Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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Greg:
Don't know if it really matters, but all the mentions of "strip core" torsion boxes I can recall used solid wood for the core, not plywood.
I've built torsion boxes both ways - strip core and honeycomb paper. The latter is much much faster to put together, and the former can sound hollow or "tinny" when tapped between the strips. No thought on whether one is stronger than the other.
If you use paper honeycomb, it's easy to trim to size on the table saw with a little patience and care.
No experience gluing ipe. You might search on the Fine Woodworking forums (Knots).
After posting, I searched FWW on "ipe glue" and found the results most interesting. As many people found polyurethane and ipe to be a match made in heaven as those who had complete glue failure. Same with expoxy and other glues. Many advocated wiping with acetone prior to glueup to clean the ipe. Might be worth reconsidering the wood choice, or at least making a number of test glueups.
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