Hi,
Sorry Mike for this late answsers, guessing the questions are for me!
My aim is to provide some information for those who want to compare a brand of shocks with another one, like x-factory drivers who can choose between AE, Losi or others.
Calculating spring rate is not that simple. I did look in some books to remind me some stuff and have to do it again but you need more than just oil and spring, you need the mass also.
I did push forward some investigation to provide a useful, trying to define with a figure how fast can move the piston depending the combinaison oil-piston used. You will find below a draft of the file, there is some information missing. The data on Kyosho piston are wrong, just a guess to start getting figure. So piston diameter and rod diameter are wrong. Do someone can provide the adequate data? With I'll complete the page and provide some details about haw to use it and maybe some others details.
http://www.petitrc.com/setup/ShockPistonComparison.pdf - Draft document, may disappear.