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Piezo Gyro G 400
3. Installation
Important: all gyro systems based on piezo sensors are vulnerable to vibration, and if your
model suffers from excessive vibration you will not obtain satisfactory results with any
piezo-gyro. However, you can be sure of obtaining good results by mounting the gyro unit
in your model using the foam plastic damper pads supplied. We also recommend the 3.2
mm thick double-sided foam tape made by 3M (robbe Order No. 5014). To avoid disap-
pointment we strongly recommend that you pay particular attention to the elimination of
vibration in your model.
Apply one of the self-adhesive foam strips to the underside of the gyro case. Install the
case in a low-vibration location in the model (e.g. in the dome under the collective pitch
servo of a Futura). The gyro must be orientated in such a way that the axis to be stabilised
runs vertically through the gyro (see Sketch 3). The installation position is non-critical, and
can be close to the rotor shaft or in the front servo structure. The only really important point
is that the Piezo Gyro G 400 is well protected from vibration.
Stabilisation of the vertical axis
Stabilisation of the longitudinal axis
Stabilisation of the lateral axis
Sketch 3
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No.
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4. Connecting the gyro system, using the system for the first time
Note: The manual „gain" adjustor is switched out of circuit if you connect the Aux chan-
nel to the receiver.
4.1. Connecting the Piezo Gyro G 400 and setting it up for „Normal" mode with gyro
gain control from the transmitter
In this mode the tail rotor is stabilised in the same way as with a conventional piezo-gyro
system. This mode is suitable for normal flying and aerobatic practice. In contrast to
Heading Hold mode (described later), the tail boom of the model will be affected by the
wind and will tend to „weathercock".
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.
swash-plate -> tail rotor mixer) should also be switched off.
Connect the Piezo Gyro G 400 between the tail rotor servo and the receiver as shown in
Sketch 1, and connect the „Aux" connector to a vacant slider channel (e.g. Channel 5).
·
Switch on the transmitter.
·
Switch on the receiver.
·
Leave the model and the Piezo Gyro G 400 untouched for about 10 seconds while
the Piezo Gyro G 400 carries out its zero calibration process.
·
Process complete -> tail rotor servo runs to starting position, red „Ready" LED on
Piezo Gyro G 400 lights up.
·
If you move the model too soon, or the monitor LED flashes, you must re-initialise the
gyro by switching the receiver power supply off and then on again.
·
Move the channel 5 slider to one end-point.
·
Move the tail rotor stick to one end-point and release it.
·
If the servo runs back to its original position, the gyro is in -> Normal mode.
·
If the servo stays in the „end-point" position, the gyro is in Heading Hold mode. Move
slider 5 to the opposite end-point.
·
Set the tail rotor trim to centre.
·
Fit the output arm on the tail rotor servo in such a way that the arm is exactly at 90° to
the pushrod (or as close as possible to 90°).
·
Connect the pushrod to the outermost hole at the tail rotor gearbox.
·
Move the tail rotor stick to full travel.
·
Connect the pushrod to one of the outer holes in the servo output arm. Aim for maxi-
mum linear pushrod movement, with the proviso that the linkage must not stall the
servo (mechanical obstruction) at full travel.
·
Check the direction of servo travel. Move the tail rotor stick to the right and watch the
Piezo Gyro G 400
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