This is more of a post for clarity and understanding, while maybe also helping people out in their builds through the answers this post receives.

Okay, so first and for most, could we use an S52 as an example?

So at what point would an S52 begin to experience significant Harmonic Vibration, is this down to power output or RPM? Or is it perhaps a combination of both?

What causes Orbital, Axial or Torsional Vibration? Is this random or case-by-case? Or does something specific cause each?

What would be the best way to solve each of these?

Thanks in advance and I am posting just to hopefully have answers that give clarity and concise answers about this.