Andy Culpepper -> RE: 1st blanca build (Jul. 7 2011 23:49:37)
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Nice work Gimar. My solera is dished out to create a dome centered on the bridge (25 foot radius), but I also extend the edge of the dished part up to the soundhole and curve the lower harmonic bar slightly. Then I curve the bottom of the bridge a little bit more, to a 20 foot radius. This pulls up a kind of "cylinder" running along the grain, which I think adds a little extra stiffness in front of the bridge and discourages any dipping of the top there. The other purpose of a dome as you probably know is to prevent cracks, as the dome can fall slightly in low humidity instead of allowing the wood to crack (theoretically). The only thing I would probably NOT do is brace the top totally flat and then try to pull it up into a radical arch with the bridge, because it seems like that would create kind of a "crease" at the ends of the bridge wings. Everything else is fair game I would say but whatever you do it has to be factored in with the other elements of your top bracing, thicknessing, etc.
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