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Boat Forum / Building / April 2006Searching for links on plug making
Hi everyone, I am thinking about building a sailing boat in GRP, actually I want to build two identical boats. I want to build it like the pros, i.e. plug -> mold -> hulls Does anyone know of good webpages where i can find information on building a plug i.e. work process, materials etc. ? Best regards jlindberg For two boats, surely you jest Ed > Hi everyone, > [quoted text clipped - 8 lines] > > jlindberg Building a plug and mold is not worth the effort and cost unless you are planning to go into production. The plug itself can be built with relatively cheap material but it must be faired and polished with expensive tooling resins and a lot of labor. The materials for the mold will cost a lot more than a final hull. It has to be built with tooling resins and heavily braced to keep it from warping. Then it will require a lot of prep work before you can use it. In the end you will have the equivalent of 3 hulls invested in material and labor before you can start producing the first real hull. The best way to build two identical boats would be to make the station molds out of a durable material (plywood rather than particle board) and reuse them for the second boat.  SignatureGlenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com > Hi everyone, > [quoted text clipped - 8 lines] > > jlindberg > The best way to build two identical boats would be to make the station molds > out of a durable material (plywood rather than particle board) and reuse > them for the second boat. I was involved in building four 'identical' hulls this way 20 years ago: http://hem.bredband.net/b262106/Boat/build.html We did look into the mold alternative but came to the conclusion that it wasn't worth it. Signature======================================================================== Martin Schöön <Martin.Schoon@gmail.com> "Problems worthy of attack prove their worth by hitting back" Piet Hein ======================================================================== > The best way to build two identical boats would be to make the station > molds out of a durable material (plywood rather than particle board) and > reuse them for the second boat. Thanks Glenn, Saw your website, exiting project you are doing there. As you say on the site, boatbuilding isn't about money, it's about creating something. I will not be satisfied unless my final result is looking fair and shiny, like a pro build boat. Thus my thoughts about building a female mold for the hull. But if an equal quality can be obtained by building a male mold/plug and then fairing the outside of the hull to a pro result, this could be a way of doing it. So this method also has to be considered by me. Can you tell me if i can expect as nice a result with your suggested method as with a female mold and, in short, describe the methods/materials used to achieve this. I fear, that fairing a hull build on a male mold is quite demanding (sanding, filling and so on). Please tell me i'm wrong. I still would like to read more about how to make a plug for building a female mold, i.e. workprocess, materials etc. So if anyone has a link to pages where this method is descibed, i still would like to study this before desiding which way to go. Thanks for your answers. jlindberg Fairing is a lot of work whether you do it to a plug or do it to a hull. The quality of the final product will only be as good as the original pattern but the pattern has to be a lot better to make up for things that can happen building the mold and laying up the hull. As long as your lines are fair on the station molds getting a professional surface on a pair of one off hulls is not a lot more work than fairing the plug and preping the mold. Unless you have a lot of experience a lot can go wrong with a plug/mold process. The mold can warp during handling, the release agent can fail and anything wrong with the plug will be duplicated is anything build from the mold. SignatureGlenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com "Jens" <jlindberg@post4.tele.dk> wrote > > As you say on the site, boatbuilding isn't about money, it's about > creating something. I will not be satisfied unless my final result is [quoted text clipped - 13 lines] > pages where this method is descibed, i still would like to study this > before desiding which way to go. --Here's a link to a plug for what turned out to be a one-off. Still got the plug (sort of, long story). http://www.nmpproducts.com/bildboat.htm Signature"Steamboat Ed" Haas : I'll have the roast duck Hacking the Trailing Edge! : with the mango salsa... www.nmpproducts.com ---Decks a-wash in a sea of words--- |
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