That video of the helicopter transitioning sideways along the runway is not convincing enough for me. I would really like to see the machine doing 360 pedal turns both ways while moving along the runway at that speed, now that would really be impressive.
Curious SLF here. If you moved the tail rotor(s) closer to the main rotor wouldn't you have to put more power through them because of their shorter moment arm? Halve the distance and you would need to double the torque....
Yes, you are quite correct in that the length of the tail increases the moment of the force. But in my suggestion you will have two of them which doubles the power however its not really that simplistic. The reason I suggested a shorter tail was more for the convenience in handling in tight spaces.