Contents
What is the cause of stall?
A stall occurs when the angle of attack of an aerofoil exceeds the value which creates maximum lift as a consequence of airflow across it. Changing the effective configuration of a wing by the deployment of leading edge or trailing edge devices will directly alter the angle of attack at which an aerofoil stalls.
What causes stall speed?
Factors such as total weight, load factor, power, and center of gravity location affect stall speed—sometimes significantly. Stall speed increases as weight increases, since wings need to fly at a higher angle of attack to generate enough lift for a given airspeed.
How do you recover a power-on a stall?
Pilots must recognize the lead-up to a power-on stall to avoid it, or recover from it. The good news is that the recovery procedure is stone simple: Fly coordinated, and reduce the angle of attack. The stall horn will be quiet, the airplane will stop buffeting and accelerate, and it will stop trying to turn.
Which is not a direct cause of stall?
By “direct”, I mean for example that pitch is not a direct cause to stall, since pitch let AoA vary which causes stall. It’s unclear because there is a relation between angle of attack and speed. When we increase the angle of attack, we lower speed.
Why does the stall speed of an aircraft go up?
Due to Reynolds number effects, the stall angle of attack might be a few degrees higher, but details depend on the particular aircraft and it’s airfoils. Generally, your stall speed in a turn goes up with the inverse of the square root of the cosine of the bank angle.
When does a stall warning go into effect?
When the speed is reduced at rates not exceeding one knot per second, the stall warning, in each normal configuration, must begin at a speed (V sw) which exceeds the stall speed by not less than five knots or by five percent of the calibrated airspeed, whichever is greater.
How does pitch rate affect the stall speed?
The angle of attack dependency is discussed here. An increased pitch rate can push the stall angle of attack 50% higher than what the stall angle of attack is in stationary conditions. The next big factor is the Mach number.