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Moment (balance) arms are measured from a specific point to the body station at which the mass is located. That point is known as…

  • A
    The focal point.
  • B
    The axis.
  • C
    The datum.
  • D
    The centre of gravity of the aircraft.

Refer to figure.
Datum (relative to an aircraft) is that point on the longitudinal axis (or extension thereof) from which the centres of gravities of all masses are referenced.

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