aerodynamicsFAA-published sample question (ATM, Aug 2021)
How does the stall speed (KCAS) vary as you climb from sea level to 33,000 feet?
A
It varies directly with a change in altitude.
B
It remains relatively unchanged throughout the climb.✓ Correct Answer
C
It varies indirectly with a change in altitude.
Explanation
Calibrated stall speed depends on the dynamic pressure needed to support the airplane, which the airspeed indicator measures, so it remains relatively unchanged with altitude; true stall speed increases. Only at very high altitudes do compressibility effects raise it somewhat.
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