Originally Posted by
chornedsnorkack
If you fly a plane along the back of power curve, with increasing AoA, increasing drag and sink rate, when can the plane be said to have stalled?
The power curve has nothing to do with it. If you want a more practical definition of aircraft stall than flow separation over particular components, it's when the lift coefficent decreases with increasing AOA. In that sense, because the whole airframe can produce lift, you could say it's an airframe issue.