Discussion
A centre of gravity moves from 0.25 to 0.35 chord while the neutral point stays at 0.42. The static margin falls from
Answer: C
Correct answer: 0.17 to 0.07 chord
The static margin is the distance from the centre of gravity to the neutral point:
\[ K_n = h_n - h \]Before the shift \( K_n = 0.42 - 0.25 = 0.17 \); after it \( K_n = 0.42 - 0.35 = 0.07 \). The neutral point is a property of the aerodynamic layout and does not move when the loading changes, so the whole of the 0.10 chord shift comes out of the margin. At 0.07 chord the aeroplane is still stable but only just, and the stick forces would be noticeably light.
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