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���������� (�����, ���� � ������ ������������) | ���������� ������� | VK A major difference is the lamination schedule. The fiberglass skins used in foam sandwich are much thicker than in plywood sandwich. Building a foam sandwich boat step by step: � build a jig � plank the jig with foam panels � fiberglass the outside � flip the hull � remove jig � fiberglass inside � . The normal procedure in stitch and glue construction is to glass over all the seams of the boat with fiberglass and epoxy. Then the exterior of the boat is often sheathed in fiberglass. There is nothing wrong with this. The normal technique in stitch and glue construction is to coat all of the wood in epoxy, which effectively completely seals the. techniques. It has continued to sell well and has introduced thousands to wood/epoxy construction techniques. It has also been used by marine trade schools and Fiberglass Boat Construction Methods Pdf Online apprentice programs as part of their curriculum. In short, The Gougeon Brothers on Boat Constructionhas become a respected member of the canon of boatbuilding books.
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Share it! Facebook Twitter. With over two decades of experience in marine journalism, Lenny Rudow has contributed to publications including YachtWorld, boats. Boat Reviews. Basic Navigation Steve Colgate. Boating Guides. Boat Buyer's Guide. Boat Seller's Guide.

Spring Commissioning for Your Boat. Popular Articles Related Articles 1. Five Affordable Trawlers Under 40 Feet. What Hull Shape is Best? Best Boat Brands. What Type is Right for You? Iso-polyester resins are just strong enough to support most sophisticated glass fabrics, though they are probably not quite strong enough to be used effectively with exotic fabrics.

Vinylester resins are the next step up in quality and cost. They are similar to polyester resins and utilize the same catalysts, but are markedly stronger. For example, a good iso-polyester resin may elongate by as much as 2.

A vinylester resin, by comparison, can elongate up to 5 percent of its length before fracturing and has a tensile strength of about 11, pounds per square inch. This makes vinylester the resin of choice when laminating with more sophisticated fabrics. Vinylester is also much more water resistant than both ortho- and iso-polyester resins, thus is less prone to blistering. Because they are chemically similar and bond to each other well in both a cured and uncured state, vinylester and polyester can be used interchangeably in a laminate.

This gives builders great flexibility. As boat buyers have become ever more wary of blisters, even mass-production builders now increasingly use vinylester resin in the exterior layers of a laminate to reduce water permeability. They then switch to polyester to finish the bulk of the laminate and so Fiberglass Panels For Boat Building App keep costs under control. Vinylester is now also commonly used throughout laminates in racing and high-quality cruising boats.

The best, most expensive boatbuilding resin is epoxy , which is stronger than both polyester and vinylester. Its elongation before failure is usually more than 5 percent, and its tensile strength is about 12, pounds per square inch.

Epoxy is also more adhesive, forms better bonds particularly post-cure bonds , and is even more water resistant and thus more blister resistant than vinylester resin. Epoxy resin, however, is fundamentally different from polyester and vinylester resins. Its secondary component is not a catalyst that enables a chemical reaction, but a hardener that is integral to the reaction that causes epoxy to set and solidify.

To achieve full structural strength, it is best to post-cure epoxy at elevated temperatures. It is incompatible with most chopped-strand mat, as it does not properly dissolve the binder in the fabric. Plus, it is only semi-compatible with vinylester and polyester; it may be laid down on top of cured polyester and vinylester, but they may not be laid down on it, whether it has cured or not. Epoxy is often used when making repairs to fiberglass boats and may be used in the secondary phase of construction when structural parts are being attached to an already cured hull.

Epoxy is also often applied below the waterline as a barrier coat to prevent blistering. But because it is so very expensive, it is rarely used as the primary resin in a laminate, except in the most cutting-edge boats. The easiest way to lay up a fiberglass hull is by hand in an open mold. The resin itself can be applied in different ways. The crudest method is to simply slap it on with brushes from buckets of catalyzed resin. Now, however, it is more common to see workers wetting out fabric with airless spray guns or special resin-fed rollers.

With spray guns the resin and catalyst are mixed as they are sprayed onto the fabric. With rollers the resin is catalyzed just before being pumped to the roller head.

Spray guns and rollers obviate the need to constantly mix small batches of resin, which remains perfectly fluid for only a few minutes after it is catalyzed. Each step in creating an open-mold laminate is therefore a race to get the next layer of fabric laid down and wet out before the previous one sets up too hard.

One advantage of using polyester and vinylester resins is that the time it takes for the resin to kick can be controlled by using varying amounts of catalyst. Things have obviously changed drastically over the millennia, and today boats most typically are constructed out of wood, fiber reinforced plastic, composites, or a combination of all three.

Learn more about boatbuilding projects around the Bay in our Boatshop Reports. The veneers themselves are generally glued together using epoxy resin, and the outside of the formed veneer hull often is reinforced with layers of epoxy resin and fiberglass on both the inside and outside for strength and protection. Almost all custom Carolina-style sportfishing yachts are built using this method as different jigs can be constructed for each unique build, eliminating the need for expensive fiberglass tooling molds that is difficult to modify.

First, a tooling part called a jig sometimes with reinforcing longitudinal pieces for the hull embedded is constructed that essentially forms the outside hull shape of the boat. Next, two or more layers of wood veneers are attached to the hull in opposite directions using screws with epoxy resin in between.

Once the epoxy has cured, fiberglass can be added and the shape is faired and sanded. The hull is then flipped and much of the jig removed and discarded so fiberglass or structural reinforcements can be fitted to the hull interior, and interior construction can begin. The deck and cabin are built in much the same way. Fiberglass boat construction became popular in the s and today is perhaps the most common way production boats are built.

Upsides to this method include relatively low maintenance, high strength, ease of repair, and generally low cost when compared to other boatbuilding materials.

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