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Brazilton KS | I built a 42' boom some years ago from old Ditchwitch boring machine stem. It is 1" OD and about 1/4" thick, and is very high tensile stuff. I used one piece about 18' long, one piece about 8' long angled ahead with about 1' space between at the inside, where it hooked to the fold hinge. Then used a third piece about ten feet long which I heated and bent in the middle to make a trangular truss on top. The center of the truss was where I attaced the chains to the top support, which were spaced out fore and aft similar to a Blumhart boom, and attached to a linkage suspended by an air shock. It survived as long as I knew where the sprayer was, and I was covering quite a few acres with the rig at the time. Wish I had a picture of it, I considered it to be a very successful design.
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Pipe vs square tubing for strength?
