Hunter Medina One Design Class Rules
Revised 2015
1. ONE DESIGN RULES
This is a One Design Class. These rules are intended to ensure that boats racing in One Design events are as nearly alike as possible in all ways that might affect performance. All boats shall be built in accordance with the plans and as described hereunder.
2. PROTECTION OF ONE DESIGN
2.1 Production moulds for the hull and deck shall be made from plugs only obtainable from the master moulds held by Hunter Boats (or their successors).
2.2 If it is considered that any attempt has been made to deviate from the rules or the spirit of the rules, the Class Association has the right to withdraw permission to participate in Class Racing until it is satisfied that such deviations are rectified.
3. CONSTRUCTION
Construction shall be of GRP with wood and plywood interior in accordance with the master plans as held by Hunter Boats (or their successors).
4. KEEL
4.1 The keel shall be of cast iron and shall only be made from the master pattern.
4.2 The keel weight, with one coat of primer, shall be 213 kg +/- 10 kg.
4.3 The keel may be treated with resin or plastic coating. Casting blemishes may be removed or filled, but the casting shall not be ground down or built up in such a way that it departs from the standard shape.
4.4 Whilst racing the keel shall be locked in its lowest position and shall not be retracted.
5. RUDDER
5.1 The rudder blade design shall be optional so long as it has a wetted area in accordance with the profile and section shown on the master plans and shall be of any suitable hardwood.
5.2 Alternative rudder box designs are permitted, so long as the wetted area of the rudder has a profile and section in accordance with the master plans.
5.3 The design of the tiller and tiller extension are optional.
5.4 The rudder blade shall be fixed in its lowest position when racing.
6. SPARS
6.1 The spars shall be to dimensions as shown on the spars plan. Where replacement is required, equivalent spars identified by the Association Technical Officer may be used.
6.2 The mast shall be of alloy extrusion with a minimum 90% aluminium content with a continuous luff groove that shall be an integral part of the extrusion. Sectional dimensions shall be 91 mm +/- 3 mm fore and aft and 74 mm +/- 3 mm athwartships. The sectional weight shall be not less than 1.56 kg/m. The mast shall not be tapered, rotating nor permanently bent other than an acceptable set.
6.3 The boom shall be of alloy extrusion with a minimum 90% aluminium content. Sectional dimensions shall be 82 mm +/- 3 mm in depth including an integral foot groove and 68 mm +/- 3 mm in width. The sectional weight shall be not less than 1.46 kg/m.
6.4 The spinnaker pole shall be an alloy extrusion with a minimum aluminium content of 90%. The minimum o/s diameter of the boom shall be not less than 38 mm. No part of the spinnaker boom including fittings shall be capable of extending more than 2120 mm from the mast. The point of attachment of the spinnaker boom to the mast shall he a fixed single eye situated 300 mm +/-- 10 mm above the top of the lower band painted on the mast as shown on the mast plan.
6.5 12 mm bands of contrasting colour shall be applied to mast and boom as shown on the plan. The mainsail shall not be set outside the inner edges of these bands.
6.6 The mast shall be set on the centreline with its forward face or vertical projection thereof 00 mm 75 mm aft of the top of the forward edge of the top of the moulded mast plinth in the deck moulding.
7. RIGGING
7.1 Standing rigging shall be of multistrand steel construction.
7.2 The standing rigging shall comprise one forestay, one backstay, two upper shrouds and two lower shrouds. Minimum overall diameter 4 mm.
7.3 The spreaders shall be permanently fixed. The length of the spreaders shall be 670 mm +/- 10 mm. The distance between the outermost
points of the spreaders when fixed to the mast shall be 1400 mm +/- 20 mm.
7.4 The forestay shall be attached to the forestay plate glassed into the bow well by means of a forestay adjuster plate.
7.5 The upper and lower shrouds shall be attached to a single chain plate bolted to the coach roof sides, port and starboard, in the prescribed position by means of rigging screws.
