Well most varible pitched fans produce very little air flow at an aoa of 45 degrees which would be more like a relative pitch much greater, I did some research and once they stall the airflow goes down which only decreases the advance ratio raising the aoa further. So it would be for a prop. Once stalled the air flow would reduce and then the aoa would jump even further and possibly go well past 45 degrees. Also the noise of those fans is not that differant when stalled, but the airspeed is so much less I don't know it it matters. That is what this was about anyway the noise. I don't think those racer props are in a stalled condition, although their efficiency and thrust will improve greatly as they gain speed. But that is a function of the advance ratio and reduced aoa.

What is a blown elevator? Did you mean foam. Or were you refering to our aircraft elevators. That is a differant situation as the control force is not just the total lift but also the vector of the airflow that is diverted by the elevator. Lift that is 90 degrees relitive to the fuse does not have to be as large as lift that is 30 degrees.