One of the guys in our club has a 1.20 on an Uproar 60 and loves it. I think he said the engine added at least 7 ounces of weight compared to the .61 he originally had. He used a 1400 mAh receiver pack, square configuration and made a place for it near the tail. He did have to add some tail weight but not a lot. With the thick airfoil and 975 sq inches of wing area it can handle some extra weight. He also had to put on a taller landing gear.