i am designing something that has a frame of tubing that its relaxed when there is no air pressure in it, but becomes straight and reletivley rigid when when you put air presure in it.
The 2 foot diameter nylon sleeves filled with low pressure air that you see for advertising displays. If you try to use small diameter tubing, with flexible plastic tubing, it won't work. The closest tubing that does work is specially made for pressure gauges, and it just slightly uncoils under pressure.
