Since ice buildup on the wing lowers the stall angle
of attack, the stall-warning sensor might not provide warning in icing conditions."
The maximum Cl for a certain AoA applied for an airfoil is known as stall angle
. The common stall angle
is between 10 to 15 degrees .
For example, the decreased stall angle
of attack due to icing is commonly used to restrict the incidence angle within its safe envelope.
The computed values of lift coefficient agree well with the experimental results up to the stall angle
. At the stall angle
, the experimental value of lift coefficient drops abruptly, while the computed lift coefficient continues to increase.
The AoA indicator has been promoted as a tool for avoiding unexpected stalls since, unlike airspeed indicators, they reflect the angle-of-attack situation relative to stall angle
at existing G loading.
* Reduce angle-of-attack below the stall angle
of attack (AoA);
It cannot detect a condition where one wing's AoA is greater than the other, and has no better than a 50-percent chance of warning the pilot that just one wing is nearing a stall angle
If we were to guess here, based on our reading of the accident reports, we would say that as with the moose stalls, the problem isn't airspeed itself, but bank angle and a weak grasp of wing loading versus stall angle
The main performance killer is drag and the effect icing has on the stall angle
of attack and, indirectly, stall speed.