Noodles:

To simplify, you are correct about how ailerons work.

Dual Aileron servo setup provides one servo for each side, and can be controlled by either one RX slot as it is now, or two slots with a computer radio and following the selection in your radio manual for dual aileron servo's, usually "flaperon" setup, but it is different on various types of radio systems.

Basically, each servo will control it's own aileron. The mechanical setup for this requires that the servo arm is on either the outside of both servo's or the inside of both servo's. You cannot have, for instance, the left servo arm on the outside or pointing out to the tip of the wing, and the other point in towards the fuselage. This will make both ailerons go in the same direction, both up or both down.

Anyway, for training purposes, the single centered servo as is on the NexSTAR, and most other trainers that I know, is more than adequate. You will not see any differences, other than more cost for the extra servo and a tad more complexity in the construction, with dual aileron servo's versus the single centered servo.

There are several benefits with dual aileron servos, but most of them are well beyond the training level. They provide for individual aileron setups for trim and centering, as well as for operation of 'flaperons'. Flaperons are just that.. flaps (for adding additional lift) and aileron operation both at the same time. One disadvantage of flaperons is that when the flaps are deployed, you will loose that much more aileron control for the side that must go down because the flap selection switch has caused the system to pull both the ailerons down (both sides are deflected down), so when you apply the aileron control for the side that must go down, well, it can only move so far and that's that, so you loose some aileron control when you probably need it most, during landing.

This is usually overcome by experience and you learn how to cope with it, but not desirable for someone in training, especially in your situation where you are trying to learn by yourself. You will have enough brain load as it is without trying to learn how to control a system with dual aileron servo's and flaps.

Now, this is not true when you use a Y connector to one RX channel. In that case, the ailerons simply operate as ailerons without flaps. In that case, the only benefit to having dual aileron servo's is that you have more torque... each servo's torque is dedicated to that side's aileron. There is no additional adjustment provided because whatever you do to one side, using the computer features, you will do to the other side.

Hope all this stuff (everyone's postings) helps you out.

DS.