ORIGINAL: RCKen
Even if you have 2 aileron servos they will move with the same stick input. The two servos will move opposite of each other, so when one aileron goes up the other one goes down.
While not mandatory, you will be much happy with an airplane that has ailerons.
Ken
LIKE KEN says.. Unless you set-up, Twin aileron servos to mix ( computer radio) in flaperons.They`ll move in unison,both up or down,untill you give it a directional input on your transmiter,It will immediately put one aileron up and one down.That is an advantage,but you also add the weight of an extra servo(disadvantage).I think most trainers are not setup for this system, but you may want to modify it down the road,with 2 lighter weight servos,You also need an extra chanel on your radio..In the box (kit)you`ll find a single servo Aileron system..I think the aileron system is the way to go too ........D.B.