Re: Twitchy tail rotor

coustanis brought forth on stone tablets:
> I have an Heli-Max AXE CP all electric helicopter.
> Recently the tail rotor has become twitchy.  It changes it's RPM often
> and instantly.
> Twitchy is the best way I can describe it.
> This makes it pretty hard to control the heli.
> Thee heli has had a few tail strikes on the ground ( enough to break
> the rotor and gear teeth)
> and a few low altitude (3 or 4 foot) crashes but nothing I would have
> considered very bad.
> 
> Any idea what might cause this.  I hate to just start replacing things
> that aren't bad.
> Low transmitter batteries?
> Bad ESC.
> Bad tail rotor motor?

bad gyro?