Tutorials : Setting up Aileron Diff
For the Aileron Differential control adjustment to work properly, the wing servos must be assigned alternately left/right/left/right (or right/left/right etc.) as you ascend the channel numbers.
Note, the actual channel numbers are not important. The only restriction is the alternate L/R ordering as you ascend the wing servo channels.
Here are three examples for a 6-servo wing showing the channel assignments:
This is OK:
1 L ail 3 R ail 4 L flap 5 R flap 7 L tiplet 9 R tiplet
This is also OK:
1 L ail 3 R flap 4 L flap 5 R tiplet 7 L tiplet 9 R aileron
... but the following is not OK since there are adjacent pairs of L's and R's
1 L flap
3 L ail
5 R ail
6 R flap
7 L tiplet
9 R tiplet