Order Numbers
F4090 - F4091 - F4092
F4095 - F4096 - F4097
9.3 Assignment of external switches and mix trimmers (GLID)
The assignment of the external mixer switches and mix trimmers
varies according to the selected model type.
Switch assignment for Glider program:
1 = V-mix 1
2 = V-mix 2 / aileron-flap mixer
3 = V-mix 3 / trim menu 2
4 = Dual Rates (D/R)
5 = Throttle cut (TCUT)
6 = Combi-switch (AI>R)
7 = Aileron differential (DIFF)
8 = Trim menu 1 (TRIM 1)
Mix trimmer assignment for Glider program:
1 = Mixer ratio, V-Mix 1
2 = Mixer ratio, V-Mix 2
3 = Mixer ratio, V-Mix 3
4 = Aileron differential input
5 = Mixer ratio, V-tail, elevator
6 = Mixer ratio, V-tail, rudder
7 = Mixer ratio flap - elevator
8 = Unused
9.4 Combi-mixer (AI>R)
The software of the FX-18 includes a
pre-programmed aileron - rudder
compensation mixer which can be
switched on and off in flight. The
mixer couples the ailerons and rudder
in such a way that only one stick
needs to be operated when flying a
turn. This is especially useful when flying large model gliders, since
the negative roll moment (adverse yaw) of the model works against
the ailerons when the model is turning.
Automatic rudder compensation can eliminate this effect. This
mixer function is similar to the V-MIX linking mixers: part of the
aileron signal is passed to the rudder channel, and at the same time
the rudder stick retains full control of its own function.
Coupled rudder can be an embarrassment on the landing appro-
ach and in some other manoeuvres, so this option can be switched
on and off in flight by means of a switch connected to socket 6.
-
Move to the "AI>R" display in the Select menu.
-
Press the 3-D hotkey; "%" flashes.
-
Press the "S" button; "INH" flashes.
-
Turn the 3-D hotkey to the left, the display switches to "ON", the
mixer is activated; it can be switched "OFF" by means of an exter-
nal switch.
-
Press the "S" button again; "%" flashes.
-
Turn the 3-D hotkey, and you can set the mixer value you wish to
use; the default setting is 50%, which is a good starting point.
-
Check that the rudder moves to the right when you give a "right
aileron" command (right aileron up).
-
If that is not the case, turn the 3-D hotkey left to set a negative
mixer value of -50%. Check the function again.
-
Hold the 3-D hotkey pressed in for 1 second to revert to the
default value of 50%.
9.5 Wing mixers (WING)
The software of the FX-18 includes a very convenient wing flap
mixer.
This function can be used on the one hand to mix two separate
aileron servos with variable differential travel, and also, as an
option, to set the ailerons to rise together as a landing aid.This func-
tion is usually termed a flaperon (= flap + aileron) mixer.
The following flow chart is intended to help you find your way
around the program.
Explanation of terms
Since the mixer inputs for the wing flap travels can be set separate-
ly for "up" and "down", the ailerons can be used for several func-
tions; their function varies according to the flap travel:
-
Large deflection up
-> spoilers
-
Small deflection up
-> speed flaps for high-speed flying
-
Large deflection down -> landing flaps
-
Small deflection down -> camber-changing flaps for
thermalling
It is possible to program the wing flap deflection in the same direc-
tion for both sides of centre; for example: large "up" deflection as
spoilers, at the other extreme only slight "up" as speed flight trim.
This wing mixer is ideal for use in speed tasks and for thermal-hun-
ting with an electric-powered hot-line model.
To help you understand and emulate the following adjust-
ments, we recommend that you set up a model with two aileron
servos (sockets 1 and 5), and observe the effects of the mixer
on the model.
For the following description the 2nd aileron must initially be chan-
ged from channel 7 to channel 5 (see Section 9.5.3).
9.5.1 Selecting the transmitter control for flaperons /
camber-changing flaps
In this sub-menu you determine which transmitter control (MAS-
TER) is used to operate the flaperon mixer (landing / camber-chan-
ging flaps). As alternatives to channel "3" (throttle channel) you can
choose a linear slider connected to channel "5" or a switch.
- Move to the Select menu "WING".
- Press the 3-D hotkey, and "FUNC"
appears. The default setting is
that the transmitter control (MAS 5)
operates the flaps (SLV 5),
which can be seen from the arrows
above and below the number 5 on the screen.
-
If you wish to control the flaps with the throttle stick, turn the
3-D hotkey to the left, and the screen display changes to
"MAS 3".
In effect you have swapped over functions 3 and 5.
Note:
since both the landing / camber-changing flap function
(WING menu) and also the Butterfly function (BUTT) can be assig-
ned to the throttle channel, check that both functions are not assig-
ned to the throttle stick at the same time.
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