Discussion
Roll control devices and their yaw characteristics.
| Device | Adverse yaw | Notes |
|---|---|---|
| Plain ailerons | Pronounced | Simplest arrangement |
| Differential ailerons | Reduced | More up than down travel |
| Frise ailerons | Reduced | Projecting nose adds drag |
| Spoilers | Favourable | Drag added inside the turn |
Why do spoilers reverse the sign of the yaw?
Answer: C
Correct answer: They add drag inside the turn
A spoiler is raised on the wing that is to descend - the inside of the turn - and it works by destroying lift, which necessarily adds drag at the same place.
Drag on the inside yaws the nose into the turn, the opposite of the aileron case, where the extra induced drag falls on the rising outer wing. Note that spoilers reduce lift on the descending wing rather than adding it, and they involve the rudder not at all; the reversal of sign follows entirely from which wing carries the extra drag.
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