FeiYu Tech FY-91Q - Manual (Page 3)

But if the value is too high, the aircraft can experience oscillations
during flight.
(3) Stability Stability Stability
Stability
Coefficient Coefficient Coefficient
Coefficient
Stability Coefficient controls the degree of angular rate
convergence when the airframe moves vertically (Z axis).
This parameter prevents movement of the aircraft along this Z
axis, especially during changes in aircraft heading.
If the value is too small, the airframe will move in pitch and roll
axis, resulting in aircraft instability.
If the parameter value is too high, oscillation will occur.
3. 3. 3.
3.
Position Position Position
Position
and and and
and
Height Height Height
Height
Control Control Control
Control
(1) Letter Letter Letter
Letter
X X X
X
and and and
and
Y Y Y
Y
Letter X and Y respectively represent the degree of stability and
leveling control during forward and backward, left and right flight
path.
(2) Letter Letter Letter
Letter
P P P
P
Letter P represents the degree of movement control given by the
controller when there is a deviation between airframe position and
objective hovering position.
If the value is too small, hovering position recovery will be too slow
resulting in instability during a hover procedure.
If the value is too high, oscillations will occur when in the
hovering position.
(3) Letter Letter Letter
Letter
III
I
Letter I represents the degree of control to move in unit time given
by the controller when there is a deviation between airframe position
and objective hovering position.
If the value is too small, there will be a deviation between the
actual airframe position and objective hovering position, making it
more difficult to reach the objective hovering position.
If the value is too large, oscillations will easily occur during
aircraft hovering.