Discussion
Downwash changes at \( 0.35 \) per unit change of wing angle of attack. For a two degree change in aeroplane incidence, the tail's incidence changes by
Answer: B
The tail sees \( 2 \times (1 - 0.35) = 1.3 \) degrees of the change. Downwash therefore reduces the tail's contribution to stability by roughly a third in this case, which is why the derivative appears explicitly in the analysis.
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