart Gurney, and designed by Keith Callaghan. Together, they are the Heatwave Class SPONSORS. The copyright of the Heatwave design drawings and documentation is owned by the designer.
The prototype was built for Stuart Gurney, and has less freeboard and overall beam than later boats. It is identical to later boats below the designed waterline, and is allowed to race in the class.
3. Requirements for Racing
Before any Heatwave may be raced, the following documents must have been issued and endorsements obtained:
3.1 Building Fee Receipt/Sail Number Issue
A Building Fee must be paid on each boat at the commencement of building whether or not it is subsequently certificated. Payment should be made by the builder to the Designer and on receipt of payment the Designer will issue a Building Fee Receipt and Sail Number.
3.2 Measurement Certificate
3.2.1. First Certification
For yachts not previously certificated, the owner shall have the boat measured in accordance with Part B of these rules. Only a Measurer approved by the RYA, the Sponsors or the Heatwave Class Association shall undertake measurement. On completion of satisfactory measurement, the Measurer will supply the owner with a Measurement Form completed and signed.
The owner shall ensure that all relevant parts of the Measurement Form are completed and then apply to the Designer for a Measurement Certificate, enclosing the completed Measurement Form, and the Building Fee Receipt. Upon receipt of these the Designer may issue the First Measurement Certificate to the owner.
Should the Certificate become invalid due to the reasons (a) or (b) below, then the owner
shall apply to the Designer for a new Certificate returning the old Certificate together with details
of all changed particulars and the certification fee of £10.00. Upon receipt of these the Designer may issue a new Measurement Certificate to the owner.
Should the Certificate become invalid due to the reasons (e) or (f) below, then the owner shall
have the necessary items of the yacht re-measured in accordance with Part B of these rules.
Only a Measurer approved by the RYA, the Sponsors or the Heatwave Class Association shall undertake measurement. On completion of satisfactory measurement, the Measurer will supply the owner with a Measurement Form completed and signed in respect of the necessary items or will endorse the changes on the old Certificate. The owner shall then apply to the Designer for a new Measurement Certificate, enclosing the completed Measurement Form, if applicable, together with the old Certificate and the certification fee of £10.00. Upon receipt of these the Designer may issue a new Measurement Certificate to the owner.
3.3 Validity of Measurement Certificate
The Measurement Certificate is only valid provided:-
(a) There is no change of ownership.
(b) All sails have been measured and endorsed in accordance with rule A4 and comply
with these Class Rules or the Class Rules effective at the time when they were
(c) The buoyancy endorsement is current
(d) The hull, spars, and equipment comply with these Class Rules.
(e) No alteration, replacement or repair is made to the hull, spars, or equipment which
might change the dimension of an item in Part B of these rules.
(f) No alteration is made to the weight of the yacht or its corrector weights, if fitted.
3.4 Sail Measurement and Endorsement
Owners shall have all sails measured in accordance with Part B of these rules. Only a Measurer approved by the RYA, the Sponsors or the Heatwave Class Association shall undertake measurement. Upon completion of satisfactory measurement, the Measurer will endorse the
sail by signing and dating it near the tack.
3.5 Buoyancy Endorsement
Owners shall carry out a buoyancy test/inspection in accordance with Part B of these rules.
On completion of satisfactory test/inspection, the owner shall sign and date the buoyancy
endorsement on the measurement certificate and arrange for such signature to be witnessed
and endorsed by a club official. Subject to rule A.3.6, buoyancy endorsements shall remain valid
only for a period not exceeding twelve months from the date of the last endorsement.
3.6. Alterations, Replacements and Repairs
For the Measurement Certificate, sail and buoyancy endorsements to be valid, all hulls, spars, sails and equipment shall comply with the current class rules or those class rules applying to them at the time when the original Measurement Certificate was issued. Any alterations, replacements or repairs shall comply with the current class rules
3.7. Check Measurements
All hulls, spars, sails and equipment shall be liable to re-measurement at the discretion of the Heatwave Class Association representative or a race committee at any time and it is the owner’s responsibility to ensure that they comply with the appropriate class rules at all times. Notwithstanding anything contained herein, the Designer has the right to refuse to grant or withdraw a Measurement Certificate and/or sail and buoyancy endorsement from any boat at any time.
