Discussion
Consider the following pairs of cause and drift type:
Bearing friction - Real drift
Earth rotation - Apparent drift
Movement over the earth - Apparent drift
Rotor imbalance - Apparent drift
How many of the pairs given above are correctly matched?
Answer: A
Correct answer: Only three
The first three classify their causes correctly. Bearing friction applies a real torque and produces real drift; the earth's rotation and the aircraft's movement over it both produce apparent drift, the axis staying fixed while the reference frame turns.
The fourth is misclassified. Rotor imbalance applies an actual torque to the gyro, so it causes real drift. The test is whether the axis genuinely moves: a torque means real, a rotating reference frame means apparent.
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