Discussion
Contributions to the yawing moment derivative.
| Component | Contribution | Stabilising |
|---|---|---|
| Fin | Plus 0.14 | Yes |
| Fuselage | Minus 0.05 | No |
| Tractor propeller | Minus 0.02 | No |
| Total | Plus 0.07 | Yes |
What does the table establish about the fin's sizing?
Answer: A
The two forward contributions together push towards instability, and only the fin's larger positive value leaves a stable total. Anything that increases those forward contributions demands a larger fin in compensation.
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