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Over the millenia people have built boats out of all kinds of stuff. Bamboo, leather, paper, concrete. You name it, someone somehwere has tried it.

But by far the most popular contemporary boatbuilding material is a strange substance known as fiberglass. The term fiberglass is itself somewhat misleading, as it describes just one component of what is actually a composite material. The other component is a moldless fiberglass boat construction system resin, usually polyesteralthough vinylester and sometimes epoxy are increasingly used these days.

The principle behind any composite building material is simple. A binding medium that is not structurally sound can be stiffened and made stronger by adding another more moldless fiberglass boat construction system material. You cannot, for example, build a solid house of just mud or straw, but if you mix mud and straw together, you can build quite a strong house.

In all cases, the sum is much stronger than its parts. In this case, the medium is the resin, and the stiffening fibers are spun glass filaments ten times thinner than a single human hair. These fine glass fibers are in one sense quite fragile, but when held in column by plastic resin they are also stiff and strong. The resin begins as a liquid and becomes solid after a catalyst or hardener is added to it.

This is a chemical reaction moldless fiberglass boat construction system cannot be undone. Unlike thermoforming plastics like Moldless Fiberglass Boat Construction Number polythene and PVC that can be melted after they set and recast like metal, thermosetting plastics like polyester, vinylester, and epoxy become permanently solid after setting.

Applying heat softens them moldless fiberglass boat construction system bit and greatly weakens them indeed, they have very low heat resistance compared to most metalsand they may be set on fire, but they cannot melt and become fluid. The glass fibers come in rolls of fabric.

The most common sort is electrical-grade glass, known as E-glass, which was originally developed for use in electrical circuit boards. The alternative is structural-grade glass, called S-glass, which was developed for use in airplane construction. S-glass not surprisingly is a much better structural material than E-glass. It is nearly moldless fiberglass boat construction system again as stiff and has much better impact resistance.

Unfortunately, it also costs three times as much, which is why most boats are built of inferior E-glass. Quality builders often use limited amounts of S-glass to reinforce certain heavily loaded areas of a hull or deck, but only rarely do you see an entire boat built out of it. To make something as large moldless fiberglass boat construction system a boat out of liquid resin and floppy fabric, you need a mold to shape and support the materials until they solidify.

In both cases, multiple layers of fabric are built up into a laminate, and after the resin in all the layers has set up hard and cured, the now solid part can be separated from the mold.

When working with a male mold you are building up laminate from the inside out; the outermost layer goes on last, and if you want the outside of your boat to look nice moldless fiberglass boat construction system shiny you must fair and polish the exterior surface afterward. With a female mold, the outermost layer goes on.

Either way you must take the trouble to fair and polish the entire surface at least. But with a female mold moldless fiberglass boat construction system need do it only once though some intermediate cleaning and polishing is required and can then pop multiple fair-skinned boats from the mold. This is why production builders always use female molds. They also use gelcoat, a thin coat of resin thickened with colored pigment, as the very first layer in the laminate so boats emerge from their molds prepainted as well as prefaired.

One advantage of fiberglass construction is that it facilitates the creation of complex hull shapes. But some shapes are still easier to form than. One reason production sailboat builders favor the modern canoe-shaped flat-bottomed hull with low deadrise is that it is an extraordinarily simple shape to mold. You do have to bolt on a keel afterward, but that is a relatively simple matter of drilling holes and installing fasteners.

A classic full-keel shape with lots of deadrise and deep bilges, by comparison, is more problematic since it is often impossible to extract moldless fiberglass boat construction system deep, narrow keel from a one-part mold, no matter how carefully the mold is waxed. To ensure success a two-piece mold is often used, so the molded part can be more easily released by separating the halves of the mold.

It is also difficult to properly lay up and wet out fiberglass fabric in a deep mold with hard-to-access spaces. In other cases, with tumblehome hulls, for example i. Molds themselves, of course, must also be created. To build one moldless fiberglass boat construction system boat, it is often said, you must in fact build two boats: the finished product and the mold from which it springs.

With a female mold, you normally build three boats to get one�first a male plug on which the female mold is formed, then the mold, and finally the moldless fiberglass boat construction system. Capital costs, therefore, are quite high, which is why truly custom one-off fiberglass boats are quite rare. It is possible to build fiberglass boats cost-effectively, but only if many boats are born of the same mold.

This is what is unique about fiberglass construction. As late as the middle of the 20th century, boats were always built one at a time. Moldless fiberglass boat construction system the advent of fiberglass, however, boatbuilding has increasingly become an industrial process as opposed to a craft. The biggest builders these days can churn out hundreds�or even thousands�of boats a year on massive assembly lines studded with computer-controlled moldless fiberglass boat construction system that do everything moldless fiberglass boat construction system spraying gelcoat into molds, to cutting hatches and drilling holes for fasteners in decks, to cutting, trimming, and even varnishing interior woodwork.

But even on the most automated moldless fiberglass boat construction system line, a lot of manual labor is still needed for a boat to be built properly. Given the relatively small market for new sailboats, there is also a surprisingly large number of small builders who still build only limited numbers of boats using little automated machinery.

For many in the industry boatbuilding is primarily a labor of love; to them boatbuilding will always moldless fiberglass boat construction system an avocation and never just a business. Generally, however, the companies with the best long-term chances of survival are those that focus on economic reality and production efficiency.

One thing many mass-production builders have come to realize is that their biggest competition is not other builders of new boats, but the ever-growing number of older glass boats that are still on the water. It is now 60 years or so since the first glass boats appeared on the market, and there is still no evidence of any inherent limit to their useful life spans.

As far as we know, a well-built, carefully maintained glass boat can last virtually indefinitely. This, unfortunately, only encourages builders to produce boats that are less than durable.

Buyers who expect to trade in or sell a new boat within a few years need not worry about this, as serious maintenance issues are unlikely to arise in the first few years of ownership. To help those who find their cruising sailboats on the brokerage market i. Having a good basic knowledge of construction techniques can save you from making some big blunders when you buy a boat, so I encourage you to stay tuned.

BoaterMouth link:. A very thorough explanation and tutorial of the understanding of our fiberglass boats and the different processes used in their construction. You bring light to a system that is seldom understood by boaters. Moldless fiberglass boat construction system you.

There are many things to consider when build a boat, such as design and purpose. Having access to proven plans will help with these aspects of the boat construction process. Using a proven boat plan will save you time and money. Get access to a proven boat plans and 40 videos package which includes a variety of plans.

Save my name, email, and website Moldless Fiberglass Boat Construction File in this browser for the next time I comment. Please enable the javascript to submit this form. Related Posts. Charles Doane December 5, Charles Doane July 30, Leave a Reply Cancel Reply.

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