The gyro wheel rotates about a beam axis. Its supporting
gimbal pivots about an upright axis and is centered by a pair
of springs. A constant velocity air jet is applied to the
serration in the rim of the gyro wheel, which causes it to
rotate at a constant speed. Any movement of the vessel about
the roll axis, will cause a corresponding precession of the
gyro.
b-Rotary Valve
The rotary valve is mechanically coupled to the gyro and
convert the mechanical deflection of the gyro into a
pneumatic signal equivalent to the magnitude of the
deflection of the gyro. The rotary valve is constantly
supplied with 100 psi air pressure. When the gyro is in its
central position, the outputs from the rotary valve are
equal. As the gyro moves, to either direction, the linkage
transmit the movement to the rotary valve and causes its
spindle to rotate. Thus, increasing the pressure output on
one side and reducing the output on the other side.
c-Amplifiers
The amplifiers allow a large amount of air ( at the
prescribed pressure dictated by the rotary valve ) to pass
through to the driving mechanism, thus, causing the fin to be
activated. A pressure gauge is mounted on the amplifier to
indicate the pressure going through.
d-Distribution Block
The purpose of this unit is to distribute the incoming air
from the reservoir to the various parts of the control unit.
It also distributes the output from the amplifiers to the
driving mechanism of the fins.
e-Gyro Pressure Regulator
This controls the pressure of the air supply to the gyro
wheel and is used to control its rotation speed and
consequently determines the sensitivity of the system.
