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# Stability

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### Stability

1. 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.<br />Maneuverability: Ability of an aircraft to be moved, with pilot input.<br />Controllability: How easily an aircraft moves, with pilot input.<br />Static Stability: Not moving. The ability of an object to return to its equilibrium state after being disturbed<br />Dynamic Stability: In flight. The way the object moves after being disturbed<br />Positive Stability: Disruption works itself out, and eventually stops.<br />Negative Stability: Disruption gets worse as time goes on.<br />Neutral Stability: Disruption neither increases nor decreases over time.<br />Positive Dynamic: How it acts after it’s been disrupted.<br />Types of Stability:<br /><ul><li>Longitudinal
2. 2. Around the lateral axis, therefore stability of the longitudinal axis.
3. 3. Pitch stability.
4. 4. Horizontal Stabilizer mounted at slight downward angle, to help recover from stall naturally.
5. 5. Lateral
6. 6. Around the longitudinal axis, therefore, stability of the lateral axis.
7. 7. Roll stability.
8. 8. Controlled by wing dihedral. (Upward angle of wing, from root to tip)
9. 9. High wing generally have less dihedral than low wing.
10. 10. On a high wing, the CG is below the wing; on a low wing, the CG is above the wing.
11. 11. As wing moves down, relative wind comes from lower angle, which increases angle of attack.
12. 12. In a roll, downward wing gets higher angle of attack, which creates more lift. Opposite on up wing.
13. 13. Directional Stability
14. 14. Around the vertical axis
15. 15. Yaw stability
16. 16. To be directionally stable, aircraft must have more surface area behind the CG than in front of it. (Think: Weathervane)
17. 17. Controlled by vertical stabilizer
18. 18. Wing sweepback affects directional stability. (High speed aircraft)
19. 19. Dutch Roll-Roll and yaw combined, side to side.
20. 20. Yaw Dampers on rudder to combat this.