Discussion
An aeroplane sideslips 8 degrees and the fin's local sideslip is reduced to 6 degrees by sidewash. The sidewash factor is
Answer: B
Correct answer: 0.25
Sidewash is expressed as the fraction of the free-stream sideslip lost before the flow reaches the fin:
\[ \frac{d\sigma}{d\beta} = 1 - \frac{\beta_{\text{fin}}}{\beta} = 1 - \frac{6}{8} = 0.25 \]
So a quarter of the sideslip is washed out, and the fin's contribution is reduced by the factor \( (1 - 0.25) = 0.75 \). The distractor 0.75 is that retained fraction rather than the sidewash itself, and 1.33 is the ratio inverted. The effect is why a fin never delivers the stability its bare geometry would promise.
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