Why do we need to calculate CG?

Why do we need to calculate CG?

• A. CG is calculated for landing only
• B. CG is calculated for takeoff to ensure balance; after takeoff, trim can adjust balance.
• C. CG calculation is optional
• D. CG has no effect on takeoff

Answer: (B)

Center of gravity location determines how the airplane will balance and respond in the critical phase of takeoff and the early climb. Knowing and calculating the CG before takeoff ensures the aircraft will rotate at a safe speed, climb with controllability, and maintain stable handling during initial flight. If the CG is within the proper range, the pilot has a predictable pitch response and control authority right from liftoff. After liftoff, trim helps manage the airplane’s balance as conditions change—such as fuel being burned, load shifting, and configuration changes—reducing control forces and keeping the airplane on the desired pitch attitude. This separation is why we first verify the CG for takeoff to ensure safe rotation and initial climb, then rely on trim to maintain the intended balance once airborne.

Center of gravity location determines how the airplane will balance and respond in the critical phase of takeoff and the early climb. Knowing and calculating the CG before takeoff ensures the aircraft will rotate at a safe speed, climb with controllability, and maintain stable handling during initial flight. If the CG is within the proper range, the pilot has a predictable pitch response and control authority right from liftoff.

After liftoff, trim helps manage the airplane’s balance as conditions change—such as fuel being burned, load shifting, and configuration changes—reducing control forces and keeping the airplane on the desired pitch attitude. This separation is why we first verify the CG for takeoff to ensure safe rotation and initial climb, then rely on trim to maintain the intended balance once airborne.