Outdoorhunter,

I have built two Chipmunks in the past and loved them both, great flying planes. The mods I made were to the second one. I did the wing servos with full length ailerons (I never used the flaps on the first one). I also mounted both servos in the tail to simplify the linkage. I flew OS .61FXs in mine and was able to balance the plane with just the battery over the fuel tank. The first version used push rods from the center and I had to add tail weight.

Just my two cents...

Skydeuce