Gyro (Gyro Mixer); Tail (Tail Rotor Mixer) - Multiplex Royal SX 9 Instructions Manual

Gyro (Gyro mixer)

16.2.2.
The gyro mixer included in the ROYAL SX can be
used for both fixed-wing model aircraft and helicop-
ters, provided that the gyro features an input for gain
adjustment from the transmitter.
The gyro mixer of the ROYAL SX provides a means
of setting the optimum stabilisation level of any model
axis under all flying conditions, using either simple gy-
ros or modern Heading gyros. The gyro mixer of the
ROYAL SX can be set to suit the two gyro types
Damping and Heading:
In the case of model helicopters it is assumed that the
vertical axis (yaw / tail rotor) is stabilised using a gyro
system.
The following table lists the characteristics of the two
gyro systems in common use today:
Damping gyro
(normal gyro)
The gyro brakes the rotational
movement of the model
around the axis to which the
stabilisation is applied.
Gain setting range
0% ... 100%:
100% (max.)
50%
0% (OFF)
Heading gyro
(heading-lock gyro)
The gyro brakes the rotational
movement of the model around
the axis to which the stabilisa-
tion is applied, and also returns
the model to its initial heading.
The prefix to the gain setting
determines whether the gyro
works in "damping" mode or
"heading-lock" mode.
Gain setting range
-100% ... +100%:
Max damping
effect
+100%
0% (OFF)
-100%
Max. heading
effect
What does the menu show?
Type of Gyro Damping
Control — E
Suppression
a. Type of Gyro
Heading or Damping can be selected.
nd
b. 2 line gain = 0%
If Control appears in this line, the gain is set to
0%. In this case you will see on the right of the
screen the code letter for the transmitter control
which you have assigned to the Gyro function in
the sub-menu Setup, Assignment, Controls
(e.g. Slider E).
nd
line gain ≠ 0%
c. 2
- for Damping gyro this means:
Adjustment range +1% to +100%
- for Heading gyro this means:
Adjustment range -100% to +100%
Heading indicator from -100% to -1%
Damping indicator from +1% to +100%.
d. Suppression
Gyro gain can be reduced automatically when con-
trol commands are applied. In the case of model
helicopters this occurs when the Yaw stick is
moved, for fixed-wing model aircraft when the Ai-
leron stick is operated.
Adjustment range OFF to 200%
At the 200% setting, gyro effect is reduced to
0% when the stick is only at half of full travel.
Note:
Many gyro systems feature their own suppression
function. In this case the transmitter's gyro suppression
function should generally be disabled (Suppression
OFF). Please refer to the appropriate notes in the
operating instructions supplied with your gyro system.
!
Caution!
Before operating the model helicopter for the first
time, do ensure that the gyro is working correctly,
and is set up to counteract any unwanted yawing
movement. If the gyro is set up incorrectly, it will
amplify the unwanted movement, and the model
will be rendered uncontrollable.

TAIL (tail rotor mixer)

16.2.3.
The ROYAL SX's TAIL mixer conceals the function
"static tail rotor compensation", which is also some-
times known as REVO-MIX (revolution mixer). The
TAIL mixer always appears automatically in the main
menu Mixer when you set up a model based on the
model templates HELImech or HELIccpm.
When a helicopter makes the transition from the hover
into a climb or descent, the torque which the tail rotor
has to compensate becomes larger or smaller, with
the result that the helicopter yaws in one direction.
Once set up correctly, the TAIL mixer compensates
for these torque fluctuations, and prevents the model
yawing. It also eases the task of the gyro system, so
that you can set higher gyro gain and thereby obtain
very good tail rotor stabilisation. Four parameters are
required for this.
Manual
OFF
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