FUTABA FX-36 Instruction Manual page 143

(Normal)
The butterfly operation direction is reversed
at the neutral position (50) of the throttle
stick.
At offset 20
At offset 70
The direction of butterfly motion is reversed.
＜ Model menu (Airplane/Glider/Multicopter Functions) ＞
Throttle stick full stroke MODE
(Throttle stick full stroke MODE)
It does not reverse at the neutral position,
so you can set the butterfly operation start
point with the full stroke of the throttle stick.
At offset 20
At offset 70
The direction of butterfly motion is not reversed.
143