What is the formula for calculating the moment of an aircraft based on its weight and arm?

The formula for calculating the moment of an aircraft is based on the principle of torque, which is the rotational equivalent of linear force. In aviation, the moment is calculated by multiplying the weight of an object by its arm, which refers to the distance from a reference point (often the center of gravity) to the point where the weight is applied.

When you use the formula where moment equals weight multiplied by arm, you're effectively finding out how much rotational force the weight generates about the reference point. This calculation is essential for understanding balance and stability in flight, especially during takeoff, landing, and in various flight maneuvers.

In practical applications, knowing the moment helps pilots and flight planners ensure that the aircraft is loaded correctly and remains within safe operational weight limits, thus maintaining its stability and control in the air. The other alternatives provided do not accurately reflect the relationship necessary for calculating moment in aviation, emphasizing the importance of using the correct formula in operational contexts.