Pinnacle CRJs

[MarineGrunt]

Good points. I am new to the high speed/altitude stuff, so I may be off base...

I thought that as altitude and mach number increase, stall AOA decreases due to mach tuck....?

 

[FL420]

I thought that as altitude and mach number increase, stall AOA decreases due to mach tuck....?

I haven't cracked Aerodynamics for Naval Aviators in many years but as I recall mach tuck is a phenomenon associated with movements of the Center of Pressure(CP) over(or, more specifically, under) the airfoil and control surfaces due to local supersonic airflow. If so, it has nothing to do with stall AOA.

 

[DoinTime]

Any one know the Critica Angle of Attack for the CRJ-200? It's an interview question that I just can't seem to find the answer for.

This isn't going to answer your question but the wing on the CRJ stalls at varying AOA's as you progress down its span. The outer few feet of the wing actually stalls quite frequently while in the normal flight envelope. This posed a problem during flight testing as the ailerons were stalling and unable to provide adequate roll control while operating in the higher AOA range. Instead of redesigning the wing to eliminate this problem Bombardier instead moved the ailerons inward so that the outer 3 feet or so of the wing don't have control surfaces on them.