Bill,

I'll answer as best I can... have a couple of the planes and love the way they fly.

Probably a 4" arm for the pull-pull works well. I had that originally but recently on both switched and run two servos (JR 8711's) in the tail instead. Pull-Pull wires are setup well straight as opposed to crossed.

I use 1 1/2" arms for the elevators and 1 1/4 for the ailerons. Can get plenty of throw on both... probably 35 degrees or so on the ailerons and 45 degrees on the elevators with this setup and have the control horns about 1" out.

Hope that helps... I'm sure Tom will chime in and give his thoughts as well.

Gerry