Chapter 8 question 84 - the given explanation is not helpful. At best, it fails

Question

Chapter 8 question 84 - the given explanation is not helpful. At best, it fails to provide any logical reasoning for a 30 degree orientation. (And it fails to explain 30degrees relative to what?) More likely the answer is wrong. I would greatly appreciate some clarification as to why 30 degrees is the correct orientation. I suspect the correct answer is the disk should be oriented flat, with the angular momentum vector straight up (or down). This would make the angular momentum perpendicular to both the pitch and roll of the ship, and would not affect steering (yaw). Chapter 8 question 84 - the given explanation is not helpful. At best, it fails to provide any logical reasoning for a 30 degree orientation. (And it fails to explain 30degrees relative to what?) More likely the answer is wrong. I would greatly appreciate some clarification as to why 30 degrees is the correct orientation. I suspect the correct answer is the disk should be oriented flat, with the angular momentum vector straight up (or down). This would make the angular momentum perpendicular to both the pitch and roll of the ship, and would not affect steering (yaw).

Explanation / Answer

When the angular momentum vector is titled through 60o, the angle between vector r and vector F becomes 30o.

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