The airplanes of the '20s and '30s often used Sitka spruce for the wing spars. Sitka spruce had an extraordinary strength-to-weight ratio, and was ideal for that application, given the rather anemic power-to-weight performance of airplane engines of the time. Unfortunately, the best spar material, and the only stuff that was suitable for wing spars, was that with very tight growth rings, which meant old-growth trees, because second-growth trees grew too fast and produced a coarse ring pattern. Since Sitka spruce also had applications in furniture, construction and musical instruments, the old-growth stands were rapidly depleted. You can still find it, but it's very expensive.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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