Discussion
Which of the following would not reduce real drift in a mechanical gyroscope?
Answer: B
Correct answer: Flying at a lower latitude
Latitude governs apparent drift, through the \( 15\sin\phi \) term, and has no bearing on real drift at all. Flying south does not make the bearings smoother.
The other three all attack the real causes: better rotor balance removes an unwanted torque, lower bearing friction removes another, and a higher rotor speed raises angular momentum so that any remaining torque produces less precession. Real drift is a matter of the instrument, not of where it is.
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