It always amuses me when someone says and airplane is stall proof.

If you dive and pull up into a vertical climb what happens when the airplane
stops climbing and just plain stops. Does the nose only drop 3 or 5 degrees 
and start flying again or does it fall completely through to a vertical 
dive or does it fall over backwards? What about the torque reaction from the 
prop when the airplane is vertical and is not moving?

Paul Lamar
 
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