AIRCRAFT STABILITY FOR BASIC
COURSE
By: Eng. Abd Elmonem Elmoselhy
The characteristic of an aircraft that causes
it to return to its original flight condition after
it has been disturbed.
Dynamic Stability
Usually, the goal of engineers is to create
dynamically stable aircraft.
When an aircraft is disturbed from the straight and level
flight, its static stability starts it back in the correct
direction; but it overshoots, and the corrective forces
are applied in the opposite direction.
The aircraft oscillates back and forth on both sides of
the correct condition, with each oscillation smaller than
the one before it.
Dynamic stability is the decreasing of
these restorative oscillations."
gradual dampening oscillations after a disturbance.
Each oscillation will be weaker than the previous until
the aircraft steadily returns to its original state.
the oscillations continue in the same motions following a
disturbance, neither increasing nor decreasing, causing the
aircraft to maintain constant deviation from its initial position.
amplified oscillations after a disturbance. The deviations from
the original state will grow progressively, and worsen without
corrective pilot intervention.