There's nothing wrong with twice the size engine. I fly the Hangar 9 Mustang (60) with the pumped OS 120. You can never have enough power until it starts messing with your wing loading as far as I'm concerned. (i.e. putting a 200 on a 40 size).......I think my next Mustang (60) as a sister plane to my current one will be highly modified before construction begins and include a YS 160 DZ for power to be the scale equivalent to this...............