Tutorials : How to Vary Combi Mix (During Flight)
Revised 22 Jan 2002 - Multimix solution removed.
Revised 23 Jan 2003 - Added 'using a pure aileron signal'.
The mc4000 allows many parameters e.g. Differential, Exp, Travel to be set independently for each flight mode. Unfortunately this does not apply to Combi which can only be a preset value, or OFF.
This article shows a workaround, which allows the amount of combi to be varied via a flight mode (or other) switch.
Overview of solution
The solution uses a servomix instead of the built-in Combi:
Servomix "my_combi" |
--------------- Aileron (T1-1) --> | | Aileron (T1-2) --> | Servomix | Aileron (T1-3) --> | "MY_COMBI" |--> Rudder Servo Rudder ---> | | --------------- |
There are three aileron inputs, of which only one is active. The servomix mixes the active aileron input and with the rudder signal. The output signal drives the rudder servo.
Mixer set up
Mixer set up | |||
Input # | Control/Mixer | Switch | Curve |
1 | AILERON | T1-1 | -x/0/x |
2 | AILERON | T1-2 | -y/0/y |
3 | AILERON | T1-3 | -z/0/z |
4 | RUDDER | ON | -100/0/100 |
Notes:
|
Procedures
Menu/Screen | Action |
Assign Control | Assign C = Aileron, A = Rudder |
Assign Switches | Assign T1 = 3-position switch |
Assign Servo | Assign Servo 1 = Servomix |
Assign Mixer | Set inputs for servomix as in table above |
Servo Travel | Set curves and switches for Servo 1 as in table above. Repeat for all four inputs. |
Variations
For trimming purposes, have a single aileron input which is continuously variable on a slider. To do this, set one aileron input and use an analogue switch on F.
Input # | Control/Mixer | Switch | Curve | Comment |
1 | AILERON | A6/F | -max/0/max | Slider F attenuates max |
2 | RUDDER | ON | -100/0/100 |