sorry i didnt see you were using an eq-10 i am using that new ar9100 its very cool only thing about it is i have to file just a hair off the servo connectors to get it to fit it is made for JR stuff [>:] i would stick with 1.5" arms all around 2" is way more then you need for the elevators and on the ailerons i have 1.5" but get plenty of throw with the next to last hole in it i am using swb also using 3" on rudder i will have to see how that pans out but i am sure it will be plenty