RE: 25cc trainer plane
Brueblue,
You might want to also consider a 1.20 size stick like the Hangar 9 Ultra Stick light. I have a G-23 in the old heavier ultra stick and it flies well. The other advantage is that the engine is fully exposed and if this is your first gas engine it's just that much easier to adjust. If you do consider a stick, you can install the elevator and rudder servos in the rear for balancing with a heavy gasser up front. It's pretty easy.
Marty