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To use the system follow the procedure as described under 4.1.
· Activate „Heading Hold" mode (slider 5 to the appropriate end-point).
· Watch the tail rotor: it will tend to swing away in one direction in response to minor diffe-
rences in the radio control system's neutral signal.
· Adjust the tail rotor trim until the tail rotor and the servo are stationary (TIP: if possible
reduce the trim travel electronically (e.g. TRIM RATE 30 - 40%) to provide finer control of
the neutral setting.
· Activate „Normal" mode.
· Set the model to hover and turn the nose into wind.
· If the model swings around the vertical axis at the hover, land and adjust the tail rotor lin-
kage - but don't move the trim.
· You may need to repeat this procedure several times.
· Once the model hovers without any natural tendency to swing, the model's mechanical
system is correctly adjusted in relation to the electronic system.
Now you can try a circuit using „Normal" or „Heading Hold" mode. All further adjustments
such as maximum gyro gain and the optimum travel setting for the tail rotor servo (ATV)
(max. yaw rate) must be found during the test flying procedure.
· You can now adjust the sensitivity (gain) of the gyro from the transmitter. Slider 5 provides
proportional control over the range 0 - 100%.
Note: In contrast to previous gyro systems, any reduction in the gain of the 3-D gyro simul-
taneously reduces servo travel, since lower gyro sensitivity calls for less tail rotor travel in
order to obtain the same control response. The gyro also features an exponential control
characteristic curve. Values below 30% are not of practical usefulness and should not be
set in any case because they would reduce the tail rotor control travel to a dangerous
extent.
4.3. Connecting the 3-D gyro in „Normal mode" with manual gain adjustment on the
gyro
If your radio control system has relatively few channels you may well find that no vacant
channel is available for remote gyro gain adjustment. If this is the case simply leave the
„Aux" connector (attached to the gyro) unconnected. Gyro sensitivity can now be adjusted
proportionally within the range 0 - 100 % by rotating the adjustor marked „Gain" on the gyro.
Turn it clockwise to increase gain, and anti-clockwise to reduce it.
Note: In contrast to previous gyro systems, any reduction in the gain of the 3-D gyro simul-
taneously reduces servo travel, since lower gyro sensitivity calls for less tail rotor travel in
order to obtain the same control response. The gyro also features an exponential control
characteristic curve. Values below 30% are not of practical usefulness and should not be
set in any case because they would reduce the tail rotor control travel to a dangerous
extent.
Connect the 3-D gyro between the tail rotor servo and the receiver as shown in Sketch 1.
In this variant the connector marked „Aux" is not connected. If the auxiliary channel is not
connected to the radio control system, the gyro automatically works in Normal mode.
In this case it is not possible to activate Heading Hold mode.
3D GYRO english
15
No.
8065
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