User manual

gyro suppression value".
Accordingly: at 0% gyro suppression, gyro gain is
constant for tail rotor control stick movement; at
50% suppression, gyro gain is reduced to half if the
assigned control is moved to the +50% position (as
shown here); and only at >150% suppression is gain
reduced to zero with the control at this position, well
before full tail rotor deflection.
Exemple:
+50 %
 Gyro gain 
left
Stick deflection tail rotor
centre right
Range of
transmitter
control 7
• Linear gyro suppression with reduced control travel,
e.g. -50% to +80% of full travel.
Gyro gain is smoothly variable within these control
limits. Here too, for purposes of illustration, we plot
gyro gain values in relation to tail rotor deflection for
various parameter values of gyro suppression.
Exemple:
+80 %
 Gyro gain 
left
Stick deflection tail rotor
centre right
Range of
transmitter
control 7
Adjusting the gyro sensor
To achieve the maximum possible level of stabilization
for the helicopter with the gyro along the vertical axis,
observe the following:
• The controls should have as little friction and "play"
as possible.
• There should be no "spring" in the control linkage.
• Use a strong and – in particular – a fast servo.
When the gyro sensor detects a model rotation, or a
corresponding corrective change to tail rotor thrust takes
effect, the further the gyro gain adjustor can be moved
without causing the tail of the model to start oscillating,
and the better the model's stability about its vertical axis.
If the response is slower, there is a risk that the model's
tail will start to oscillate even at low gyro gain settings.
Here, further reductions to gyro gain will need to be
made to eliminate the oscillation.
If the model is flying forward at high speed or hovering
in a powerful headwind, the net result of the stabilizing
effect of the vertical fin combined with the gyro may
also lead to an overreaction that once again manifests
itself through tail oscillation. To achieve optimum gyro
stabilization under all conditions, you can make use of
the option to adjust gyro gain from the transmitter using
a transmitter control assigned to input "7", in connection
with gyro suppression and/or the two settings on the
Gyro NEJ-120 BB.
Further notes on gyros with configurable multilevel gyro
gain (e. g. NEJ-120 BB)
Since you cannot specify the gyro gain from the
transmitter proportionally via the transmitter control, the
gyro's own control 1 must be used to set the (weaker)
gyro gain (e. g. for aerobatics) and control 2 must to
used to set the stronger gyro gain (e. g. for hovering ).
Even though a proportional control is used for control
function 7, only a switch-over between these two values
takes place and the setting is therefore not proportional.
You should therefore advance control 2 to the point
where the model is on the brink of oscillating when
hovering in calm conditions, and advance control 1 to
the point where the model does not oscillate with its
tail even when flying at maximum speed into a strong
headwind. Depending on the state of the weather and
the flight program planned, you can also switch the gyro
gain from the transmitter, possibly with gyro suppression
dependent on tail rotor deflection if required.
"Gyro Offset" line
NOTE:
An offset value entered in this option as well
as in the line "CH 7" of the display "CH5-9
CTRL" or "CH5-12 CTRL" of the menu
"D/R,EXP", page 173, add up! For the sake of clarity,
make sure to only enter or change an offset value in one
of the two options.
Most of the current gyro systems can be adjusted for
a smooth, proportional effect; you can also choose
between two different modes of action by the transmitter.
If the gyro that you are using also has one of these
options, the alternative offset setting enables both the
normal gyro gain and "heading lock mode" as well as
flying with maximum stabilization in normal, slow fights
within this selected mode, and reducing the gyro gain in
fast roundtrips and aerobatics.
You should accordingly take advantage of switching
flight phases to enter different settings in the "GYRO
OFFSET" line. Values between -125% and +125% are
possible, for example:
Gyro Gain
000% Gyro Suppression
Governor RATE
Governor ACT
000%
INH
050%
RES
DEC
INC
NORMAL
Starlet
BACK
S
Based on the these Q.Link-specific (offset) settings, the
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Helicopter model function menu - Gyro/Gover
S1006_mz-24.3.en.indd 187 17.12.2014 15:22:42