My memory says that the strength is proportional to the square of the dimension. So 6 squared is 36 while 8 squared is 64. That means one is about twice as strong as the other when used in the vertical position. This needs to be adjusted downward for the thinner wall on the 8 inch material. I know this same principle works good when dealing with wood for practical purposes. Hope this helps.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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