RE: Pull-Pull Rudder setup
3D,
Other servo arms work fine, I just really like having the double retention system on the SWB arms. I went with the 1 1/2" arms just because I went "overkill" on the servos (HT-5985s at 6V) and wanted the extreme throws. 1 1/4" arms will work fine also. I didn't use the control horns that came with the plane, I used Dubro HD horns, I prefer them on the big planes. My rudder horns are 4" apart, but the crossed cables gave me better throws without any binding or rubbing. I am contemplating buying another YAK just to have in the closet in case I screw this one up. It is by far the best flying plane I own! 16lbs even!
Tim