Need an 8 foot super rigid tube that needs to beak down into 2 foot sections Answered
I need to create a tube that is as small diameter as reasonable, relatively lightweight, and very stiff. It will be supported only on the extreme ends (thus the need for stiffness). There will be a comparatively light load, equally distributed over the entire length of the tube when in use.
The thing needs to build up to 8' overall, HOWEVER, no single section can be longer than ~2' when broken down.
My first thought was 1" PVC - it's NEARLY stiff enough, but a trifle bulky, and it does droop in the center by about 1.5". 3/4 EMT tube is great, and stiff over a 10' span (when in one piece). Problem is how to connect the sections together. Typical off-the-shelf EMT junctions tend sag just trying to support the tube with no load. I have a number of ideas that are likely overly complex and stupid, but was wondering if y'all might have a something that I have not thought about.