Discussion
In stability axes, which of these sign conventions is correct?
Answer: D
Static longitudinal stability requires \( C_{m_\alpha} < 0 \): an increase in incidence must produce a nose-down moment. Directional stability, by contrast, requires \( C_{n_\beta} > 0 \), and dihedral effect requires \( C_{l_\beta} < 0 \). Those three signs - negative, positive, negative - are worth memorising as a set, because two of them look inconsistent until you notice that a positive sideslip is from the right while a positive yawing moment is nose-right, so the aeroplane turns into the wind.
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