7.6 The forestay and shrouds shall not be adjusted whilst racing.
7.7 The backstay shall be controlled by an adjustable tackle.
7.8 One mainsail halyard, one foresail halyard and one spinnaker halyard are permitted. Their exits shall be in accordance with the rigging plan.
7.9 The kicking strap shall be of tackle, lever or vang design.
7.10 Extended or additional jib sheet tracks, ahead of the mast, for sheeting smaller jibs correctly are permitted.
7.11 Twin foil or furling forestay are permitted, but foresail area must not exceed sail area shown in sail plan.
8. DECK EQUIPMENT
8.1 The boat shall carry a maximum of two halyard winches and two jib sheet winches. These shall be of a single speed variety.
8.2 Single jib sheet tracks shall be positioned port and starboard on the coachroof top in positions as shown on the deck plan. The used length of the tracks shall be 1220 mm +/- 10 mm.
8.3 The mainsheet track shall be fixed in the cockpit in the position as shown on the deck plan. Alternatively the mainsheet may be taken to a ring in the cockpit floor located immediately beneath the mainsheet track, and the original track removed.
8.4 A pulpit, pushpit and stanchions and lines shall be fitted in positions and to designs as shown on the deck plan. Stanchions shall not be angled outboard more than 10 degrees from the vertical.
8.5 The crew shall not position their torsos outside the life lines that shall pass through the top of the stanchions and shall be fully tensioned.
9. SAILS
9.1 Sails carried on board when racing One Design shall be restricted to one mainsail, one working jib, one intermediate jib, one No. 1 Genoa and one spinnaker. The mainsail shall carry the Medina Class insignia and individual boat’s class sail number.
9.2 As an alternative to three jibs on hanks, one furling jib is permitted for one-design racing.
9.3 All sails shall comply with the dimensions and minimum cloth weights as shown on the sail plan.
9.4 Non Dacron based and/or laminated sails are allowed within class rules and within the default class handicap rating (if any). However clubs with a fleet of Hunter Medinas may introduce local handicap rules based on sail material.
9.5 The mainsail shall have a maximum of 4 battens positioned as shown on the plan and to a maximum length of 600 mm, except that the top batten may be a full batten extending to the luff. The mainsail shall have a minimum of two sets of reef points positioned as shown on the sail plan. The mainsail may incorporate a luff and leech cunningham.
9.6 Loosefooted mainsails are permitted. Reinforcing on the mainsail to protect it from the spreaders are allowed. A single “sail shape stripe” is permitted in the mainsail.
9.7 The spinnaker shall be to dimensions as shown on the sail plan, and shall be measured in accordance with the I.O.R. guidelines.
9.8 Sails shall be measured with such tension between measuring points as will remove all wrinkles across the line of measurement and must include the fabric length between measurement points. The measurement point at the corner of a sail shall be the intersection of the adjacent outside edges projected. All other measurement points shall be at the extreme outside of the rope or fabric of the sail's edge.
10. INTERIOR ACCOMMODATION
10.1 All boats shall have a minimum interior structure incorporating the following items installed: forepeak berth structures, bow well structure, main saloon bulkhead, galley bulkhead, main saloon settee berths, galley top, main saloon floor, mast support strut, aft bulkhead dividing off stern locker. They shall all be to dimensions and thicknesses as shown on the plans.
10.2 The saloon settee berths shall have mattresses of a foam or Dunlopillo material and upholstered to a minimum thickness of 75 mm.
10.3 All boats shall carry a cooker and a chemical or marine W.C.
10.4 The two ballast pigs glassed into the bilge by way of the keel box at mould stage shall not be moved or removed.
10.5 Any boat without fore cabin berth mattresses fitted shall carry a 5 kg corrector weight fitted to the aft face of the bow well.
10.6 Any boat without 3 mm thick lining panels affixed to the underside of the main cabin deck head and without lining material fitted to the main cabin coach roof sides, under sidedecks and hull sides shall carry two corrector weights of 10 kg each fixed to the underside of the main cabin berth tops in positions as shown on the corrector plan.
