Piper,

I would say the primary reason to use epoxy on tail feathers is cure time. You need the time to get the tail assembly set square before the glue sets up.

While I agree epoxy is a better adhesive for this, I wouldn't run out and buy epoxy if I only had CA at the house. I think its more important to ask what kind of break it is. If its a clean break, the no matter what kind of adhesive you use, you want to avoid just doing a butt joint where the two pieces join back together end to end or similar. Some kind of strip or triangle needs to be glued alongside to provide additional surface area for adhesion and extra strength. This repair can be done with CA just as well as epoxy if approached correctly.

Also almost forgot to mention that you should always be very careful trimming back the covering prior to installing the tail feathers on the plane. If you use an exacto and press too hard, you are cutting the wood very slightly and reducing its strength.

Duke