Discussion
Flight test measures of lateral behaviour.
| Measurement | What it reveals |
|---|---|
| Aileron held per degree of steady sideslip | Strength of the dihedral effect |
| Time to bank through a given angle | Roll control power |
| Cycles to damp the Dutch roll | Balance between the lateral axes |
| Time to double bank angle undisturbed | Spiral mode behaviour |
Which measurement most directly tests the derivative that defines lateral stability?
Answer: A
Correct answer: Aileron held per degree of steady sideslip
Lateral stability is defined by \( C_{l\beta} \), the rolling moment produced by sideslip, so the test that measures it directly is the steady sideslip: the aileron deflection needed to hold the wings level against a given slip is a measure of the rolling moment the slip is producing.
The other three measure related but different things - roll control power, the balance between the lateral and directional axes, and the spiral mode. Each depends on \( C_{l\beta} \) among other quantities, but none isolates it.
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