Max Truss Goal Post span

It's going to depend on the manufacturer and model of truss.

For example, XSF's published load tables end at 40' or 50' for a 12x12 truss depending on the connection option. I suspect at 50' the deflection of an unloaded truss is the limiting factor due to it sagging under it's own weight. Different models such as the 20.5x12 can support more weight over a longer span but all the published tables stop at 50'.
https://www.xsftruss.com/box-truss/

Other manufacturers should have similar tables available.

None of the above is a recommendation regarding the safe rigging of said truss. Talk to a professional.
 
As @sk8rsdad has said, it is entirely dependent on the manufacturer of truss. Anecdotally, I've found most truss tops out at 40' spans, but I've seen as low as 25' span. The other factors here are probably the more important ones. Where is this being used? What's on it? Indoor/outdoor? Do you have a safe and effective method to raise the span? Talking to a professional is the only way you'll be able to get all of those questions answered in a way that is safe.
 
As said above, this relies on a ton more variables than you've mentioned. Is it indoor on a concrete pad? Outdoor on smushy grass? Ballast? Guide wires?

Though LED movers are lighter, they're still movers. Synchronized movement can turn a stable static load into a dynamic one quickly.

Get a professional. We can point you in the right direction, but Controlbooth has a strict "don't tell people how to rig things" rule for liability reasons. We're far enough from a solution that I'm sure a few more people will chime in with advice, but you're eventually going to have to call somebody.
 
“The height of the pinnacle is determined by the breath if the base

As mentioned before there are a number of variables to determine if the specific goal post you want to build will work, all related to the center of gravity. This type of calculation is what I do as a professional rigger, and I would suggest you consult one to help safely design the goal post.

Ethan
 
It's all been said already, but allow one more voice to chime in with: consult a pro. There are many variables here we just don't know from the OP.
 
The answer is simple if you pretend you ignore the truss design for a moment and imagine you & you crew are on site to build it: how do you stand it up? How do you tip up a 20’ stick on end onto (or with) a 250lb base? How do you lift a 30’ span to the top of the posts — and bolt it up? How do you hang and cable the lights?

You can’t do this without a crane. A real one, with a real operator that costs real $$$. Now ask the crane questions: Budget? Space? Time? if any answer is no, tell your designer!

If you can hire the crane and get the permits and all that goes with, and you still think you have the time and $$$ for the engineering and crews, then you are playing in the big leagues for sure. Bless you and good luck! But since you asked this question I’m going to bet that’s not where you’re at...

When I do these kinds of thought exercises on my typical show budgets, I get a headache. My little gigs can’t afford the Genie to hang a mover 20’ up (don’t try to tilt that up!) much less a crane. And cranes don’t fit in the 2d floor ballroom anyway.

Bottom line: try to build & hang it in your head first. If it hurts, talk the designer down. if not, hire specialists to make it happen!
 
Thanks for the replys all. I always make sure that a rigger is hired when it is needed. It was indoors, and the height was lowered due to bad blueprints of the space and an incorrect ceiling height.

I more just asked the question out of curiosity and expanding knowledge, not for professional advice.

Thanks
 

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