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Boat Forum / Building / December 2005question about building sailboat hull ...
I was looking at a site that showed a home builder's sailboat. He had some plans, set up a frame on the ground and made a cross piece frame .. He used plywood to sheath the boat. Epoxy on the plywood. Two things ... when building a hull, do you first need a backbone,,, keel,,, or whatever?? Another ,,, if you use plywood, can you glass over the ply and the ply becomes a core? >Two things ... when building a hull, do you first need a backbone,,, >keel,,, or whatever?? Not necessarily since there are many different ways of building a boat, but building a backbone and frame/mold is certainly a time honored method. >Another ,,, if you use plywood, can you glass over the ply and the ply >becomes a core? You can but you end up with a relatively heavy boat by modern standards. You can see the sequence I'm using at http://home.earthlink.net/~derbyrm/Chebacco.html The keel goes on after the bottom is epoxied to the bulkheads (but, hopefully, not to the molds). "Stitch and glue" is another scheme. It requires no building forms/molds and any keel is added later. Most plywood construction does have a layer of fiberglass on the outside these days, but the glass reinforces the epoxy to preserve watertightness of the wood, not the hull. It doesn't add any significant structural strength to the hull. (To reinforce against mostly submerged logs and jetsam from the container ships, one would have to add it to the inside of the hull.) Roger derbyrm@NOSPAMinsightbbNOSPAM.com http://home.insightbb.com/~derbyrm >>Two things ... when building a hull, do you first need a >>backbone,,, keel,,, or whatever?? [quoted text clipped - 8 lines] > You can but you end up with a relatively heavy boat by > modern standards. Is plywood as heavy as steel? If you cover it with fiberglass? For the backbone ... can you use wood that is put together rather than a solid beam? >>Two things ... when building a hull, do you first need a backbone,,, >>keel,,, or whatever?? [quoted text clipped - 8 lines] > You can but you end up with a relatively heavy boat by modern > standards. Nowhere close to being as heavy. Even with fiberglass, it's less dense than water. (It floats.) Steel ranges from 7.5 to 8 times as heavy as water. (It sinks.) If you laminate the pieces with filled epoxy, it will be better than a solid beam because you will get rid of the defects (knots, splits) and "cross" them with defect free pieces. Roger derbyrm@NOSPAMinsightbbNOSPAM.com http://home.insightbb.com/~derbyrm > Is plywood as heavy as steel? If you cover it with fiberglass? > > For the backbone ... can you use wood that is put together rather than a > solid beam? Hi there, I'm new in this group, haven't read all the archives, but why don't you try this site: http://www.bateau.com boatplans and free boatplans, with some pictures of construction of home build boats. (I have not connection or interests in that company). Best regards B19 > I was looking at a site that showed a home builder's sailboat. He had some > plans, set up a frame on the ground and made a cross piece frame .. [quoted text clipped - 3 lines] > Two things ... when building a hull, do you first need a backbone,,, > keel,,, or whatever?? Called a "strongback" it gives stability to the work. most boats need something. even some stitch and glue boats need something to hold the shape. > Another ,,, if you use plywood, can you glass over the ply and the ply > becomes a core? Caled "encapsulation" there should optiminally be three layers of resin-soaked fibre to keep water out of the wood on a boat kept in the water. > I was looking at a site that showed a home builder's sailboat. He had some > plans, set up a frame on the ground and made a cross piece frame .. [quoted text clipped - 6 lines] > Another ,,, if you use plywood, can you glass over the ply and the ply > becomes a core? Bolger's "Instant Boats" (books and plans available from H.H. Payson, ) offer an easy construction method that does not require lofting (Look into this if you plan to build a traditional boat -- means drawing the plans full scale so that you can find the mistakes in the measurements given in the published plans and so that you can make patterns for actually building. Many first time builders get so discouraged in the lofting phase that they never get to the actual building phase.) or a strongback (the cross-piece frame). BTW, traditionally, what you are calling a frame is usually called "molds" (or "moulds"). In traditional terminology, frames are a permanent part of the boat. > I was looking at a site that showed a home builder's sailboat. He had some > plans, set up a frame on the ground and made a cross piece frame .. [quoted text clipped - 6 lines] > Another ,,, if you use plywood, can you glass over the ply and the ply > becomes a core? Bolger's "Instant Boats" (books and plans available from H.H. Payson, http://www.instantboats.com) offer an easy construction method that does not require lofting (Look into this if you plan to build a traditional boat -- means drawing the plans full scale so that you can find the mistakes in the measurements given in the published plans and so that you can make patterns for actually building. Many first time builders get so discouraged in the lofting phase that they never get to the actual building phase.) or a strongback (the cross-piece frame). BTW, traditionally, what you are calling a frame is usually called "molds" (or "moulds"). In traditional terminology, frames are a permanent part of the boat. |
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