Private Pilot License (PPL) Aerodynamics Practice Exam

The position of the center of gravity is critical for aircraft because:

1. It determines fuel efficiency

2. It affects the control and stability of the aircraft

3. It is only important for large aircraft

4. It enhances the aircraft's speed

The correct answer is: It affects the control and stability of the aircraft

The center of gravity (CG) is a pivotal factor in the aerodynamics of an aircraft due to its influence on control and stability. The CG is the point at which the aircraft's mass is concentrated and around which it balances. Its position affects how the aircraft responds to control inputs, how it maneuvers, and its overall stability in flight. When the CG is located too far forward, the aircraft may become nose-heavy, requiring additional control input to maintain level flight. Conversely, if the CG is too far aft, the aircraft can become tail-heavy, leading to a higher risk of stalling and a loss of control during flight maneuvers. Therefore, maintaining the CG within specified limits is essential to ensure safe handling characteristics and stability. In terms of the other options, while the position of the CG can influence fuel efficiency indirectly, it is not a primary determining factor. The statement that CG is only important for large aircraft misrepresents its significance, as CG plays a crucial role in all types of aircraft, regardless of size. Lastly, while CG can have an impact on speed in terms of aerodynamic efficiency, it is not designed specifically to enhance speed; speed is more directly affected by thrust, drag, and design factors. Thus, the