I think that Doug fir has alternating hard and soft rings. Light and dark. The soft rings compress and allow the harder more flexible grains to bend and pull. Palms same to some extent. Foam with trimmer string in it. Euc and other hard brittle short grained trees have no soft grains…chair prone...
I agree from the samples of pine and fir I have cut. Flexible. I have only low back cut one eucalyptus, and it hinged more than usual…but it was a different species than usual too, so more testing required.
Yes, for same and different reasons. I was always a stump shot guy chasing hinge holding time. Finally it ocurred to me that hinges are not bending, they are pulling...I *think* (need to test) that a lower back cut pulls more fiber and holds longer.
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