10.7 Any boat not carrying an outboard motor of minimum weight 12 kg shall carry a 20 kg corrector weight fixed to the aft face of the half bulkhead glassed in beneath the cockpit sole. It is permitted to stow the outboard by the keel when racing (not advisable if the outboard is fitted with an integral fuel tank).
11. MANDATORY EQUIPMENT
11.1 One fixed steering compass of a minimum card diameter of 60 mm.
11.2 A BSI approved lifejacket or buoyancy aid for each crew member.
11.3 A horseshoe lifebuoy or similar throwing buoyancy aid.
11.4 One bucket and one hand pump.
11.5 One anchor of a minimum weight of 4.5 kg and not less than 2 metres of 3/16" link galvanised chain and not less than 30 metres of anchor warp of not less than 10 mm o/a diameter.
11.6 A keel lifting strut and winch.
11.7 A folding or rope ladder.
11.8 All moulded hatches and plywood main hatch washboards.
1 1.9 One oar or paddle.
12. OPTIONAL EQUIPMENT
12.1 An Echo-Sounder, VHF Radio (ideally with DSC) and GPS.
12.2 A speedometer or log.
12.3 An over or under-deck spinnaker chute, provided that this can be fully sealed off in a seamanlike manner.
12.4 A 12-volt battery and navigational lights.
12.5 Keel-bolt reinforcements ‘Top-Hats’.
13. PROHIBITIONS
13.1 Clothing designed to increase crew weight.
13.2 Movable ballast.
14. CONCLUSION
14.1 These rules are to ensure fair competition whilst also attempting to keep the cost of competing low. The weights specified for unlined boats are to ensure that such boats have no performance advantage.
WARNING: These rules are provided in order to promote one-design racing and do not provide a definitive instruction on equipping your boat. If you intend to modify your boat in any way, you must satisfy yourself of the safety of the proposed modification before undertaking any work on your boat. If you have any doubt, please consult a suitably qualified engineer. If you intend to compete in one design racing after modifying your boat you should contact the class association in advance of carrying out the modifications.
Revised 2015
1. ONE DESIGN RULES
This is a One Design Class. These rules are intended to ensure that boats racing in One Design events are as nearly alike as possible in all ways that might affect performance. All boats shall be built in accordance with the plans and as described hereunder.
2. PROTECTION OF ONE DESIGN
2.1 Production moulds for the hull and deck shall be made from plugs only obtainable from the master moulds held by Hunter Boats (or their successors).
2.2 If it is considered that any attempt has been made to deviate from the rules or the spirit of the rules, the Class Association has the right to withdraw permission to participate in Class Racing until it is satisfied that such deviations are rectified.
3. CONSTRUCTION
Construction shall be of GRP with wood and plywood interior in accordance with the master plans as held by Hunter Boats (or their successors).
4. KEEL
4.1 The keel shall be of cast iron and shall only be made from the master pattern.
4.2 The keel weight, with one coat of primer, shall be 213 kg +/- 10 kg.
4.3 The keel may be treated with resin or plastic coating. Casting blemishes may be removed or filled, but the casting shall not be ground down or built up in such a way that it departs from the standard shape.
4.4 Whilst racing the keel shall be locked in its lowest position and shall not be retracted.
5. RUDDER
5.1 The rudder blade design shall be optional so long as it has a wetted area in accordance with the profile and section shown on the master plans and shall be of any suitable hardwood.
5.2 Alternative rudder box designs are permitted, so long as the wetted area of the rudder has a profile and section in accordance with the master plans.
5.3 The design of the tiller and tiller extension are optional.
5.4 The rudder blade shall be fixed in its lowest position when racing.
6. SPARS
6.1 The spars shall be to dimensions as shown on the spars plan. Where replacement is required, equivalent spars identified by the Association Technical Officer may be used.
6.2 The mast shall be of alloy extrusion with a minimum 90% aluminium content with a continuous luff groove that shall be an integral part of the extrusion. Sectional dimensions shall be 91 mm +/- 3 mm fore and aft and 74 mm +/- 3 mm athwartships. The sectional weight shall be not less than 1.56 kg/m. The mast shall not be tapered, rotating nor permanently bent other than an acceptable set.
