Hi DD. Q #3 seems to get things started and I must react as Stan has it dangerously wrong!
A C172 will have full aileron authority to roll the airplane even in a full stall situation.
As you progress to the bigger puppies, this is not the case anymore.
What we are talking about is Angle off Attack. Each aircraft has an AoA cross over point, a speed where the rudder authority overrides aileron authority. So at high AoA’s you roll with rudder!
The reason to unload (the yoke forward) in stall excercises is to get the AoA away from Clmax to a point that all controls act in their normal way (no secondary effects anymore), this might even be to 0G!
Lets assume we are flying an approach, as this is the phase of flight where the speed lowers and the AoA rises. When one wing drops (for instance due to windshear or we’re messing things up and flying much too slow), the natural reaction would be to pick it up by aileron input. The aileron on the low wing goes down, thus increasing the camber of the wing and so the AoA, but what happens on the high wing is even more hair raising, the spoilers come up, whoops……gone is the lift.
So the only way out is by putting in rudder to get the wings level and unloading the aircraft to get the AoA down (of course in this scenario you have to keep an eye on not hitting the dirt).
Another interesting point is the runaway rudder. The only way out is to lower the AoA so that ailerons and not the rudder roll the aircraft again. After that get your speed above the cross over point to maintain aileron authority.
These are all unnatural actions to us. It’s nice to have a forum like this where we can get our minds in the right direction before we encounter these phenomena in real life