CPL Aerodynamics Exam 2025 – Complete Practice Test Prep

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What happens to stalling IAS when the Center of Gravity (CoG) moves aft?

Stalling IAS remains unchanged

Stalling IAS increases

Stalling IAS decreases

When the Center of Gravity (CoG) moves aft, the stalling Indicated Airspeed (IAS) actually decreases. This phenomenon occurs due to the changes in the aerodynamic characteristics of the aircraft.

An aft CoG results in a reduction of the aircraft's static stability. Consequently, the aircraft becomes more prone to pitch up at lower angles of attack. Since stalling occurs when the angle of attack exceeds a critical threshold, a more aft CoG allows for a lower stall speed. This means that as the aircraft approaches this angle in its flight, it will stall at a lower IAS compared to when the CoG is positioned more forward.

This principle is crucial for pilots to understand, as it directly impacts how the aircraft behaves during critical phases of flight, emphasizing the importance of proper weight and balance management within the aircraft's design specifications.

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Stalling IAS becomes unpredictable

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