It seems that the problem is going to be related to the AFCS. Discarded fuel tanks
Terms; Stable flight, (some adjust with vertical trim), only AFCS "engage" (altitud and heading selection OFF), air speed; all range.
1. You start a quick turn, you can feel like the system wants to "return" the plane to the starting position.... ummm not sure if it´s OK (remember; altitud and heading selection OFF)
2. You keep forcing the turn and ... bingo! the rolling begins. The tail rudder moves itself (AFCS system ¿?). I release the stick but it seems that the AFCS is going crazy putting the plane into a wild spin.
3. You regain control (stick) but the plane keeps trying to turn on itself uncontrollably.
I have some really funny tacview files.
In reality, I doubt that the AFCS with an intentional change of direction or altitude, blocked due to this effect.
CONTROL STICK STEERING (CSS) MODE
The CSS mode provides for longitudinal and lateral control of
the aircraft through the AFCS by pilot movement of the stick as
in normal flight. This mode is engaged regardless of other
modes selected. Preselect heading and altitude hold modes are
disengaged by use of CSS and they must be re-engaged to be
used again. The AFCS reverts from CSS mode to either attitude
hold or heading hold mode when pilot force on the control stick
is reduced below 2 pounds. The aircraft is controllable in all
attitude in CSS throughout the AFCS flight envelope, which is
4±½ positive-g, 1½±½ negative-g, and one-half aileron
deflection left or right. If these limits are exceeded, the AFCS
disengages.