I did reply to another member on how to set up the FS-i6s for dual motor control and repeat the post:
Finally found some time to write up the procedure to program the FlySkyi6. Hopefully this will help you decide a way forward to control your twin props. The percentages I have used in the mix functions are more for guidance than hard and fast rules as different models and motors will benefit from some fine tuning.
FlySky Fsi6 – Using Mixing functions
Before commencing set your Tx to the settings I had on my TX
Model – I suggest selecting a spare model and naming it Mixing until you are happy with the settings
Type – Airplane or Glider
RX setup – settings suitable for your equipment ie it will not affect the mixer
Trainer mode – off
Student mode – off
Sticks mode- Mode 2
Reverse – all normal
End Points -all 100%
Display – Select this to see the individual channel out puts and the effect of Chanel 1 via the mixer on channel 3 and 5.
Aux channels Channel 5 – none
Subtrim – all centered
Dual Rate – Ch1 Normal Rate 100% exp 0
Throttle Curve – Normal L 0% 1 25% 2 50% 3 75% H 100%
Mix – this will link channel 3 and 5 and mix Channel 1 with channel 3 and 5
Mix#1 – On Master Ch3 Slave Ch5 Pos mix 100% Neg mix 100% Offset 0%
Mix#2 - On Master Ch1 Slave Ch3 Pos mix 50% Neg mix 50% Offset 0%
Mix#3 - On Master Ch1 Slave Ch5 Pos mix -50% Neg mix -50% Offset 0%
Elevon – Off
V Tail – Off
Switches Assign – not important
Throttle Hold – Off.
I am assuming owners of the i6 are familiar with the use of the buttons to operate the menu. I will mention for anyone new to the set that you need to save the settings on each screen by pressing and holding the Cancel button until the display changes. Yes the Cancel button. Took me a while to understand this logic when I first got the TX.
Have fun and boldly go