It's just like a ceiling fan.
> I assume that counterweights are fitted to the rod journal's but I have
> never understood how that weight is determined. You are dealing with a
> mass[rod and piston] that is constantly changing its distance from the
> center of rotation and hence its crank counterwieght requirement. I
> assume the goal is just something that limits the stress'es. Is the
> fitted counterwieght a certain percentage of the rod and piston weight or
> what?
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