I've read through most of this and found it all very useful and interesting, but there is one thing I haven't seen addressed (and if it has I missed it), but what are the average distances you guys have been using between your two long trusses on a tension boom? I am looking for a starting point, so even if you've nothing to back up your chosen distance, it'd be a useful starting point. Thanks!
Hmmm…, and I thought he must be referring to the compression member(s). Correct, common vocabulary would be helpful.What do you mean by distances between the two long trusses? I assume you mean the members in tension(It's not technically a truss, to my knowledge)? Aia's boomilever guide(the link should be here somewhere, it's on the wiki) has a lot of good starting information, and it talks about the spacing between the tension members, if that's what you mean. I'm not sure why this would vary from boom to boom, it seems like the spacing Aia talks about is pretty much accepted as what you want...
It may well be a viable solution; but no reason I'm aware of to say, "the most efficient." One difficulty with curved compression members is getting enough symmetry to work. Forces in those curved members are quite a bit more than they'd see in a bridge....Has anyone done any testing with a lenticular compression beam? I'm no civil engineer, but it seems to be the most efficient. The two arches with vertical bracing inbetween (I was thinking one or three centered) would brace against vertical deflection. I used a similar design with bridge and had success.
Look at section 4.b.iii. It states 1/4" wide and 3" long eye bolts.what is the length and OD of the eye bolt? I read and reread the parameters but couldn't find anything on it. (I know that this isn't where to ask for rules clarifications) Do you think they would allow our team to bring in an eye bolt that meets all the parameters so we know it will actually work?
You're right it doesn't specify the length, but it does spec the o.d- 1/4"That states the parameters for the three bolts that would be for the three holes in the testing wall not the eye bolt that attaches the chain to the mounting block. All it says in 4.c is that it has to be 1/4" threaded eyebolt.
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