A 61FX would be an overkill for this plane - too much weight and power for a model this size. Keep in mind also that this is a scale model and not a 3D airplane. I fly mine with an OS .46AX w/ Bisson Pitts muffler and I have just about unlimited vertical.
http://www.flickr.com/photos/brcf/3956366107/
http://www.flickr.com/photos/brcf/3956391307/