Originally Posted by project5k  please explain further. a 4" diameter cyl would have a radius of 2", 2^2 or 2 squared is 4. 3.14 times 4 = 12.56
the formula is pi times r squared, right? thats the area of the circle, or piston, then multiply that times the air pressure to get the output force? |
yes, but where you calced the area of a 1" cylinder you used 1" for the radius, and it's .5"
.5"*.5" = .25"
.25"*3.14*air PSI = 145