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Wood has always been a favorite building material for small crafts. Despite the advent of new materials and the increasing difficulty of obtaining suitable long-length, large end-section durable timbers, it is still popular. Developing new timber products, improved adhesives, and new techniques have made boatbuilding by the amateur much more popular. In order to provide guidelines for timber selection, Standards Australia publishes a Standard AS 1738-1975 Timber for marine craft
Timber for planking, stringers, chines, and ribs should be selected for straightness of grain, low shrinkage, and freedom from defects. If the boat is to be seaworthy, very few defects can be tolerated in these particular parts so knots, shakes, decay, compression failures, and brittle heart must be carefully excluded. Tightgumveins, borer holes, and surface checks will not cause trouble unless they are concentrated in a relatively small area. They can usually be satisfactorily caulked.
Sailing Boat for Sale Europe
Unless the boat is to be of glued construction or will be out of water for considerable periods, there is no need to use timber dried to 12% moisture content, except for interior fittings. However, because it shrinks while
drying, wood for the upper parts and internal framing should have a moisture content of less than 20%/while those parts customarily submerged should not be less than 20%. Of course, requirements such as these are usually much more accessible to specify than to observe because of
the·timenormally required to build a boat. All boards should be quarter sawn to minimize shrinkage during construction or when the boat is out of the water.
It is not always possible to build small craft entirely of durable timbers and, since the decay hazard in a boat kept on moorings is high, it is necessary to take precautions. Some preservative-treated plywood and timbers are available. Where such material is not obtainable, either from stock or on order, nondurable timbers should be liberally treated with a recognized preservative. Australian standard 1604- 1980 Preservative treatment for sawn timber, veneers, and plywood should be consulted for types of
preservative and appropriate loadings.
Timber and Plywood
The chief advantages of timber and plywood are:
- Positive buoyancy;
- High strength in relation to weight;
- Resilience and ability to withstand suddenly applied shock loads;
- Ease of shaping, bending, and finishing without the need for special equipment;
- Good appearance;
- High durability when properly selected/installed and ventilated;
- Ability, in many cases, to accept treatment with preservatives to give long-term durability under severe conditions and where ventilation is inadequate;
- Ease of working without requiring closely controlled factory conditions in respect of temperature and humidity;
- Resistance to abrasion;
- Ability to be altered at a relatively low cost.
Developments in plywood and adhesives have opened up a new field for constructing watercraft. The main advantage of plywood is that it is flexible and that it is obtainable in large sheets. Providing marine grade
plywood is used and correct methods of application are adopted, the plywood chine system is very successful. New methods, new materials, and new forms of construction have been tried and adopted and there is still scope for progress in these fields of construction