Originally Posted by wings19
In most 40% aircraft 2 servos is enough. However, I'm putting together a 125" Extreme Flight Extra where it is strongly recommended to use 3 servos due to the size of the ailerons. This thing has pretty huge wings. I'm flying it for IMAC also so I want crisp snaps.
The assembly manual instructs you to use three on the ailerons. The trailing edge is thin on the EF Extra. At first I only installed two however I did not fly it that way and after looking at it and moving the ailerons I installed the third. There is no problem with the power of three.