The gyro in a flight instrument remains rigid in space and the aircraft rotates about it.

The gyro in a flight instrument remains rigid in space and the aircraft rotates about it.

• A. False
• B. It depends on instrument type
• C. True
• D. Traditional gyros are not rigid

Answer: (C)

A spinning gyro behaves as if its axis stays fixed in space because of angular momentum. In flight instruments, the rotor’s axis resists changes in orientation, so the gyro appears rigid in space. The aircraft, with the gyro mounted in gimbals, rotates around that fixed axis. Changes in the airplane’s attitude cause the surrounding frame to move while the gyro’s axis remains pointed in the same direction, and that relative motion is what the instrument displays. Minor drift or precession can occur due to external torques and damping, but the fundamental idea is that the gyro’s axis is effectively space-fixed while the airplane turns about it. Thus the statement is true.

A spinning gyro behaves as if its axis stays fixed in space because of angular momentum. In flight instruments, the rotor’s axis resists changes in orientation, so the gyro appears rigid in space. The aircraft, with the gyro mounted in gimbals, rotates around that fixed axis. Changes in the airplane’s attitude cause the surrounding frame to move while the gyro’s axis remains pointed in the same direction, and that relative motion is what the instrument displays. Minor drift or precession can occur due to external torques and damping, but the fundamental idea is that the gyro’s axis is effectively space-fixed while the airplane turns about it. Thus the statement is true.