Regarding mass and balance calculations, a balance arm refers to the...
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A
distance from the datum to the center of gravity of a mass.
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B
distance of a mass from the center of gravity.
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C
point on the longitudinal axis of an aeroplane or its extension from which the centers of gravity of all masses are referenced.
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D
point through which the force of gravity is said to act on a mass.
Refer to figures.
Balance Arm: This is the distance from a specified reference point, often called the datum, to the center of gravity of the mass. This distance is typically measured in inches, feet, or meters.
A moment is defined as the product of a mass and its balance arm (distance from a reference point).
- Moment = Mass × Balance Arm
The moment is used to determine the torque created by the mass at a specific distance. In an aircraft, for example, knowing the moments of various components (passengers, cargo, fuel) allows for the calculation of the overall center of gravity of the aircraft. This is crucial for ensuring that the aircraft is balanced properly and can be controlled safely.
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Austro Control
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