When I had mine,I had a 120 os surpass up front.I totalled the plane on an inverted flat spin to the runway.my mistake,the plane was great.But I would not power it with anything less.No experience with the 108,but would use it if that's the most powerful engine you have.This was a long time ago and I built the plane with a single servo driving all 4 ailerons.dont do this mistake if the kit/plans call for this set up.Put one in each lower wing half.