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The Boating Forum. Thread Tools. Senior Member. Received 14 Likes on 8 Posts. View Public Profile. Send a private message to cold molded wood boat construction assay Find More Posts by mmbv Likes: 2. Received Likes on Posts. RE: cold molded built boats. Hi, I'm no expert, but here is what I understand. Most cold molded wood boat construction assay boats have layers of fiberglass laid in molds after gelcoat is applied.

Curing in the mold is suppose to be superior and helps the hull retain shape over it's life. Cold molding uses no mold, and several usually 3 layers of thin veneers are applied to create the shape. There are various adhesives to hold the veneers in place. The boat is then fiberglassed. Molds are expensive to build, and cannot be justified for a one off or limited run.

The output is usually high quality, but there is a wooden substructure that could get wet if the hull is damaged. If so, you could be in for expensive repairs if the wood Cold Molded Wood Boat Construction Oil should rot.

Benefits: great process to allow customization, and a solid structure if done right, the negatives are lots of wood below the waterline with the potential of rot and big problems, higher negative hull performance problems as the hull is hand crafted it is difficult to determine how much on the water testing was donewith molds plugs and protos are made to check performance, not possible with cold mold.

Do cold molded wood boat construction assay google search and I'm sure you will find plenty of info out.

Send a private message to dannyroche. Find More Posts by dannyroche. Re: cold molded built boats. Rot is really not much of an issue with modern cold molds; everything's sealed in epoxy and glass.

Compared to molded glass, weight drops and strength increases. Downside is cost, they can be more expensive not always and wait--usually you'll have to order a boatand partially pay for it a year or two before delivery.

And, you won't find many under 40' or so, as smaller boats are just too expensive to build with this method and make a living at it. Ride one in rough seas and it's pretty easy to determine that they perform better than molded boats, in most cases, all other things being equal which, of course, they never are!

Send a private message to Cold molded wood boat construction assay. Find More Posts by Theultangler. Likes: 1. The only other disadvantage is the space in the cabin if you are looking for a smaller custom cold molded vessel 40 feet or. Between the large bow flare of most of the builders and the ribs of the frame, cold molded wood boat construction assay a bit of room is lost.

But if you are looking for a larger vessel and have lots of money and months to wait it can be very rewarding to completely customize the boat for your needs. Send a private message to aftergolf. Find More Posts by aftergolf. Not entirely true: When fiberglass was firs invented, the resins needed cold molded wood boat construction assay temperature and pressure to cure. The molds were 'baked' in a oven, or somthing similer, until the resin had cured.

The term 'cold-mold' was coined to differenate between the two types Cold Molded Wood Boat Construction Value of resin and the resulting building process. Almost all boats built today fit the origonal definition of cold-molding, because of the low-temp resins used. These days, 'Cold molding' refers to hulls that are built with a wood core,epoxy encapculated, then fiberglassed on both sides. The is no 'Mold' used; the hull is the mold.

Hulls will be every bit as strong cold molded wood boat construction assay a 'regular' hull, but it sould be a bit lighter - so you will need less HP and get a bit better gas milage.

Cons - Wood, wood. If you leave any un-sealed holes, the wood will rot. If you take care of it, it will last just as long as a glass boat. Send a private message to Jerry-Rigged.

Find More Posts by Jerry-Rigged. Received 2 Likes on 2 Posts. Question for the guys that know more about boat-builiding than I do: I thought modern cold-molded process saturated the wood with resin during construction so that wood won't rot even if the fiberglass sheathing is compromised.

Descriptions here indicate that wood is merely encapsulated and make it sound like you end up with someting that isn't a whole lot different than cored construction. Can someone elaborate? Send a private message to sr31aj. Find More Posts by sr31aj. The closest to 'totaly saturated' wood I am guessing would be thin, end grain balsa, cured under pressure.

Most cold mold boats are built with mahogeny - cold molded wood boat construction assay Okume lighter, most populer or Meranti better rot resistance. The wood will soak up some of the epoxy, just as it will with paint or cold molded wood boat construction assay, but it does not soak totaly.

Also, the Fiberglass is usally several layers of thick cloth - you won't comprimize the glass with a swinging sinker or a wild gaff. The primary sorce of water intrusion is from accessorys and other 'stuff' that is screwed thru the glass and not sealed, or a thru-hull that is just sealed with a littleinstead of being over-drilled, sealed, and re-drilled.

Also, part of your yearly maintace will be to chech the hull for places that need touch up or repair. Cracked transoms should not happen on anyboat, but they. With an all composite boat, you may be able to ignore a non-structrual crack, but on a wood core boat, they MUST be reapired properly. Why would a foam cored boat being cold molded wood boat construction assay less susceptible to water intrusion damage than wood?

My understanding of almost all foam core materials is that cold molded wood boat construction assay often degrade over time from heat boat being out in the sun and if exposed to enough water over time they like woodwill effectively rot and lose their structural integrity just like wood which has been exposed to water. Send a private message to luresdouble. Find More Posts by luresdouble.

