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Rotational Motion

Stability and Control. 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:.

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Rotational Motion

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  1. Stability and Control RotationalMotion

  2. 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: An aircraft with static instability uniformlydeparts from an 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.

  3. Longitudinal Static Stability cg Time = 0.0 Tail Force Aircraft encounters gust Nose pitches up Resulting Motion Tail Force Time = 1.0 Airflow Direction Time = 2.0 Tail Force

  4. Lateral Static Stability Time = 0.0 Lift Vectors Dihedral Angle View Downstream Weight Aircraft rolls slightly to the right Time = 1.0 Resulting Motion Weight Lift Vectors Dihedral Angle Time = 2.0 Weight

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