You spent more time testing this than I did conceiving it

I did a bunch of reading as I was first concerned about just keeping the motor from burning out.

I was going to use a Zener and a resistor (I still have the parts), but I did not like that solution. I thought about DD but what I read lead me away from that as it did not seem better than the duals. Brush-less tail, hmmmmm, I could not find a motor I liked, plus I did not want the expense as I knew I was going to the T-Rex. I settled on Dual motors, as they seemed the most bang for the buck.

But the system I really like the best thought is a shaft drive tail, that gets power from the main. My son has that on a Walkera.

So my next project (since my T-Rex is up and running) might be a heli with a shaft drive tail. I'm thinking brush-less on the main and a shaft driven tail.

Or just go to a NOTAR system (No TAil Rotor).

Have fun!