3.8. Notes on Responsibility
The Designer the Heatwave Class Association and an authorised Measurer is under no legal responsibility in respect of these Rules, plans or accuracy of measurement and no claim arising therefrom can be entertained. It shall also be made clear that it is the owner’s responsibility to contact an appropriate Measurer and to make their own contractual agreement with that measurer.
3.9. ISAF Advertising Code
Advertising is permitted in accordance with the ISAF Advertising Code sections 20.3 and 20.3.1(b) [Category C].
3.10 Changes to Class Rules
The safety requirement of sailing instructions shall take precedence of these class rules.
PART B – MEASUREMENT
1.1 The intention of these Rules is to ensure that in hull shell form, hull weight and sail area
all boats are as alike as possible. In other matters, such as deck layout, gear layout, construction method, foil design, the owner is encouraged to experiment and customise to his/her own requirements.
1.2 These rules are complementary to the plans and measurement form. Any interpretation of these Rules shall be made by the Sponsors, which may consult the Heatwave Class Association.
1.3 In the event of discrepancy between these Rules, the measurement form, and/or any
plans or drawings, the matter shall be referred to the Sponsors.
1.4 All boats shall be built in accordance with the Class Rules, specifications, Measurement Form and Measurement Diagrams.
1.5 Measurement tolerances are intended to allow for genuine building errors and change of shape through age, and shall not be deliberately used to alter the design. The Measurer shall report on the measurement form anything that is considered to be a departure from the intended nature and design of the boat, or to be against the general interest of the class, and a certificate may be refused, even if the specific requirements of the rules are satisfied.
2.1 No materials other than wood, plywood, closed cell structural foam, glass, polyester and epoxy based resins, paint, fillers and fastenings are permitted to form part of the hull shell, deck or interior structure.
2.2 Hulls may be built and/or finished by amateur or professional builders, except that GRP mouldings shall be manufactured only by builders licensed to do so by the Designer.
2.3 Hulls shells constructed substantially of wood shall conform to the "Heatwave Wooden Construction Plans" as issued by or on behalf of the Designer.
2.4 The Sheerline is the intersection of the lines of the top of the deck and the outside of the skin, projected if necessary
3. IDENTIFICATION MARKS
3.1 The hull shall carry the sail number as issued by the Designer cut into the upper face of the thwart in figures not less than 25mm in height.
3.2 The mainsail shall carry identification marks as detailed in Diagram A.
4. HULL MEASUREMENT
4.1 The one-design shape of the hull is to be strictly controlled.The exterior surface of the hull shall conform to the dimensions and tolerances shown in Heatwave Plans drawing ref “HW0006d frames_A0.dwg”.
4.2 Where the hull or decking is constructed substantially from wood then the following shall apply:
(a)Plywood shall be to BS 1088 or similar or better specification.
(b) The bottom planking shall be of timber of 7mm minimum thickness. It shall be sheathed inside and outside with glass cloth.
(c) The side planking shall be of plywood of no less than 6mm nominal minimum thickness. It shall be sheathed outside with glass cloth.
(d) The deck planking shall be of plywood of no less than 4mm nominal minimum thickness.
(e) The centreboard case sides shall be of plywood of 6mm nominal minimum thickness. The internal faces shall be sheathed with at least one layer of glass cloth.
4.3 Where the hull or decking is constructed from foam and glass, the glass layup shall be as follows:
(a) Hull below the topsides, centreboard case, cockpit floor, sidedecks: 2 or more layers with a minimum total glass weight of 600gsm on the external surface and 500gsm on the internal surface (except centreboard case: 600gsm).
(b) Topsides and foredeck: 2 or more layers with a minimum total glass weight of 500gsm on the external surface and 400gsm on the internal surface.
The following shall apply to all forms of construction unless otherwise stated.
4.4 A keelband of any cross section but not less than 2mm nor more than 5mm in depth and not less than 6mm nor more than 13mm in width shall be fitted to the underside of the hull on each side of, and over the full length of, the centreboard slot.
4.5 The internal width of the centreboard case at any point shall be not less than 26mm or more than 32mm, except that if the centreboard pivots on a stirrup, local widening in the area of the stirrup is permitted, so that the stirrup may be fitted.
4.6 The plan width of any outboard deck overhang, including rubbing strake, if fitted,
measured athwartships from the sheerline, shall be not more than 50mm. The outboard deck overhang shall not extend more than 70mm below the sheerline.
