RE: Prop Recommendation for Funtana w/FA-50
The plane is very light, and maybe the engine of your choice could make it fly just well.
I have the same plane but I use a different engine, a Saito 82, I also have seen it with a Saito 72 flying quit well.
For your engine, you should use a 12 x 6 prop.
Try that one and tell us how it did.
regards.
Alfred.