It appears that this 3D thing definitely has an impact on engine selection. I have no idea what 3D is. I see guys at the field using their planes like helicopters which is of no interest to me. I fly a Senior Kadet (newbie)and the Ultimate was to be my 2nd r/c plane. I want to sport fly the Ultimate, gain some experience around the patch, as you say, so some loops and rolls in that type aircraft and pratice landings in something more than a floater. Now, based on what I have just described, will the OS .61 FX do the job for me or not? If I'm understanding Mutiflyer correctly, the .61 should at least accomplish that.

I would appreciate futher comment and I thank you guys for taking the time to answer my post.