Discussion
Which quantity is a mass property rather than a derivative?
Answer: B
Pitching inertia is a mass property, obtained from the mass breakdown or by swinging the aeroplane, and it divides every moment derivative in the conversion to dimensional form. The other three are aerodynamic derivatives. The distinction is practical: inertias change with loading and fuel state, while derivatives change with flight condition and configuration, so the two are tabulated separately and combined only at the point of forming the equations of motion.
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