6.3 The boom shall be of alloy extrusion with a minimum 90% aluminium content. Sectional dimensions shall be 82 mm +/- 3 mm in depth including an integral foot groove and 68 mm +/- 3 mm in width. The sectional weight shall be not less than 1.46 kg/m.
6.4 The spinnaker pole shall be an alloy extrusion with a minimum aluminium content of 90%. The minimum o/s diameter of the boom shall be not less than 38 mm. No part of the spinnaker boom including fittings shall be capable of extending more than 2120 mm from the mast. The point of attachment of the spinnaker boom to the mast shall he a fixed single eye situated 300 mm +/-- 10 mm above the top of the lower band painted on the mast as shown on the mast plan.
6.5 12 mm bands of contrasting colour shall be applied to mast and boom as shown on the plan. The mainsail shall not be set outside the inner edges of these bands.
6.6 The mast shall be set on the centreline with its forward face or vertical projection thereof 00 mm 75 mm aft of the top of the forward edge of the top of the moulded mast plinth in the deck moulding.
7. RIGGING
7.1 Standing rigging shall be of multistrand steel construction.
7.2 The standing rigging shall comprise one forestay, one backstay, two upper shrouds and two lower shrouds. Minimum overall diameter 4 mm.
7.3 The spreaders shall be permanently fixed. The length of the spreaders shall be 670 mm +/- 10 mm. The distance between the outermost
points of the spreaders when fixed to the mast shall be 1400 mm +/- 20 mm.
7.4 The forestay shall be attached to the forestay plate glassed into the bow well by means of a forestay adjuster plate.
7.5 The upper and lower shrouds shall be attached to a single chain plate bolted to the coach roof sides, port and starboard, in the prescribed position by means of rigging screws.
7.6 The forestay and shrouds shall not be adjusted whilst racing.
7.7 The backstay shall be controlled by an adjustable tackle.
7.8 One mainsail halyard, one foresail halyard and one spinnaker halyard are permitted. Their exits shall be in accordance with the rigging plan.
7.9 The kicking strap shall be of tackle, lever or vang design.
7.10 Extended or additional jib sheet tracks, ahead of the mast, for sheeting smaller jibs correctly are permitted.
7.11 Twin foil or furling forestay are permitted, but foresail area must not exceed sail area shown in sail plan.
8. DECK EQUIPMENT
8.1 The boat shall carry a maximum of two halyard winches and two jib sheet winches. These shall be of a single speed variety.
8.2 Single jib sheet tracks shall be positioned port and starboard on the coachroof top in positions as shown on the deck plan. The used length of the tracks shall be 1220 mm +/- 10 mm.
8.3 The mainsheet track shall be fixed in the cockpit in the position as shown on the deck plan. Alternatively the mainsheet may be taken to a ring in the cockpit floor located immediately beneath the mainsheet track, and the original track removed.
8.4 A pulpit, pushpit and stanchions and lines shall be fitted in positions and to designs as shown on the deck plan. Stanchions shall not be angled outboard more than 10 degrees from the vertical.
8.5 The crew shall not position their torsos outside the life lines that shall pass through the top of the stanchions and shall be fully tensioned.
9. SAILS
9.1 Sails carried on board when racing One Design shall be restricted to one mainsail, one working jib, one intermediate jib, one No. 1 Genoa and one spinnaker. The mainsail shall carry the Medina Class insignia and individual boat’s class sail number.
9.2 As an alternative to three jibs on hanks, one furling jib is permitted for one-design racing.
9.3 All sails shall comply with the dimensions and minimum cloth weights as shown on the sail plan.
9.4 Non Dacron based and/or laminated sails are allowed within class rules and within the default class handicap rating (if any). However clubs with a fleet of Hunter Medinas may introduce local handicap rules based on sail material.
