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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 channel
to the receiver.
4.1. Connecting the 3-D gyro and setting it up for „Normal" mode with gyro gain con-
trol 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 3-D gyro 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
3D-gyro, 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 3-D
gyro 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 3-D gyro 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 3-D gyro untouched for about 10 seconds while the 3-D gyro
carries out its zero calibration process.
· Process complete -> tail rotor servo runs to starting position, red „Ready" LED on 3-D
gyro 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 sli-
der 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 maximum
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 tail
3D GYRO english
13
No.
8065
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