I programmed this small microcontroller to perform the spool up and autorotation recovery for ESCs that don't have this feature built in.
If you are interested and into breadboarding I can provide you with the firmware. Send me a PM
DISCLAIMER: I make no assurances that it will work for you, that it will suit your needs or that it will perform the way it is intended to perform. This is a homemade prototype and you use it at your own risk.
Watch at YouTube
It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.