I have the plane with an OS .91 FS and (if I recall correctly) a 15x4W prop. It flies great, but will not do 3D due to a lack of aileron authority. With my prop / engine setup it will hover, just barely, with nothing left to pull out. It flies plenty fast (for what it is) with this setup.

That said, it is a great sport flier, lots of fun, and capable of some huge aerobatics. Oh, and it's one of the few bi-planes with thumb screws for the wing braces making assembly / dis-assembly for transport a snap. Final thought, look at the reactor bipe.