How to make rotating parts? Like propeller engines

[royals]

(First of all I don't know if this is the right forum but I hope so)

I know firespitter/KAX exists but how do they actually work (I'm too much of a C# noob so I can't really look at the source, even though that helps a bit)? I assume they change texture to a blurred one once the engine revs up, but before that, how do the parts rotate?

Would like to make something similar but with a passenger jet engine so the fan blades start spinning, is that possible?

Really appreciate all answers!

[lo-fi]

Firespitter comes with some of the best documentation you're ever going to get: https://docs.google.com/document/d/1iD52DfHft04Hb48TEhF5a4n5JOc8efUevdg5Y_QPICQ/edit

Should get you started.