Discussion
Match each device in List I with how it treats adverse yaw in List II.
List I
A. Plain ailerons
B. Differential ailerons
C. Frise ailerons
D. Spoilers
List II
1. Produce pronounced adverse yaw
2. Reduce it by deflecting further up than down
3. Reduce it with a projecting nose on the up going surface
4. Reverse it, adding drag inside the turn
Select the correct match.
Answer: C
Correct answer: A-1, B-2, C-3, D-4
The four form a ladder from worst to best. Plain ailerons with equal travel produce pronounced adverse yaw, doing nothing about the drag imbalance.
Differential ailerons reduce it by deflecting further up than down, limiting the induced drag added on the descending side. Frise ailerons reduce it by projecting the nose of the up-going surface into the flow, adding profile drag there. Spoilers reverse the sign altogether by adding drag inside the turn. Each step treats the same imbalance more aggressively.
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