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I remember hearing somewhere that at very high altitudes, the critical angle of attack for a given airfoil can decrease a bit. Is there any credence to this idea?

Thank you

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  • $\begingroup$ Good reference here two answers down. Mach number (true airspeed) appears to effect airflow over the upper wing, hence a change in critical AoA with altitude (even though IAS is the same). $\endgroup$ Jan 6 at 20:09

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