Stability
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Stability

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Stability Document Transcript

  • 1. Stability: Ability of aircraft to return to it’s starting point/steady state conditions/etc. without pilot input. Don’t want too stable, because then it’s hard to maneuver.
    Maneuverability: Ability of an aircraft to be moved, with pilot input.
    Controllability: How easily an aircraft moves, with pilot input.
    Static Stability: Not moving. The ability of an object to return to its equilibrium state after being disturbed
    Dynamic Stability: In flight. The way the object moves after being disturbed
    Positive Stability: Disruption works itself out, and eventually stops.
    Negative Stability: Disruption gets worse as time goes on.
    Neutral Stability: Disruption neither increases nor decreases over time.
    Positive Dynamic: How it acts after it’s been disrupted.
    Types of Stability:
    • Longitudinal
    • 2. Around the lateral axis, therefore stability of the longitudinal axis.
    • 3. Pitch stability.
    • 4. Horizontal Stabilizer mounted at slight downward angle, to help recover from stall naturally.
    • 5. Lateral
    • 6. Around the longitudinal axis, therefore, stability of the lateral axis.
    • 7. Roll stability.
    • 8. Controlled by wing dihedral. (Upward angle of wing, from root to tip)
    • 9. High wing generally have less dihedral than low wing.
    • 10. On a high wing, the CG is below the wing; on a low wing, the CG is above the wing.
    • 11. As wing moves down, relative wind comes from lower angle, which increases angle of attack.
    • 12. In a roll, downward wing gets higher angle of attack, which creates more lift. Opposite on up wing.
    • 13. Directional Stability
    • 14. Around the vertical axis
    • 15. Yaw stability
    • 16. To be directionally stable, aircraft must have more surface area behind the CG than in front of it. (Think: Weathervane)
    • 17. Controlled by vertical stabilizer
    • 18. Wing sweepback affects directional stability. (High speed aircraft)
    • 19. Dutch Roll-Roll and yaw combined, side to side.
    • 20. Yaw Dampers on rudder to combat this.