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Checking of plywood, what about birch plywood ?
On Wed, 12 Oct 2005 09:09:50 -0400, Jim Conlin wrote:
Alas, birch ply is a poor material for boatbuilding. Birch is not the least bit decay resistant and i've never seen a birch ply made with water resistant glue. Save it for furniture and cabinets. In 1989 I built cross-beams for my cat http://hem.bredband.net/b262106/ Carbon was way outside my budget and I didn't have the equipment or skills needed to create really good glass laminates. After some research I opted for a combination of (Scandinavian) Birch plywood and Sitka Spruce. Having looked up structural data for these I am not surprised these were many times the materials of choice for aircraft in the pre-aluminium era. I use epoxy for protection. I have had no problems with these beams. http://hem.bredband.net/b262106/Boat/beams.html /Martin |
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