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Mastering Stalls: How to Recognize, Prevent, and Recover Safely

Flight Training Central

Depending on design, airfoils used in general aviation, stall at angles of attack between 16 to 18 degrees. The main factors which determine the angle of attack of a wing are, airspeed, weight, and load factor. The indicated airspeed at which the airplane stalled is fairly consistent.

Rudder 96
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Mach Number Explained: What It Is and Why Pilots Use It

Pilot Institute

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. That’s the speed your airspeed indicator shows based on ram air pressure in the pitot tube. Here’s why. roughly) up to about Mach 5.0.

Pilot 52
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Air pressure and density

Professional Pilot

Aeronautical engineers improve continually on that imbalance with better airfoils and powerplants along with aircraft designs and materials to reduce weight and drag. In addition, decreased air density also decreases ram air pressure, meaning a indicated airspeed from a pressure-based airspeed indicator will read lower than the true airspeed.