Sporty's Ground School Private Pilot Course Practice Test

The correct formula for determining the center of gravity (CG) of an airplane is based on the relationship between weight, arm, and moment. In aviation, the moment is calculated by taking the weight of each component of the aircraft and multiplying it by its distance from a reference point, known as the arm. Therefore, the moment is expressed as weight multiplied by arm.

Once you have calculated the total moment for all components of the aircraft, the CG can be found by dividing the total moment by the total weight of the aircraft. This calculation provides the location of the CG in relation to the reference point being used.

Understanding this formula is crucial for ensuring the aircraft is properly balanced, as the CG affects flight characteristics, stability, and safety. Proper weight and balance calculations help pilots avoid situations that could lead to poor handling or control issues during flight.