Discussion
Compared with the longitudinal problem, the lateral-directional problem is distinctive in that
Answer: C
The structural difference is exactly this: one oscillation and two real roots, against the longitudinal problem's two oscillations and no real roots. That is why lateral handling is specified with a time constant, a doubling time and a damping ratio - three different kinds of number - while longitudinal handling uses two damping ratios and two frequencies. The lateral problem certainly has an oscillation, is a quartic, and depends on speed and altitude as strongly as its longitudinal counterpart.
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