Thanks for the feedback GeeTwo!
The air volumes in the original copy were just there from me playing around with it to see what would happen. Integers were just a lot easier to type than small fractions and everything is nearly proportional, so they were nice test numbers for me.
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It would be great if the cylinder volumes were calculated from diameter and stroke
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Well now that you say that, its totally obvious. I've edited the original post to contain a spreadsheet that does just that, using Power Factor (Bimba's name for surface area, who knows why) and stroke length.
While the old sheet assumed that you had taken the volume of the tubing into account (or were at least comfortable with ignoring it), the new sheet has the option to include a specific quantity for it, based on the tubing's inner diameter and the length of tubing.
The middle complexity sheet only assess air balance, and so never shuts off the compressor. The assumption therein is that t=0 is the first actuation and that the pressure never returns to the maximum storage pressure, which at least in my team's history, is par for a match. That said, the more complex sheet does shut off the compressor when the maximum storage pressure is attained.
Cheers!