Discussion
The roll subsidence mode is
Answer: D
Roll subsidence is aperiodic and fast, its time constant equal to the reciprocal of the roll damping, \( \tau_R = -1/L_p \), typically a few tenths of a second. It is what makes a roll rate settle almost at once when the ailerons are held steady. It does not oscillate, so a one-cycle-per-second figure belongs to the Dutch roll. Being the fastest root, it cannot be the slowest, which is the spiral. And it is stable on any conventional aeroplane, since roll damping from the wing is always present.
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