I am working on a project and managed to use up 7 servos for my aircraft. My ESC is rated for 7 analog servos or 6 digital servos without needed a BEC or external pack.

Other day I was flying and my servos locked and it nose right into the ground. I walked up to it and it was making a weird whining sound from the ESC. I unplugged and it locked again. I unplugged some servos and it freed back up. So I plugged the servos back in and wiggled around the sticks and it worked fine for a few then went and locked up again. I kept wiggling the sticks and they freed back up again.

So I was thinking that my servos may be to much for the ESC. It has a built a 3 amp swicth-mode BEC already but I am thinking I may have to much for it. I guess I never had anything like this happen before. I am more familiar with Gas and Nitros and never had issues. Although they dont use ESC so this is still new to me.

So my question is this what happens when an ESC has to many servos and it over does it? Does it lock? Anyone have anything like this happen before? Also could I just use an external battery source for my servos and put and on and off switch to power them only then have battery pack power motor? I was not sure seeing how the ESC powered everything before I was not sure what would happen if I plugged in a battery pack for servos if something would blow or if it would work.

If anyone had same problem or seen this before or know whats going on for that matter holler. I am a bit lost here. I just want to add another battery for my servos and move on. But not sure if I have to buy something to plug before that to keep it from blowing something.

Thanks!