04 Feb. 1991|
Wood boat building materials,free plans full size bunk beds,carpenter tools images,wooden clock hands - How to DIY
It is a glued construction method which is very popular with amateur boatbuilders as it is quick, avoids complex temporary jig work and does not require shaping of the planks. Usually composed of a base layer of strip planking followed then by multiple veneers, cold-molding is becoming popular in very large, wooden superyachts. As such, it is a popular material for amateur builders, especially for small boats (of e.g.
These hulls generally have one or more chines and the method is called Ply on Frame construction. A subdivision of the sheet plywood boat building method is known as the stitch-and-glue method, where pre-shaped panels of plywood are edge glued and reinforced with fibreglass without the use of a frame. The material requires special manufacturing techniques, construction tools and construction skills. The material rusts unless protected from water (this is usually done by means of a covering of paint). It is the lightest material for building boats (being 15-20% lighter than polyester and 30% lighter than steel).
Extensively refined in New Zealand shipyards in the 1950s and the material became popular among amateur builders of cruising sailboats in the 1970s and 1980s, because the material cost was cheap although the labour time element was high. It is not particularly abrasion resistant and it can deteriorate if fresh water or marine organisms are allowed to penetrate the wood. Cold-molded refers to a type of building one-off hulls using thin strips of wood applied to a series of forms at 45-degree angles to the centerline. The weight of a finished ferrocement boat is comparable to that of a traditionally built wooden boat. As the welding can be done very easily (with common welding equipment), and as the material is very cheap, it is a popular material with amateur builders.
Also, amateur builders which are not yet well established in building steel ships may opt for DIY construction kits.
Hulls built properly of ferrocement are more labor-intensive than steel or fiberglass, so there are few examples of commercial shipyards using this material.
The inability to mass produce boats in ferrocement has led there to there being few examples around. More recently introduced tropical woods as mahogany, okoume, iroko, Keruing, azobe and merbau.are also used. Many ferrocement boats built in back yards have a rough, lumpy look, which has helped to give the material a poor reputation.
With tropical species, extra attention needs to be taken to ensure that the wood is indeed FSC-certified.
Properly designed, built and plastered ferrocement boats have smooth hulls with fine lines, and therefore are often mistaken for wooden or fiberglass boats.