[quote=yurdle]I built the first one out of 1.5" OD, 1/16" wall, 6061. I used it today.
It flexes like crazy. I won't take it out 2-up, but 1-up it seems OK. I need to talk to someone that knows aluminum better than I, though, before I count on this one as 'safe'.
When flying a hull and trapped out, if you were to draw a line between the top of the front and back of the boom, I bet the top of the center of it is about 3" below the line. I don't know how much the aluminum can flex before giving out, but I'd imagine that it's nearing its limit. (at r=.5d, (1/24)d thickness, 64d length, and 2d distance of flex in the center...I think that's the relevant info for any of you engineers)
I also have a 1.5", 125 wall thickness tube, and a 2"OD, 065 wall thickness tube, both of which are FAR stiffer. If the blocks will fit on the inside of the 1.5"/125 tube I'll probably switch to that if this one breaks or if I get too concerned about safety.[/quote]
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