Behavior of a liquid ballistic during speed or course change

Behavior of a liquid ballistic during speed or course change

When vessel adjust course or speed, horizontal acceleration is produced. In gravity control gyro, horizontal acceleration will produce top heavy bottom heavy effect. So, North end of spin axis will precess.
The precession of North end of spin axis is called Ballistic Deflection.

Ballistic Deflection will occur during manoeuvre.
Manoeuvre start – Ballistic Deflection start.
Manoeuvre finish – Ballistic Deflection finish.

When speed is increased in a N’ly direction – south heaviness will cause westerly precession.
But westerly precession is in the same direction as the change in speed error.
So, Ballistic Deflection = Change in speed error.