Air Bag question

[Ziegelsteinfaust]

Something I never understood about air bags is how do you set the effective "spring" rate?

http://www.theslamstore.com/PhotoGal...&PhotoNumber=3

Lets say I use a RE7 bag that has a minimum height of 3", and a max height of 11 inches. So if I go for a 8" bag height I have a force of almost 2500 at 80 pounds. What does that mean?


On the web site they have a force chart, but how does that compare to the normal in/lb they normally sell springs in.

I so badly want an air ride suspension system one day although not likely anytime soon, but I am skeptical because I know others have done it that would meet my ideas. I just don't know where to start with a build set up.