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#1
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Plywood Composite Boats
In the book Devlin's Boat Building, Sam Devlin states that boats over 90'
have been built using these methods. Brian -- http://www.advantagecomposites.com/tongass -- My 22' Tolman Skiff project http://www.advantagecomposites.com/catalog -- Discounted System Three Resins products .. "JAGJR" wrote in message ... In regard to plywood/composite construction, have any large boats ever been built using this method? I'm thinking about "large" to mean any large pleasure or commercial boats As an example, does the Navy have any composite boats in its fleet? Any commercial fisherman on a composite boat? Are there any "composite constructed" Head Boats out there? Composite construction might save time and money but you need to consider longevity too ? Correct? I have been told a real boat deserves to be kept in the water; however, also been told plywood (composite) needs to be kept out of the water as much as possible ! So ....it's difficult getting an answer in regard to composite contstruction. Anybody have any knowledge of these type boats/construction that have been in service for more than a couple years? |
#2
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Plywood Composite Boats
"Brian D" wrote in message news:y_rpc.54753$xw3.3275430@attbi_s04... In the book Devlin's Boat Building, Sam Devlin states that boats over 90' have been built using these methods. Brian When I think of Plywood composite boats I think of plywood as the core material for a fiberglass lay up. Plywood is stronger than most cores and this strength is probably use in the structure of the boat so it is important that it remain dry an rot free. Not easy things to do over a long period of time. As long as it retains its structural integrity you can dry out cores by drilling holes ever few inches and vacuum bagging the hull until is stops loosing weight. The hot summer sun will help. As a core material plywood is a pretty good one it is inexpensive, strong, reasonably easy to work and not subject to catastrophic failure that plagues some other core materials when they encounter slamming loads. Even better is veneer that can be treated with a borate solution to rot proof it and laid up with epoxy to water proof it for a lighter, stronger more expensive and more durable core. Gordon |
#3
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Plywood Composite Boats
Is there a source(s) I can go to to learn how to treat a veneer with a
borate solution? |
#4
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Plywood Composite Boats
"Gordon Couger" wrote in message news:yMNpc.31057$bS1.19364@okepread02...
"Brian D" wrote in message news:y_rpc.54753$xw3.3275430@attbi_s04... In the book Devlin's Boat Building, Sam Devlin states that boats over 90' have been built using these methods. Brian When I think of Plywood composite boats I think of plywood as the core material for a fiberglass lay up. Plywood is stronger than most cores and this strength is probably use in the structure of the boat so it is important that it remain dry an rot free. Not easy things to do over a long period of time. Good thinking: Devlin designs plywood boats glued together with epoxy and glass. Plywood cored boats with epoxy/glass skins are very different. It is correct that in small boats, we use the properties of the core. It is an hybrid material, between plywood and sandwich. About large ones: once you get to 25-28', a foam core is a better choice. Lighter, stronger, no risk of rot. That is why se stop using plywood in that size range. Jacques from bateau.com |
#5
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Plywood Composite Boats
Lighter, stronger, no risk of rot.
That is why se stop using plywood in that size range. jacques, boats with balsa cored decks virtually ALL become squishy soft over time. boats with plywood cored decks almost never do, and those that do, do so only in small areas. plywood cored decks are almost as long-lived as solid fiberglass decks, and weigh less. Have heard repeatedly from highly experienced, long term naval architects that plywood hulls covered inside/outside and between plywood sheets are stronger pound for pound than most any other material out there. About the only thing that beats ply is damned expensive composites. Very few plywood boats out there, though. People think they are wood and therefore won't build they from scratch and won't buy used ones. |
#6
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Plywood Composite Boats
JAXAshby wrote:
jacques, boats with balsa cored decks virtually ALL become squishy soft over time. This is as true as anything else Jax posts. Have heard repeatedly from highly experienced, long term naval architects that plywood hulls covered inside/outside and between plywood sheets are stronger pound for pound than most any other material out there. That must explain why all the America's Cup boats are built from plywood. Very few plywood boats out there, though. People think they are wood and therefore won't build they from scratch and won't buy used ones. Yep plywood boats are so rare that they are really a tremendous novelty. I bet that nobody here knows as much about building boats from plywood as *you* do, Jax! DSK |
#7
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Plywood Composite Boats
dougies, so sleep it off
JAXAshby wrote: jacques, boats with balsa cored decks virtually ALL become squishy soft over time. This is as true as anything else Jax posts. Have heard repeatedly from highly experienced, long term naval architects that plywood hulls covered inside/outside and between plywood sheets are stronger pound for pound than most any other material out there. That must explain why all the America's Cup boats are built from plywood. Very few plywood boats out there, though. People think they are wood and therefore won't build they from scratch and won't buy used ones. Yep plywood boats are so rare that they are really a tremendous novelty. I bet that nobody here knows as much about building boats from plywood as *you* do, Jax! DSK |
#8
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Plywood Composite Boats
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