PROG MIX – PROGRAMMABLE MIXERS
STANDARD PROGRAMMABLE MIXER – Example: DOWN ELEVATOR AT IDLE
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A-41
The X9503 2.4 System provides 4 Standard
programmable mixers (PROG.MIX3 - PROG.MIX6) and 2
Multi-Point programmable mixers (PROG.MIX1 & PROG.
MIX2). Mixing occurs when the pilot moves a stick,
switch or lever on the Master channel and the transmitter
generates an input for the Slave channel. The Slave’s input
is based on the pilot’s input to the Master channel and the
parameter defined in the programmable mixer.
You can use programmable mixers whenever you want
a channel to react or move (Slave) by providing input
to another channel (Master), or to move a channel by
moving a switch or lever. They are typically used to
compensate for deficiencies in aircraft design/setup, such
as eliminating pitch- and roll-coupling in knife-edge
flight, and to activate special aircraft functions like smoke
systems, speed brakes, bomb drops, idle-up, etc.
Multi-Point Mixing provides the ability to define a
customized “curve” of travel that the Slave channel will
follow as it reacts to the Master channel. It is different
from Normal Mixing in the sense that Normal Mixing
results in a linear movement of the Slave channel in
relation to the Master. With Multi-Point Mixing there are 7
points (including endpoints) along the travel of the Master
channel that can be adjusted to control the action of the
Slave channel (more or less travel in the same/opposite
direction) providing the ability to deviate from a linear
mixing action.
Mixes are programmable, allowing any of the 9 channels
to be Master, Slave or both. Additionally there are 4
options for Master channels that begin with a “#” (pound
sign), these Master channels are origin type mixes. These
include #THR, #AIL, #ELE, and #RUD. Origin mixing
bypasses any other mixing that might affect that channel
such as throttle curves or other programming and uses
the stick position only to control the mix. Also the Master
channel can be assigned to one of the two digital rocker
switches, levers, or button. If dual functions have been
activated in the device select function, it is possible for
the Slave channel to be assigned to channels such as
AILV, FPRN, FROL, and RUDV. These functions allow
the ailerons to be moved as flaps, flaps to be moved as
ailerons, elevators to be moved as ailerons, rudders to
be moved as speed brakes either both in or both out, or
similar functions.
Some examples of how programmable mixers might be
used include but are certainly not limited to:
•
Eliminate Roll-Coupling
where the aircraft rolls
when there is Rudder input. The mixer causes the
Ailerons to move just a little bit in the opposite
direction of the Rudder in order to keep the aircraft
from rolling, while holding Rudder for knife-edge
flight. This standard mixer would designate the
Rudder as the Master and the Ailerons as the Slave.
•
Eliminate Pitch-Coupling
where the aircraft
pitches to the gear or canopy when holding Rudder
for knife-edge flight. The mixer causes the Elevator
to move a little when Rudder is applied to keep
the aircraft from pitching while holding Rudder
during knife-edge flight. This Multi-Point mixer
would designate the Rudder as the Master and the
Elevator as the slave. A Multi-Point mixer would
be used because pitch-coupling is typically non-
linear in nature and requires a customized curve to
counteract pitching induced by different amounts
of Rudder deflection.
•
Eliminate pulling out on down lines
where
the aircraft has a tendency to pull out towards the
canopy when flying vertical down lines at idle.
The mixer generates a bit of down Elevator when
the throttle stick is pulled back to idle, making the
aircraft track straight down with no input from the
pilot. This mixer would designate the Throttle as
the Master and the Elevator as the Slave and would
be turned on and off with a switch so the down
Elevator would not be generated during landing.
•
Controlling a Smoke System
where a switch
activates a smoke system. The smoke system
comes on when the throttle stick is advanced
beyond a certain point. This standard mixer would
designate Throttle as the Master and an Auxiliary
channel as a slave and would be turned on and off
by a switch.
•
Idle-Up
where flipping a switch causes the engine
rpm to increase a bit at idle to protect against a
flameout during flying, then return to low idle for
landing. This standard mixer would designate an
auxiliary channel as the Master and the Throttle
channel as the Slave. It would also use a switch to
turn the mixer on and off.
The possibilities are endless and limited only by the
imagination.
Perhaps the best way to describe a Programmable
Mixer is by example. The example below demonstrates
a program mix for an aircraft that pulls out or pitches
towards the canopy when trying to fly a vertical down line
at idle. If a mix is set up to provide a couple of degrees of
down Elevator when at idle, the aircraft will track straight
down without input from the pilot. Once the throttle is
advanced above idle, the mixer is turned off and the down
Elevator is removed. The mixer can also be turned off so
the down Elevator input does not occur during landing.
This mixer uses the Throttle as the Master and the
Elevator as the Slave. The mix is turned on and off with
the GEAR switch in combination with the position of the
throttle stick – ON at idle and OFF above idle with the
GEAR switch ON. When the GEAR switch is OFF, the mixer
is turned off regardless of throttle setting.
The Mix parameters will be selected and set in the
following order: Program Mix number, Master, Slave,
Switch, Travel/Direction, and Offset. This is generally a
good sequence to follow when setting up Programmable
Mixers.
1.
Program Mix Number
. Highlight and select one of
the Standard Programmable Mixers (
PROG.MIX3 -
PROG.MIX6
) to obtain the first Programmable Mix
display. Then press
ACT
next to
CLR
or highlight
and select
INH
to obtain the main mix display. The
example uses
PROG.MIX3
.
2.
Select Master
. All Programmable Mixers default
to Throttle as both the Master and the Slave
(
THRO
THRO
). The first
THRO
is the Master and
the 2nd
THRO
represents the Slave.
Highlight and select the first THRO to the left of the
arrow to obtain a list of channels that can be used as
the Master. Highlight and select the
#THR
channel as
the Master, bypassing any throttle curve settings. This
causes the physical position of the throttle stick to
control the mixer.
3.
Select Slave
. Highlight and select
THRO
to the
right of the arrow to obtain a list of channels that can
be used as the Slave. Highlight and select
ELEV
as
the Slave.
4.
Select Switch
. Scroll down, highlight, and select
GER
as the switch that turns the mixer on and off. The
GER
indicator should appear in the upper or
Pos1
position at the bottom of the display. You can use any
of the switches along the bottom of the display as well
as multiple switches. The example is using only the
Gear switch.
5.
Select Switch Position
. Move the Gear switch back
and forth while observing the number directly to the
right of the Program Mix Name in the upper left hand
corner of the display. The number will change from 0
to 1 as the switch is moved back and forth. When the
number is 0, the mixer is looking at the
Pos0
values
(not programmed yet) and when it is a 1, it is looking
at the
Pos1
values (also not programmed yet).
Put the switch in the position that turns the mixer
ON. Look at the number directly to the right of the
Program Mix Name. If it is 0, highlight and select
Pos0
on the display. If it is 1, highlight and select
Pos1
on the display. The example shows
Pos0
as the
position to turn the mixer ON.
6.
Travel and Direction
. With the switch still in the
ON
position, move the throttle stick to the full low
position and the lower value next to the selected
position should be highlighted. Set the lower position
parameter to a low positive value like +3%. This is the
amount of deflection of the Elevator (Slave channel)
occurring when the mixer is turned on and the throttle
is reduced to idle, or just enough to see a little down
elevator deflection.
Summary of Contents for X9503 2.4
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