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Published 23.08.2015 | Author : admin | Category : Plywood Jon Boat Plans

To trace back the history of boatbuilding, you’d first have to build a time machine and travel back some 8000 years. Cold molding utilizes two or more wood “veneers” that are attached to a pre-fabricated jig to create the shape of a hull. 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. Fiberglass is actually short for “fiber reinforced plastic,” referring to the various weaves of glass fiber cloth that are laid down in alternating layers with any number of resins such as polyester, vinylester, or epoxy. Most fiberglass boats are built from a female mold that accepts multiple layers of fiberglass cloth or matt and resin that eventually cure together to form a hull shape. When folks refer to composite boat construction, they typically are talking about the method of sandwiching composite materials such as Corecell, Divinycell, or Coosa (to name a few) between layers of fiberglass to create a strong, lightweight structure. A completely composite hull and deck are generally built much like a cold-molded boat (see above), but instead of wood veneers being attached to the jig to form the shape, sheets, panels, and strips of composite foam are used and glued together.
This method, popularized mainstream by the easy-to-build kits produced by Chesapeake Light Craft, is how PropTalk’s Cocktail Class Racer Molotov was built. A stitch-and-glue boat is somewhat like a cold-molded boat in that veneers—in this case, marine-grade plywood—are attached to a jig that forms the hull shape. To subscribe to my model boats blog (no e-mail address necessary), RIGHT-click on the orange RSS button and then copy-and-paste the URL of this site's RSS feed into your RSS reader. Or click on the Google, My Yahoo!, My MSN, or Bloglnes button if you keep a personalized home page there.
Apr 03, 2015Bertram 38 Convertible - inspired "Dirty Deeds"Right after finishing up my previous vessel Berrinche, I embarked in this project in preparation to this boating season. Once there (according to the earliest recovered archaeological evidence), you’d likely find boats made from hollowed out logs used to cross rivers and travel short distances. 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.
Next, two or more layers of wood veneers are attached to the hull in opposite directions using screws with epoxy resin in between.


Fiberglass boat construction became popular in the 1960s and today is perhaps the most common way production boats are built.
First, the mold is cleaned and prepped with a mold release wax that allows what will become the fiberglass hull to be pulled from the mold without sticking. The resin by itself isn’t especially strong in a physical sense, but it does bond incredibly well to itself and when multiple layers of fiberglass are added you get a very strong structure. Pros for this type of construction are its immense strength but lightweight qualities, which mean a boat that typically weighs 20,000 pounds can be constructed to weigh 12,000 pounds. An example of a jig used to form the shape of a composite 27-footer at Bandy Boats in Riva, MD. Once the shaped of the hull has been achieved, multiple layers of fiberglass and epoxy are applied. But unlike a cold molded boat, the jig also serves as the boat’s structural framing and remains part of the boat.
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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.
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. Upsides to this method include relatively low maintenance, high strength, ease of repair, and generally low cost when compared to other boatbuilding materials. Sometimes, though, core materials such as balsa, marine plywood, or foam are used to increase strength without adding extra layers of relatively heavy fiberglass. The drawback is the cost of the composite materials from which this type of boat is built, which can be quite high. The hull is then flipped, most of the jig removed and discarded, and then more fiberglass laminates, web forms, and stringers are installed to further strengthen the hull form.
The outside panels, which form the hull and deck shape, are temporarily “stitched” together and to the structural pieces before beads of thickened epoxy called “fillets” are applied to the joints.


So while there are plenty of other ways to build a boat using aluminum, steel, wood planks, and even cement, we’ll cover the basics of fiberglass and wood and composite building methods for your reading pleasure.
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. Primary downsides are osmotic blistering in some hulls and sometimes heavy weight (unless used with composite materials). This is the tough, glossy, exterior finish that protects the fiberglass from ultraviolet rays, salty spray, fish guts, beer, and abrasion.
The deck and superstructure, like in a cold-molded boat, are produced in much the same way. Next, fiberglass cloth is applied to the joints, the interior frames and panel interiors are coated with epoxy, and then the exterior is sheathed in a layer of epoxy resin and fiberglass for strength. Some premier cold molding builders include Weaver Boatworks, F&S Boatworks, Spencer, and Jarrett Bay. Even with solid fiberglass hulls, stringers and bulkheads are used to provide a strengthening gird that keeps the fiberglass laminate from flexing too much.
This is part two where the hull frame is finished and getting ready for planking.Continue reading "Build an RC Boat Hull - Part Two"Aug 31, 2012RC Model Boats - An Introduction to Building Your OwnLearn to build RC model boats the easy and inexpensive way.
These projects are perfect for beginners and those looking for a cheap, easy, simple and fast build.Continue reading "RC Model Boats - An Introduction to Building Your Own"Aug 31, 2012Build an RC Boat Hull From ScratchA scratch built RC boat hull easy and inexpensive. Plans are available for download.Continue reading "Build an RC Boat Hull From Scratch"Aug 20, 2012Ironclads - From Casemates and Monitors to Pre-DreadnoughtsIronclads make great model boats. Simple solutions to many common questions surrounding home made RC boats.Continue reading "Radio Controlled Boats"Aug 06, 2012Simple Electric RC BoatsSimple Electric RC Boats build log.



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