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 - Buying your first tractor: Choosing the right one - by Chris Pratt. They cost less than the tax on a new tractor (at least where we live). They have the weight to do the job. They are simple and understandable. They even have a history and can be restored to become a major source of pride and enjoyment. But how do you know what to buy and how do you make the right purchase? There is a surprising number of machines available in every shape and size imaginable. Like most things in life, your needs have a lot to do with wh
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