Airfoil Indicated Airspeed Stability 
Pilot Institute
JULY 11, 2025
Why don’t they use Indicated Airspeed just like the pilots who fly slower aircraft? Key Takeaways Mach number is a dimensionless ratio of true airspeed to local speed of sound. When you reach around 36,000 feet (11,000 m) near the tropopause, the temperature stabilizes at around -56.5 °C. Here’s why.
Flight Training Central
MARCH 3, 2025
Depending on design, airfoils used in general aviation, stall at angles of attack between 16 to 18 degrees. As the airspeed slows into the white arc, extend the wing flaps. When the airplane is stabilized in the approach attitude and speed, begin to smoothly and slowly bring the nose up to an attitude which will cause a stall.
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