Someone (sound) referee please....
Nick sez:
"you will realize that the height of the tail rotor above or below the main rotor hub has nothing to do with the hover angle"
That has got to be wrong.
... sure, for rotor heads with flapping hinges at a distance from the hub center there is a direct couple which will try to force the fuselage (hub) to adopt a similar attitude. The disc attitude is determined by the need to combat translating tendancy. So, yes rotor head type has a bearing on the subject - no dispute there.
If you eliminate the rotor head influence by choosing a pendulous type rotor head eg B206 teetering head (semi-articulated, semi-rigid) then you will see more clearly that TR height above or below the rotor hub is EXACTLY what does influence whether the fuselage is forced to roll right or left by the TR thrust.
I know it sounds counter intuative - but just try and look at it freshly again:
If the TR is above the hub it will attempt to roll the fuselage 'the wrong way' ie to the right.
It follows that with the TR in the plane of MR (ie at 'the same height') there IS NO rolling tendancy due directly to TR thrust (or MR's need to complete the couple).
Yes because the disc must 'tilt' to counter translating tendancy there is a force, at the head, which will attempt to tilt the fuselage to comply....
Rushed response...
I hope you can just say : "yes on that point you are right."
......... Otherwise I might have to say it!