Re: stall warner at high speed during aeros?
What an intersting post! To pick up on a few points, P.P. is correct in stating that an aircraft may well stall if you snatch the control column rearward, but if you do this at an IAS significantly above the basic stall speed you risk overstressing the aeroplane.
As leonard17F implied, the manoeuvring stall speed is a function of the loadfactor (n). Clearly you don't need to turn to increase the loadfactor, you can also pull some 'g' . Fly at 1.41 x Vs1 and you can pull 2g before the ac will stall. Therefore, if you are flying S & L at just twice the basic stall speed the wings will be able to produce 4g before stalling! This may well exceed the 'g' limit of the aircraft.
A demo used when teaching stalling in the Tucano was to pull-up into a gentle wingover. Most stall symptoms were present, ie nose high, low decreasing IAS, sloppy control response, but even with lots of bank, the aircraft would not stall (an eye on the 'pointless' AoA gauge helped to make this a good demo). On the way back down from the wingover the IAS would clearly increase, but at a suitable IAS the stick could be pulled firmly rearward and despite the nose-low, high increasing IAS, firm controls etc, the aircraft could be made to stall well above the basic stall speed. The main point of the demo was to highlight to the student that the 'buffet' that occured just prior to the stall was a major indicator of the possible impending doom of stalling. As pointed out by JF, it is the high AoA that stalled the wing.
Long ago I met a Harrier head-on at low-level. He pulled the stick back sharply in an attempt to avoid a collision, and dully pulled the tailplane off the GR7 (plastic aeroplanes!), however, I digress.
H Peacock