What value of average angular speed (ω avg) should we take while designing the flywheel out of the varying speeds of engine depending on its acceleration. And should we just assume Cf(co-eff. of speed fluctuation) according to our application or how is it? 
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$\begingroup$ doesn't the engine and flywheel run at the same RPM? $\endgroup$– jsotolaCommented Feb 10, 2022 at 19:57
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$\begingroup$ @jsotola some engines had 2 balance shafts as well as a crank... $\endgroup$– Solar MikeCommented Feb 10, 2022 at 19:58
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$\begingroup$ @SolarMike the flywheel would still be connected to the crankshaft ... the balance shaft is for cancelling vibrations $\endgroup$– jsotolaCommented Feb 10, 2022 at 20:08
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$\begingroup$ what value of ω avg should I put in this equation out of engine various angular speeds? $\endgroup$– KaneCommented Feb 10, 2022 at 20:10
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1$\begingroup$ When we were working out the primary and secondary forces we picked various engine speeds - 500rpm, 850, 1000, 2000 and even max rpm. Depends what you want to find out... $\endgroup$– Solar MikeCommented Feb 10, 2022 at 20:15
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