New style elevon mixing EEPROM setup (ELEVON_OUTPUT option)
As of ArduPlane 2.73 there is a new ELEVON_OUTPUT option. This option allows you to setup your transmitter for normal aileron/elevator control and for ArduPlane to add elevon mixing on the output of channels 1 and 2. Using ELEVON_OUTPUT has a big advantage over ELEVON_MIXING that your inputs won’t saturate the roll/pitch control in FBWA mode, which means you can get better control of your plane.
Note that you cannot use the ELEVON_OUTPUT option on an APM1 board if you have the flight mode channel (FLTMODE_CH) set to 8, as on the APM1 this will lead to hardware pass through of controls when in manual, which means your transmitter must be setup for elevon mixing. If using an APM2 or PX4 this is not a problem, and the ELEVON_OUTPUT option is recommended.
The ELEVON_OUTPUT option is designed to operate exactly as a hardware elevon mixer would operate. To set it up follow these steps:
Setup your transmitter with no elevon mixing
Set both RC1_REV and RC2_REV to 1 and ELEVON_MIXING to 0
Start by setting ELEVON_OUTPUT to 1. In later steps you may adjust this to 2, 3 or 4.
Put your APM into FBWA mode
Roll the plane to the right and observe what happens to the elevons
If the two elevons move in the same direction, then change ELEVON_OUTPUT to 2, and try again.
If the elevons move in opposite directions, but the APM is correcting the roll in the wrong direction (the left elevon is going down and the right one is going up) then change RC1_REV to -1
Next try pitching your plane up. If the elevons move in the wrong direction then change RC2_REV to -1
Now change to MANUAL mode and adjust your transmitter reversals for channels 1 and 2 to produce the right movement in MANUAL mode.
Please make sure that you do careful ground testing after setting these parameters!
Please also see the note about the MIXING_GAIN parameter below.
