Author: **lozz08** » Tue Aug 17, 2010 6:16 pm

Rip out your calculator, and do this:

enter the diameter of the hole that the air goes through to push the piston.

divide that number by two.

times the answer to that by itself.

times the answer to that by the number 3.142.

the result of all that is the area. now you times the area by whatever pressure you are using, and the answer to that will be the spring force.