SUNBIRD 25 MOTOR SAILER
Rules and Restrictions
- Class Name:
The name of the class shall be Sunbird 25 Motor Sailer.
The class insignia shall consist of a red shaded circle 350 mm in diameter with a black flying bird superimposed on the circle. A black letter "M" , 150 mm high shall be placed immediately below the circle.
On completion of manufacture, a class number shall be allocated by the Sunmaid Association of Victoria Inc., and it shall be displayed on the hull of the yacht and on the sails, in accordance with the requirements of Yachting Victoria. Where club sail numbers are required to be used, the class registration number shall be displayed on the hull.
A minimum crew of two, including the skipper, is required, each of whom shall be capable of manoeuvring the yacht single handed in an emergency.
- Amendments to Class Rules and Restrictions:
Amendments to the Class Rules and Restrictions may be made only at a properly constituted committee meeting of the Sunmaid Association of Victoria Inc., after prior consultation with Sunbird 25 Motor Sailer owner-members.
- Hull and Deck:
The hull and deck shall be produced from approved moulds which conform to the Sunbird 25 Motor Sailer drawings by John Brooke MRINA. Hull and deck includes cockpit, interior, headliner, wheelhouse and hatch mouldings. Lead ballast shall be as prescribed by the designer and shall be securely fixed in place. Materials for the hull shall be solid glass reinforced plastic (GRP) except that timber and other materials may be used for fitting out purposes.
The completed hull, deck, interior mouldings, ballast, wheelhouse, interior timberwork, engine, fuel and water tanks, mast, boom, rigging, sails, cushions, rudder, toilet and lifelines shall have a minimum mass of kg - the Yachting Victoria Mass.
Waterline marks in the form of 12 mm diameter circles in a colour contrasting with that of the hull shall be affixed to the hull on the centreline at bow and stern. The bow mark shall be located mm below the deck level, following the curvature of the bow at the centreline. The stern mark shall be located mm forward of the intersection of the transom and the hull bottom, on the hull centreline.
A centreplate shall not be fitted..
The rudder shall be operated by wheel, situated within the wheelhouse. The rudder blade shall be mounted beneath the hull at the end of the skeg and be of a size and material as supplied by the manufacturer. The height of the rudder blade shall not exceed 610 mm and its width shall not exceed 500 mm.
The mast and boom shall be manufactured from the aluminium sections prescribed.
The mast section shall be Keeley LOD 10 (111.13 X 75 mm X 2.64 mm wall). The length, including end fittings, shall be 8765 ± 20 mm overall. The backstay shall be attached to the masthead fitting which may also support the main halliard turning block and the topping lift.
The forestay and cap shrouds shall be attached to the mast at a point 7520 ± 20 mm above the mast base. Spreaders shall be attached to the mast at a point 3720 ± 20 mm above the mast base and shall be 695 mm in length. The lower shrouds shall be attached to the mast at a point 3675 ± 20 mm above the mast base.
The gooseneck fitting for the boom shall be fitted in such a position that the top of the boom lies 1035 ± 20 mm above the mast base when measured along the aft edge of the mast.
Two bands of colour, contrasting with the colour of the mast and not less than 20 mm wide, shall be painted on the mast at a distance of not more than 7470 mm apart. The top edge of the lower band shall line up with the upper edge of the boom when the boom is in its functional position.
The boom section shall be E5308 (90 X 55 mm). The length shall not exceed 3110 mm from the centre of the gooseneck pin to the end fitting.
A band of colour, contrasting to that of the boom and not less than 20 mm wide, shall be painted on the boom with its inner edge 3050 mm from a point where the projection of the aft side of the mast intersects the top of the boom, when the boom is in its proper position relative to the mast.
Standing rigging shall consist of forestay, backstay, cap shrouds, lower shrouds and inner forestay. The cap shroud chain plates shall be positioned on a line 3270 ± 20 mm from the bow. The lower shroud chain plates shall be positioned 380 ± 20 mm aft of the cap shroud chain plates.
Adjustment during a race is permitted only on the backstay and inner forestay. Twin forestays or other means of facilitating headsail changes shall be permitted. Minimum standing rigging size shall be 4 mm diameter.
Maximum sail dimensions, when stretched firmly by hand on the floor, shall be:-
When the mainsail is set no part of it shall be outside right angle projections from the lower edge of the upper mast band and the inner edge of the boom band, as described in Clause 9, respectively.
| Mainsail ||Luff||7315 mm|
The number of battens in the mainsail shall not exceed three and the length of each batten shall not exceed 540 mm.
No edge of the headboard in the mainsail shall exceed a dimension of 120 mm.
| Genoa ||Luff||7300 mm|
|Leech ||7500 mm|
The recommended dimensions for smaller headsails are:-
| Working Jib ||Luff ||8077 mm|
| Storm Jib ||Luff||5334 mm|
|Foot ||2591 mm|
The following are not permitted:-
- Bowsprits or bumkins.
- Outriggers for sheeting sails.
- Any device, such as a trapeze, extending outboard to support crew members.
- Sail markings other than the insignia, registration numbers or manufacturer's trade marks.
- Reinforcement of sail corners other than as required to provide security for cringles.
- Sails manufactured from Mylar or Kevlar materials.
- Headsails fitted with battens.
- Cabin Fittings:
While racing, the following furniture shall be contained in the yacht:
- Bunk cushions.
- Table and general timber fitout.
- Auxiliary Power:
Sunbird 25 Motor Sailers shall be fitted with an inboard diesel engine.
The minimum power for an auxiliary engine shall be 13 horsepower (9.7 KW).
- Class Basic Handicap Measurements:
Deviation from the current, published Class Basic Handicap (Yachting Victoria) measurements for the Sunbird 25 Motor Sailer is not permitted.
Current Australian Yachting Federation " Special Regulations for Racing Boats" shall apply in all races. The category shall be specified in the Sailing Instructions for the particular race or series. In addition to the AYF regulations it is a requirement of the Sunmaid Association of Victoria Inc. that all Sunbird 25 Motor Sailers be fitted with:-
- An effective boarding platform.
- Pulpit and lifelines which comply with Australian Yachting Federation "Special Regulations for Racing Boats".
- An effective locking device on the cockpit locker. This lock must be secured at all times the stormboards are in place.
The Association reserves the right for its committee to grant temporary dispensation to yachts not meeting these Rules and Restrictions. Such dispensation will only be granted for minor deficiencies and shall apply only for a particular race or series.
The Sunbird 25 Motor Sailer Rules and Restrictions were originally prepared in July 1987. They are incomplete and will not be completed until an existing Motor Sailer is presented to Yachting Victoria for measurement and the allocation of a Class Basic Handicap.
In the meantime a Mark ll version of the Sunbird Motor Sailer has been developed and a small number of boats have been completed to this design. The Mark ll design is very different to the one specified above. It is 26 ft long, has a bigger wheelhouse which is enclosed, a larger engine, a centreplate and a number of other features which set it apart from its predecessor
Reprinted and edited in September 2004