Hi @AbelDavid,
Yes, there will be some power noise from the ESCs, especially when the thrusters are run in air.
- Yes, the largest spikes are due to regenerative braking. This cannot be disabled completely without modifying and compiling a custom fork of the BlHeli_S firmware. You can fine more information in this thread, I expand on the explanation in my last post there.
- You can use a power filter to attenuate these spikes, a low-pass RC filter is a good place to start.
Normally, these variations are not an issue. Just out of curiosity, what exactly is your application/setup that makes this a concern?
-Adam