ORIGINAL: tippy
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.
Yes, exactly. It is called an ESC. This is done all the time. A receiver, 2 speed controls and a head hold gyro. The Logictech 2100t is light enough. But I think that you will need a 6 channel receiver, and possibly a heli transmitter to be able to drive the remote gain.
I used a Futaba gy240 on my FP Piccolo back in the day. No remote gain on that, so it all worked with a 4 channel receiver. But it weighed a ton (ok, an ounce, but that was a huge % of total).
I have flown a lot of FP helis, and the ones that had a proper head hold gyro behave far better than anything else. FAR better.