Definition
The property of an airplane that determines how its motion behaves over time after it has been disturbed from a steady flight condition. An airplane with positive dynamic stability returns to its original condition with oscillations that grow smaller and eventually die out. Neutral dynamic stability produces oscillations that continue at the same size, and negative dynamic stability produces oscillations that grow larger over time.
Plain English
It describes what happens to the airplane's wobble after a bump or control input. With good dynamic stability, the wobbles shrink and the airplane settles back to steady flight on its own.
Context Anchor
Seen in aircraft stability and handling discussions, especially when learning how an airplane responds after a disturbance in pitch, roll, or yaw.
Derivation
Dynamic comes from the Greek dynamis, meaning power or motion. Static stability is about the initial reaction to a disturbance; dynamic stability is about how that motion plays out over time.
Why Pilots Care
Good dynamic stability prevents oscillations from growing after turbulence or control inputs, reducing pilot workload and lowering the risk of loss of control.
Grounding Statement
Picture hitting a bump in turbulence: the nose pitches up and down a few times, each swing smaller than the last, until the airplane is steady again. That shrinking oscillation is positive dynamic stability at work.
Intuition Check
Dynamic stability does not mean the airplane is simply stable at one instant. It means whether the airplane’s motion after a disturbance dies out, stays the same, or grows.
Example Sentence 1
After encountering turbulence, the airplane's positive dynamic stability damped out the pitch oscillations within a few seconds.
Example Sentence 2
The instructor noted that the trainer's positive dynamic stability reduced the need for constant corrections during cross-country flight.