9.5 The mainsail shall have a maximum of 4 battens positioned as shown on the plan and to a maximum length of 600 mm, except that the top batten may be a full batten extending to the luff. The mainsail shall have a minimum of two sets of reef points positioned as shown on the sail plan. The mainsail may incorporate a luff and leech cunningham.
9.6 Loosefooted mainsails are permitted. Reinforcing on the mainsail to protect it from the spreaders are allowed. A single “sail shape stripe” is permitted in the mainsail.
9.7 The spinnaker shall be to dimensions as shown on the sail plan, and shall be measured in accordance with the I.O.R. guidelines.
9.8 Sails shall be measured with such tension between measuring points as will remove all wrinkles across the line of measurement and must include the fabric length between measurement points. The measurement point at the corner of a sail shall be the intersection of the adjacent outside edges projected. All other measurement points shall be at the extreme outside of the rope or fabric of the sail's edge.
10. INTERIOR ACCOMMODATION
10.1 All boats shall have a minimum interior structure incorporating the following items installed: forepeak berth structures, bow well structure, main saloon bulkhead, galley bulkhead, main saloon settee berths, galley top, main saloon floor, mast support strut, aft bulkhead dividing off stern locker. They shall all be to dimensions and thicknesses as shown on the plans.
10.2 The saloon settee berths shall have mattresses of a foam or Dunlopillo material and upholstered to a minimum thickness of 75 mm.
10.3 All boats shall carry a cooker and a chemical or marine W.C.
10.4 The two ballast pigs glassed into the bilge by way of the keel box at mould stage shall not be moved or removed.
10.5 Any boat without fore cabin berth mattresses fitted shall carry a 5 kg corrector weight fitted to the aft face of the bow well.
10.6 Any boat without 3 mm thick lining panels affixed to the underside of the main cabin deck head and without lining material fitted to the main cabin coach roof sides, under sidedecks and hull sides shall carry two corrector weights of 10 kg each fixed to the underside of the main cabin berth tops in positions as shown on the corrector plan.
10.7 Any boat not carrying an outboard motor of minimum weight 12 kg shall carry a 20 kg corrector weight fixed to the aft face of the half bulkhead glassed in beneath the cockpit sole. It is permitted to stow the outboard by the keel when racing (not advisable if the outboard is fitted with an integral fuel tank).
11. MANDATORY EQUIPMENT
11.1 One fixed steering compass of a minimum card diameter of 60 mm.
11.2 A BSI approved lifejacket or buoyancy aid for each crew member.
11.3 A horseshoe lifebuoy or similar throwing buoyancy aid.
11.4 One bucket and one hand pump.
11.5 One anchor of a minimum weight of 4.5 kg and not less than 2 metres of 3/16" link galvanised chain and not less than 30 metres of anchor warp of not less than 10 mm o/a diameter.
11.6 A keel lifting strut and winch.
11.7 A folding or rope ladder.
11.8 All moulded hatches and plywood main hatch washboards.
1 1.9 One oar or paddle.
12. OPTIONAL EQUIPMENT
12.1 An Echo-Sounder, VHF Radio (ideally with DSC) and GPS.
12.2 A speedometer or log.
12.3 An over or under-deck spinnaker chute, provided that this can be fully sealed off in a seamanlike manner.
12.4 A 12-volt battery and navigational lights.
12.5 Keel-bolt reinforcements ‘Top-Hats’.
13. PROHIBITIONS
13.1 Clothing designed to increase crew weight.
13.2 Movable ballast.
14. CONCLUSION
14.1 These rules are to ensure fair competition whilst also attempting to keep the cost of competing low. The weights specified for unlined boats are to ensure that such boats have no performance advantage.
WARNING: These rules are provided in order to promote one-design racing and do not provide a definitive instruction on equipping your boat. If you intend to modify your boat in any way, you must satisfy yourself of the safety of the proposed modification before undertaking any work on your boat. If you have any doubt, please consult a suitably qualified engineer. If you intend to compete in one design racing after modifying your boat you should contact the class association in advance of carrying out the modifications.