Tail rotor drift happens if you keep the wings/rotor disc level - it is producing thrust laterally - therefore you have to tilt the rotor so that some of the MR thrust is directed laterally in the opposite direction.
That sorts out the drift - the roll attitude is the result of the forces balancing - the TR thrust and horizontal component of MR thrust create a rolling couple and the vertical component of MR thrust and the mass of the aircraft create an opposing couple.
Excellent use of physics there.
Tilting the the rotor happens, but didn't we establish in the earlier thread that there is also a main rotor head roll couple owing to offset blade hinges and that this could be very significant.
Some helicopters hover with roll even when the tail rotor is at the same height as the main rotor.
It is complicated in ways that I did not understand until coming here.
