a) Selecting the connected servo
In order to fully exploit the precision of this gyro, use a high-quality, high-speed, top-class servo. As a rule,
you should use a digital servo, which can be controlled a lot faster than conventional analogue servos. In
order to use high-quality analogue servos with this gyro, the gyro is equipped with a servo selection switch.
The servo selection switch (15) is the upper micro switch in the middle
of the control panel.
If the DS switch (digital servo switch) is in the "ON" position, only
digital servos may be operated on the gyro.
Important information!
If analogue servos are connected when the switch is in
this position, they may be damaged by the high control
frequency.
When using analogue servos, the DS switch must be in
the "OFF" position.
Caution!
As the slide switch and the settings regulator of this gyro are very small, you should make all
settings very carefully using the supplied screwdriver (see illustration 1, position 6) only.
b) Initialisation of the gyro
The gyro must be initialised to function properly. This internal
calibration is carried out automatically after switching on the receiver
and takes approx. 2-3 seconds.
The LED display (16) flashes quickly to signal initialisation. During
this time, the model and the gyro must not be moved or turned.
Depending on the operating mode, the LED is lit continuously once
initialisation is terminated (AVCS mode) or it remains dark (normal
mode).
Apart from the initialisation, the LED also indicates additional operating
states of the gyro:
d) Checking the rotational direction of the servo
The rotational direction of the tail servo lever depends on
the model helicopter type and the rotational direction of
the tail rotor (small arrow).
If the control stick for the tail function is moved to the left
on the transmitter, the tail servo must control the tail rotor
so that the tail is turned to the right and the fuselage end
to the left as seen from above (illustration 8 A).
If the control stick for the tail function is moved to the right
on the transmitter, the tail servo must control the tail rotor
so that the tail is turned to the left and the fuselage end
to the right as seen from above (illustration 8 B).
If the tail servo responds exactly opposite to illustration 8, the rotational direction of the tail servo on the
transmitter has to be changed (reverse function).
For easier understanding, the inclination of the tail rotor necessary to balance the main rotor
torque has not been taken into account in illustration 8.
e) Setting the effective direction of the gyro
For the gyro to prevent the model helicopter from turning around the vertical axis (rotor shaft), it must
constantly give a tail servo control command to generate the opposite steering moment.
First switch on the transmitter, and then switch on the model. Switch the gyro to normal mode after
initialisation.
Caution!
If you use an electric model helicopter, disconnect the engine from the regulator in order to
prevent uncontrolled start-up of the rotors.
If the tail is now pushed to the left by hand as seen from
above, the tail servo must perform a control movement to
turn the tail back to the right. The rotary motion of the tail
servo must be in the same direction as when the control
stick for the tail function is moved to the left (illustration
9 A) on the transmitter.
If the tail is now pushed to the right by hand as seen from
above, the tail servo must perform a control movement to
turn the tail back to the left.
The rotary motion of the tail servo must be in the same
direction as when the control stick for the tail function is
moved to the right (illustration 9 B) on the transmitter.
If the rotational direction generated by the gyro for the tail servo is exactly opposite to illustration 9, the
rotational direction of the gyro can be changed. However, the toggle switch only responds to the servo
pulses generated by the gyro. The control pulses emitted by the transmitter and transferred by the receiver
to the tail servo via the gyro are not affected.
The switch to set the rotational direction of the servo (17) is the lower
micro switch in the middle of the control panel.
If needed, you can switch the rotational direction from NOR (normal)
to REV (reverse).
Use the small adjustment screwdriver (see ill. 1, pos. 6) to set the DIP
switch.
f) Setting maximum tail servo throw
To prevent the tail servo from being mechanically obstructed or limited when the control stick on the
transmitter is pushed all the way, maximum servo travel can be limited via a control dial.
Please note that these settings can only be made after the correct basic settings of the tail rotor control rods
have been made.
Move the control stick for the tail function to the right and left end
position alternately and set the "LIMIT" (18) control dial to achieve the
biggest possible regulating distance of the tail rotor. Note that neither
the servo nor the control rods must be obstructed in their movement.
