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Piezo Gyro G 400
tail rotor: The leading edge of the tail rotor blades should now move to the left; if not,
reverse the tail rotor servo at the transmitter.
·
Check the direction of operation of the gyro (REV switch). Swing the tail boom to the
right: the leading edge of the tail rotor blades should now move to the left. If not, ope-
rate the „REV" switch on the Piezo Gyro G 400. Note: if you use the „REV" switch on
the gyro the change will not take effect until you switch the gyro off and then on again.
All stated directions are as seen from the tail of the model looking forward.
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 Piezo Gyro G
400 simultaneously 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 dange-
rous extent.
For initial familiarisation flights with the new gyro we suggest the following basic set-
tings:
·
Tail rotor servo travel (ATV):
approx. 70%
·
Gyro gain (ATV):
approx. 70%
4.2. Connecting and setting up the Piezo Gyro G 400 for „Heading Hold" mode with
gain adjustment from the transmitter
As already described, the gyro very effectively maintains the helicopter's tail boom positi-
on when in Heading Hold mode. The new mode offers the following advantages:
·
The beginner now has the chance to concentrate completely on the other basic func-
tions of the helicopter, because the tail always stays in the same position.
·
When practising cross-wind flying the tail rotor requires no control commands. The
model flies on a stable heading, with none of the usual weathercocking effect, i.e. the
tail boom has no tendency to turn under the influence of the wind. Admittedly this also
means that, in order to fly straight ahead, it is now necessary to use a slight stick
deflection to place the helicopter on the desired heading.
·
This mode is ideal for the 3D style of flying which has been gaining ground steadily over
the past few years, since the tail does not need to be controlled separately when the
helicopter is flying backwards. Once set, the helicopter's directional heading is main-
tained very effectively.
Important:
·
The Piezo Gyro G 400 detects and corrects the tiniest of deviations, which means that
it does not require assistance from a collective pitch -> tail rotor mixer (Revo-Mix). We
recommend that you switch this mixer off.
·
Conventional gyro systems usually feature electronic gyro suppression (Gyro-Sens.-
Mixer) which allows the model to fly high-speed pirouettes. This is not required with the
Piezo Gyro G 400, since the sensor signal is always over-ridden by any stick command.
The extent to which it is over-ridden is determined by the servo travel setting (ATV). For
this reason the suppression mixer (Gyro-Sens.) must always be switched out of circuit
when the Piezo Gyro G 400 is in use.
·
For the same reasons all the other mixer functions which affect the tail rotor (e.g.
swashplate -> tail rotor mixer) should also be switched off.
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No.
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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 dif-
ferences 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
linkage - 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 mechani-
cal 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 pro-
vides proportional control over the range 0 - 100%.
Note: In contrast to previous gyro systems, any reduction in the gain of the Piezo Gyro G
400 simultaneously 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 dange-
rous extent.
4.3. Connecting the Piezo Gyro G 400 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 Piezo Gyro G
400 simultaneously 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 dange-
rous extent.
Connect the Piezo Gyro G 400 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.
Piezo Gyro G 400
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No.
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