I think this worked for me (in CLI), Had to do a custom wing. It has differential for yaw control.
#mixing motors
#motor Motor Thr Roll Pitch Yaw
mmix reset
mmix 0 1 0 0 0.3
mmix 1 1 0 0 -0.3
# sero Mixing
# Rule Servo Source Rate Speed Min Max Box
smix reset
# predifined pitch
Smix 0 3 10 100 0 0 100 0
Smix 1 4 10 100 0 0 100 0
# input pitch
Smix 2 3 1 100 0 0 100 0
Smix 3 4 1 100 0 0 100 0
# Input roll
Smix 4 3 0 100 0 0 100 0
Smix 5 4 0 -100 0 0 100 0
Thanks timOD
I've been playing with the whole 2 motor wing thing in Betaflight an i think I've found the solution.
As a bit of background im looking to use a brushed F3 evo
https://uk.gearbest.com/multi-rotor-parts/pp_569074.html to create a mini foamboard wing.
I would use Inav but wanted to use the resource mapping ability of Betaflight to assign servo output to physical pins rather than do a solder hack on the esc header.
OK cutting to the chase the way I've found to get the 2 motor option Wing working is as follows:
* Do a fresh flash of Betaflight firmware with the SPracing evo target in this instance ensuring full chip erase is set
* Set the mixer in the Configuration tab to be WING and click save & reboot
* Once reboot has done (you may need to un-plug and plug back in the usb) go to CLI and type DUMP and press enter
* Copy the contents of the CLI to a text file on your desktop
* In the text file find the Mixer: WING line and replace the whole line with "Mixer: CUSTOMAIRPLANE"
* Save the text file and then copy and paste the entire CLI dump from the text file back to the CLI in Betaflight and press enter.
* Once the text has copied in type "save" and press enter.
* BINGO!!!! Once reboot has done (you may need to un-plug and plug back in the usb) the mixer tab will say "Mixer: CUSTOMAIRPLANE" but all other settings relate to the wing and both motors will be running!
I've yet to test this for the resource mapping of servos but ill keep you posted!