http://w3n-a.blogspot.com/2008/12/st...teristics.html

Because of engineering design variations, the stall characteristics
for all airplanes cannot be specifically described; however, the
similarities found in small general aviation training-type airplanes
are noteworthy enough to be considered. It will be noted that the
power-on and power-off stall warning indications will be different.
The power-off stall will have less noticeable clues (buffeting,
shaking) than the power-on stall. In the power-off stall, the
predominant clue can be the elevator control position (full up-
elevator against the stops) and a high descent rate. When performing
the power-on stall, the buffeting will likely be the predominant clue
that provides a positive indication of the stall. For the purpose of
airplane certification, the stall warning may be furnished either
through the inherent aerodynamic qualities of the airplane, or by a
stall warning device that will give a clear distinguishable indication
of the stall. Most airplanes are equipped with a stall warning
device.


http://w3n-a.blogspot.com/2008/12/st...teristics.html