4.7 The distance between an athwartships line joining the line of the shrouds at the height of the sheerline and the aft face of the mast at the deck shall be not less than 270mm.
4.8 The weight of the hull in a dry condition including essential fixed fittings which are those normally screwed, glued or bolted in place, the centreboard and corrector weights if fitted but excluding rudder, tiller, sails, spars and all other removable items shall be not less than 70kg.
4.9 The total weight of correctors shall be not more than 5.0kg.
5.1 The centreboard shall be made from any combination of the materials listed in Rule 2.1 except within 10mm of its profile edge where any material may be used.
5.2 When fully extended below the keelband, no part of the centreboard shall be more than 925mm from the underside of the keelband.
5.3 When fully extended below the keelband the fore and aft width of the centreboard at keelband and at 600mm below the keelband shall be not less than 250mm or more than 350 mm.
5.4 The complete centreboard shall float in fresh water.
6.1 The rudder shall be made from any combination of the materials listed in Rule 2.1 except within 10mm of its profile edge where any material may be used.
6.2 The shape and size of the rudder is unrestricted, except that that the maximum plan area of any horizontal underwater section shall not exceed 65 sq cm.
7. SPARS and RIGGING
7.1.1 The mast shall be made of metal or carbon and when un-stayed shall be straight in way of the sail track or groove.
7.1.2 The mast, with all fittings removed, shall be able to pass through a 100mm diameter circle.
7.1.3 Distinctive coloured measurement bands of not less than 13mm or more than 26mm in
width shall be painted on the mast as follows: With the mast stepped in its normal position the upper edge of the lower band shall be not less than 590mm or more than 610mm measured vertically above the sheerline in way of the mast. The distance between the upper edge of the lower band and the lower edge of the upper band shall be not more than 5626mm.
7.1.4 The mast shall be deck stepped. The front of the mast at its foot shall be between 1150mm and 1300mm from the stem.
7.2.1 The boom shall be made of metal or carbon.
7.2.2 The boom with all fittings removed, shall be able to pass through a 100mm diameter circle.
7.2.3 A distinctive coloured measurement band of no less than 13mm nor more than 26mm in width shall be painted on the boom so that, when the boom is fitted in its normal position to the mast and at right angles to the mast, the forward edge of the band shall be not more than 2820mm from the aft side of the mast sail track or groove or its extension. The clew of the sail shall not be set beyond the forward edge of this band.
7.3 STANDING RIGGING
7.3.1 The following standing rigging shall be fitted:
1 pair of main shrouds
7.3.2 The following standing rigging may be fitted:
One set of spreaders.
1 pair of lower shrouds.
7.3.3 No other standing rigging is permitted.
7.3.4 Adjustment of the main shrouds, lower shrouds and forestay is permitted while sailing.
8.1 There shall be at least 3 separate buoyancy compartments in the hull. Each compartment must have an internal volume of at least 45 litres
8.2 Each independent buoyancy compartment shall be fitted with at least one hatch with
watertight cover. Drain hole(s), with stopper(s), may be fitted to each compartment.
8.3 At intervals not exceeding 12 months, the owner shall test the buoyancy as follows:
With the mast stepped, but with sails, boom, rudder, tiller and all loose gear removed, and the owner on board, not immersed above the knees:
8.3.1. The boat floating on its beam ends to port and to starboard with the mast horizontal shall float for a period of 15 minutes on each side or such longer periods as the owner may require. For this test, the mast may be supported above the top measurement band.
8.3.2 With the boat upright, when the cockpit is flooded the boat shall remain upright and reasonably level fore and aft supported solely by the boat’s buoyancy chambers for not less than 15 minutes.
8.3.3 After completion of the above tests, not more than four litres of water in total shall have entered the buoyancy tanks.
9.1 Only one sail is permitted whilst racing.
9.2 The weight and materials of the sail and battens is optional. The thickness of the sail shall not exceed 6mm at any point. This measurement shall not include thickness of boltrope, battens in the batten pocket, headboard, cringles or sail protectors.
9.3 Sail measurements as diagram B, or a sail which conforms to the Phantom class rules.
10. PERSONS ON BOARD
10.1 There shall be only one person on board during racing.
These Rules were last updated on 11 February 2006.