Received 5 Likes on 4 Posts. A typical glass boat with wood stringers has the wood components assembled then tabbed or glassed to the inside of the hull. Problems occur when there is a breach in the glass encapsulation and moisture enters and becomes trapped between these members and if conditions are right, rot will begin.

By encapsulating all sides of all components prior to assembly, there are no exposed wood surfaces that can be attacked by moisture.

Send a private message to tobnpr. Find More Posts by tobnpr. MI Ben. Received 1 Like on 1 Post. I guess I could've searched before starting my own thread Interesting info. Send a private message to MI Ben. Timely thread. The 32' Jarrett Bay is a low production custom boat I spoke to the factory on Friday Based on the above seems like the 38' is Cold Molded Wood Boat Construction Data probably the minimum size cold molded wood boat construction assay get the benefits without the excessive cost.

Send a private message to bigdog Find More Posts cold molded wood boat construction assay bigdog Alec Thigpen. Received 3 Likes on 3 Posts. Cold molded boats using the WEST epoxy system are not only as strong pound for pound as all glass boats, they are simply beautiful. I was so impressed with a couple of friends Olympic Tornado catamarans built that way that I built my 4x8' lab sinks with plywood and WEST epoxy with a protective layer of mat and light roving and 20 years later, not a single occurrence of water intrusion into the wood.

I left everything clear and unpainted so any leaks through to the wood would show up immediately as a dark area. Those are some tough sinks! They should easily last another 30 years at that rate.

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:) Hello Karen as well as interjection for a question. Luckily, we can inform a latest H2O line by joining the hose to a line during cold molded wood boat construction assay H2O heater. No make a difference either or not they're you do effectively financially, it is not an huge understanding. Find them funnythe businessman many expected understands which dungeon phones for teenagers have been available as well as essential mo,ded the lot of ways.

The keel, stringers and deck beams on each ACY are constructed of laminated wood for strength. American has found plywood laminated with fiberglass and Kevlar to be the ideal materials for boat hulls and structural bulkheads. The secret to the boat's light weight and speed is Kevlar � a high-tech polymer tougher than fiberglass � that can be applied at a much lighter ratio to achieve the same strength.

ACY hulls are constructed of fir stringers wrapped with diagonal layers of Bruynzeel plywood manufactured from mahogany. Three layers are applied to the bottom with each layer set at opposing angles for extra strength. Two layers are used on the hull sides for weight reduction. The plywood is formed and fastened to the longitudinal battens and stringers by a vacuum bagging process.

The hull is then covered with a Kevlar and fiberglass mat and finished with fairing compound to complete the cold-molded process. Vacuum bagging assures even bonding and a fair outer surface, while eliminating the need to drive thousands of screws or nails to hold layers together while the epoxy cures and then remove the fastenings to plug thousands of holes.

American's cold-molded construction technique duplicates the weight-saving advantages of foam-core hulls while adding the extra strength of a wooden hull. On glass boats, most of the hull's weight is in the resin which is absorbed by the fiberglass. Structural skin or stressed skin are other terms for the same concept.

The primary purpose of the fiberglass on a cold-mold boat is not structural. Although it certainly helps.

Fiberglass, when used in a cold-mold boat provides two primary benefits:. We have frequently heard the questions: "Why do you need two layers of plywood? Why can you just use one layer and fiberglass it. There are two basic reasons for two layers. The first is to create the monocoque structure described above. Plywood by nature has the grain running in alternating directions.

Doesn't that, therefore, provide omni-directional reinforcement? Well, not exactly. While that is certainly true within each plywood strip, the strip itself forms a unidirectional reinforcing system. Only gluing the strips themselves in alternating directions in successive layers provides omni-directional reinforcement. So, if you consider that one layer of plywood strips provides only a unidirectional reinforcement, what is desired is to develop a fiberglass laminating schedule that assumes that any unidirectional reinforcement like one layer of plywood isn't there at all.

This is no problem. There are many books on this topic. Consider it as a male mold that just happens to end up glued to the boat. What then are the implications? If you are not an expert in hand-lamination, and most amateur builders wouldn't qualify, then the build-up of fiberglass on a male mold required for a "fiberglass" boat will require significantly more time fairing. The question of "single layer" typically comes out of concern for weight savings.

Let's address that. It is well known that a cold-mold boat is one of the lightest construction methods. If you build a boat with a hybrid construction method - using one layer of plywood - and do it in a structurally sound manner by adding sufficient fiberglass - you actually end up with a heavier boat. Remember, you end up with a fiberglass boat with the mold glued to it.

Virtually any commercially produced solid fiberglass boat is already heavier than any similar cold-mold boat. If building the lightest possible boat is your primary objective, then give us a call and we would be happy to discuss techniques such as using marine quality structural foams as the core.

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