I think (well, I try to...) In a full scale bird, at least, If you can get (or retain) forward momentum, the gyro-copter effect comes into play, with with horizontal air flow contributing to the main rotor's rotation and generating some lift (lift is a GOOD thing), makes sense that tail only serves as rudder control in this state. Same would seem to be true for model helis.

But, at some point, it becomes necessary to transistion to vertical flight. Brain says (I always talk to my brain, keeps me company, oh, where was I?) " in vertical flight without main power, ie: AR, whilst the airframe is descending (like a happy rock), it is advisable to clutch out failed power plant and apply somewhat negative pitch (positive pitch works also, but you need to let the main rotor stop rotating in it's powered direction and let it begin to rotate in the opposite direction because of induced atiflow,, would take even more time than reading my posts, all the while vertical speed is increasing and whatever altitude is left is rapidly decreasing), so, where was I,,, where am I?) Main power takes a break, mild heart attack, throw the clutch disengage, drop the collective, rootor keeps spinning, off we go, into a wild descent... At this point, upward airflow through the main rotor is forcing the rotor to keep moving. The kinetics ot the airframe (and horrified pilot) want to oppose the spining main rotor (or, you might want to think of it as resistance of the rotor to the airframe want to sipn the airframe and rotor as upward airflow influences the main rotor. bird spins like a top as it falls, somewhat slower, to the awaiting mother earth. Pilot recovers from subsequent mild heart failure and stomps on rudder pedal in an effort to overcome runaway yaw induced by the above (that's supposed to be one of the skills of AR)."

I would think something similar occurs in a model heli.

Again, My AR experience with the axe is that it ar's like a brick

Yall have fun!