Order No. 4451 Fuselage kit Order No. 4451.K ... - Graupner

UNI-STAR 60
8. Gyro adjustment
Gyro systems damp out unwanted rotational movements around the vertical (yaw) axis of the
model helicopter. They do this by detecting the unwanted motion and injecting a
compensatory signal into the tail rotor control system, and in order to achieve this effect the
gyro electronics are connected between the tail rotor servo and the receiver. Many gyro
systems also allow you to set two different values for gyro effect and switch between them
from the transmitter via a supplementary channel. Some gyros even offer proportional
control. The extra channel is controlled via a proportional slider or rotary knob, or a switch,
depending on the gyro system.
If your gyro system features an adjustor box with two rotary pots for two fixed settings, and
you can switch between them from the transmitter, it is best to set one adjustor
approximately to centre (50%), and the other to 25%. If the gyro system provides
proportional control between the two set values, then the one pot should be set to "0", the
other to about 80%.
If you have a gyro system whose effect cannot be adjusted from the transmitter, i.e. there is
only a single adjustor on the gyro electronics itself, the pot should be set to 50%
effectiveness as a starting point.
Check that the direction of the gyro’s compensatory action is correct, i.e. that it responds to a
movement of the tail boom with a tail rotor response in the opposite direction. If this is not the
case, any yaw movement of the model would be amplified by the gyro! Most gyro systems
are fitted with a change-over switch which reverses its direction, and this must then be
moved to the appropriate position. However, some systems have no such switch, and in this
case the solution is to mount the gyro inverted.
One factor which all gyro systems have in common is that flight testing is necessary in order
to establish the optimum settings, as so many different influences affect the settings.
The aim of the gyro adjustment process is to achieve as high a level of gyro stabilisation as
possible, without the gyro causing the tail boom to oscillate.
14