Discussion
Consider the following statements about high speed roll control:
1. Aileron reversal arises from wing twist.
2. Outboard ailerons are often locked out at high speed.
3. Inboard ailerons twist the wing more than outboard ones do.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
The first two are correct. Aileron reversal arises from wing twist cancelling the aileron's own lift change, and outboard ailerons are locked out at high speed for that reason.
The third reverses the comparison. Inboard ailerons twist the wing less, because the structure is deeper and torsionally stiffer near the root and the moment arm to the torsion box is shorter. That is precisely why roll control is moved inboard at high speed, and why the statement inverts the design logic.
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