Although the Futaba T6EX transmitter only provides two programmable mixers you can use the integrated V-TAIL mixer together with a change of stickmode to get a fully operational differential thrust setup.
Here's a step by step guide:
Activate the V-TAIL-mixer, set the mix-ratio of Ch2 (Elevator) to 50% and Ch4 (Rudder) to 75%.
Reverse Ch2 (Elevator)
Change to stickmode 1 if you normally use stickmode 2
Now the differential thrust is already in operation. The rest of the programming work is needed to get back the original rudder function and add some comfort and safety.
Setup the PMix1 to mix Ch4 (Rudder) by 100% to Ch6 as an AUX-channel with neutral position defined by FlapTrim and assign this to Ch5-switch
Setup the PMix2 to mix Ch4 by -100% on itself and assign this to the FLAPS-switch. By this means you created an ON/OFF switch for differential thrust
Create a "normal" and "aggressive" mode for rudder input to differential thrust
Set the failsafe value that now applies to the elevator to 50%
Receiver wiring is now a bit different
Check everything without props!
Differential thrust is activated by FLAPS-switch, rudder is activated by Ch5-switch, dual-rate switch sets normal or aggressive mode.
I hope everything was clear enough to try it on your own transmitter. I'm not quite sure whether this can be done on other simple transmitters.
What I found out is that it's crucial to program PMix1 and PMix2 in that exact order and to reverse channel 2 instead of channel 4. Otherwise motors have to be exchanged left and right and ESC-signal is inverted with regard to throttle stick movement.
Have fun and please leave a comment
Martin
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