ORIGINAL: Little-Acorn
That's what I was wondering. My little Walkera 4 controls the tail by increasing or decreasing voltage to the tail rotor motor, via a small ESC. SUpposedly it should be just as controllable as any other method, though perhaps unsuitable to inverted flight.
But for simple beginner helicopters, is it ever done that way?
A "normal" gyro controls the servo by sending a SERVO command/signal ... a series of pulses where the pulse width represents a servo position.
In order to get this to work with a tail motor ... you would need some circuit to convert a servo signal to a voltage/RPM signal to the motor.
This is what the tail motor controller does ... less the servo signal part. It gets "stimulus" from the "gyro" and feeds the motor an appropriate RPM/voltage signal. It's like a mini ESC for the tail motor.
I've never heard of connecting a real gyro to a tail motor ... even via an adapter circuit.
You have to accept a tail motor system for what it is ... YAW control for toy helicopters.