The bank synchro mounts with its rotor on the
isolate the gyro from its housing and the aircraft.
gyro gimbal pivot and its stator on the gyro case.
Thus, the aircraft can bank or pitch while the gyro
Thus, the synchro measures the displacement
remains vertical because of gyroscopic action
angle between the gimbal and the case. This is
(fig. 8-18). A pitch synchro, mounted on the
the bank displacement angle from the vertical
vertical gyro's pitch pivot, centinuously senses the
reference.
relative pitch angle between gyro and aircraft.
As the pitch attitude of the aircraft changes,
Similarly, a bank synchro, mounted on the
the gyro case and gimbal turn about the gyro
vertical gyro's bank pivot, continuously senses the
rotor. The pitch synchro rotor is held rigid in
relative bank angle between gyro and aircraft.
space by the gyro. This generates voltages in the
The gyro motor rotates at a speed of about
pitch synchro proportional to the aircraft's pitch
angle with respect to the surface of the earth.
prevents tilting and tumbling when the gyro motor
During changes in pitch attitude, the bank synchro
is idle and during the initial starting torque.
remains at null since the gyro gimbal is not free
Synchros mounted on the gyro detect motion
to rotate with respect to the case in pitch.
between the gyro, the gyro gimbal, and the gyro
Therefore, it tilts with the case.
case. A synchro generates a weak signal when its
As the bank attitude of the aircraft changes,
rotor is displaced from its stator. The pitch
the bank synchro stator turns about the bank
synchro mounts with its rotor on the gyro pivot
synchro rotor. The gimbal is held rigid in space
and its stator on the gyro gimbal. Thus, the
by the gyro because it is not free to rotate with
synchro measures the displacement angle between
respect to the gyro in bank. Thus, the bank
the gyro and the gimbal. This is the pitch
synchro generates voltages proportional to the
displacement angle from the vertical reference.
Figure 8-18.-Vertical pitch and roll reference.
8-16
