Nathan Sornborger writes:

I have an excel spreadsheet that might be useful for those interested in transmissions.
After fussing around with wanting different / better shift points, yet finding no meaningful
information on doing so, I took it upon myself to model the thing. The spreadsheet models the
centrifugal force-vs-governor pressure with the weights of the inner weight, outer weight
and spring, plus the spring rate and height. With it one can go from what they have to a new
configuration (lathe work and gram scale on the weights) to arrive at new shift behavior.
Click here to download the spread sheet.