Discussion
Why does the derivative set for a helicopter or a tilt-rotor need more care than for a fixed-wing aeroplane?
Answer: B
The rotor is a lightly damped dynamic system in its own right, so the coupling between rotor and fuselage matters and the assumption of quasi-steady aerodynamics is much weaker. Rotorcraft models therefore carry rotor states explicitly rather than folding them into a fixed-wing style derivative set. Derivatives do exist and are used, linearisation is still possible about a trim point, and reference areas are defined by convention as usual.
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