Discussion
Match each augmentation loop with the derivative it effectively augments.
List I
A. Yaw rate to rudder
B. Sideslip to rudder
C. Roll rate to ailerons
List II
P. Roll damping
Q. Yaw damping
R. Directional stiffness
Select the correct match.
Answer: C
Rate feedback augments damping and displacement feedback augments stiffness, on whichever axis the signal and the surface share, so A-Q, B-R, C-P. The rule generalises: measure a rate and you add damping to that axis, measure a displacement and you add stiffness. It is the fastest way to reason about an unfamiliar control law, and it explains why a yaw damper does nothing for the spiral, which needs a bank-angle loop instead.
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