Rotational Motion Stability and Control
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Rotational Motion
Stability and Control
An aircraft is stable if it returns to its initial equilibrium flight conditions when it is perturbed. There are two main types of aircraft instability:
Stability and Control
An aircraft with static instability uniformly departs froman equilibrium condition
An aircraft with dynamic instability oscillates about the equilibrium condition with increasing amplitude.
There are two modes of aircraft control: one moves the aircraft between equilibrium states, the other takes the aircraft into a non-equilibrium (accelerating) state. Control is directly opposed to stability.
Time = 0.0
Time = 1.0
Time = 2.0
Aircraft encounters gust Nose pitches up
cg
Tail Force
Airflow Direction
Longitudinal Static Stability
Tail Force
Tail Force
Resulting Motion
Lateral Static Stability
Resulting Motion
Weight
Dihedral Angle
Lift Vectors
Weight
Aircraft rolls slightly to the right
View Downstream
Time = 0.0
Time = 1.0
Time = 2.0 Dihedral Angle
Lift Vectors
Weight
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