Hi Gang,
Isn't the title of this thread amusing, though.
E-props are obviously no more sensitive to balance, there is just no imbalanced engine pounding away to mask any imperfections in prop balance.
Think how much longer the airframes will last ... unless of course we get lazy about prop and spinner balance!
The point is well made, though, that this leaves us open to actually hearing some of the resonances that an out of balance condition can excite.
These are often hidden by "normal" engine vibration, in which case you inexplicably end up with a short-life airframe. We've all seen this.
Oh yes, and serious aeromodelers and drag racers eventually train to be better Engineers! Nyaaah ...
Best Regards to All,
Dean P.