If the control dial is turned to the right, servo throw increases.
If the control dial is turned to the left, servo throw decreases.
Use the small adjustment screwdriver to make the settings (see ill. 1,
pos. 6).
MC 800
DELAY
LIMIT
OFF
ON
NOR
REV
DIR
DS
0
25
50
75
100
60
80
100
120
140
GYRO
AVCS
-
15
Figure 5
MC 800
DELAY
LIMIT
OFF
ON
NOR
REV
DIR
DS
0
25
50
75
100
60
80
100
120
140
GYRO
AVCS
-
16
Figure 6
0%
100%
100%
0%
0%
100%
100%
50%
50%
A
VCS-Modus
Normal-Modus
50%
50%
LINEAR
Figure 7
A
B
Figure 8
A
B
Figure 9
MC 800
DELAY
LIMIT
OFF
ON
NOR
REV
DIR
DS
0
25
50
75
100
60
80
100
120
140
GYRO
AVCS
-
17
Figure 10
MC 800
DELAY
LIMIT
OFF
ON
NOR
REV
DIR
DS
0
25
50
75
100
60
80
100
120
140
GYRO
AVCS
18
-
Figure 11
The LED flashes at short intervals
The LED is lit permanently
The LED is not lit although the gyro is
in operation
The LED flashes at long intervals
The LED flashes with interruptions
The LED flashes twice rhythmically
The gyro starts initializing immediately when it is switched on.
The gyro is in AVCS mode.
The gyro is in normal mode.
The gyro receives no control signal for the tail servo. The
transmitter not in operation or the connection to the receiver
is not correct.
The gyro could not initialise the correct neutral position of the
servo or the signals received in AVCS mode are not in
accordance with the neutral position saved in the gyro. Switch
the transmitter to AVCS mode and put the gyro in operation
again.
In AVCS mode, the input signal differs from the saved neutral
position. This flash signal appears when the control stick is
moved or the position of the trim lever for the tail function has
been changed.
c) Setting gyro sensitivity
The best way to set gyro sensitivity between 0 - 100% is using the slider (on the transmitter). At 0% the
stabilising effect of the gyro is deactivated and at 100% the highest gyro sensitivity is achieved. Now even
minimal direction changes of the gyro are sufficient to generate big corrective throws at the connected
servo.
The slider on the transmitter sets gyro sensitivity and the
operating mode. For this reason, the centre position of
the slider (50%) corresponds to 0% gyro sensitivity.
Depending on the control direction on the slider, the
sensitivity of the gyro is increased in normal or in AVCS
mode. The two end positions of the slider (0% or 100%)
represent maximum gyro sensitivity of 100%.
At 0 - 50%, the gyro works in normal mode. At 50 - 100%,
the gyro works in AVCS mode.
Instead of the slider, a toggle switch can be used to
select the operating mode. In this case, the set values
required for the transmitter must be programmed in the
ATV menu (slider settings).
In connection with a flight mode switch, you can programme individual gyro sensitivity values for hovering
flight, sightseeing flight and artistic flight.
To check whether the gyro is in the correct mode according to the slider setting, switch on the
transmitter first. Then switch on the receiver with gyro and connected servo. The slider on the
transmitter should be set so that the gyro works at about 75% sensitivity in normal mode. The
slider is at approx. 12.5%.
Caution!
If you use an electric model helicopter, disconnect the engine from the regulator in order to
prevent uncontrolled start-up of the rotors.
If the tail of the model helicopter is quickly turned to the side now, the servo has to perform a turning.
If the servo lever returns to centre position (neural position) immediately after every manual turning
movement, the gyro operates in normal mode.
If the servo lever only returns to centre position (neutral position) if the tail was turned back to its original
position, the gyro operates in AVCS mode. In this case, change the functional direction of the slider in the
reverse menu of the transmitter.
Recommendation:
The necessary gyro sensitivity setting for the first flight greatly depends on the model and the servo used.
The higher the quality of the connected servo and the faster its speed, the greater the maximum gyro
sensitivity. For the first flight you should set a sensitivity value of approx. 75%.
