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We use two different properties of the wood's fibers, in various ways to match the needs and therefor the technics : strength and flexibility. The value of both varies in heartwood and sapwood, species dependent too, but it's never all or nothing (except for rotten wood). Both are usefull in...

You ! That's what you said in the previous post. I just took the size you said as an example. I mean, if you make a hinge on a 6" stump, then cut only 1/4" on both side, you lost 23% of the hinge's strengh (sideway), regardless of the wood quality. That's not a valid test in my book. Yo can't...

Your test is biased because when you cut the sapwood, the hinge isn't as wide as the uncut hinge. Like a lumber, the hinge's strengh on its side is function of the cubic of its length. Drastic effect with a small variation. You have to take an other stump a little bigger in order to get a full...