I had a friend who had a fuel 46 on a first edition Uproar and had flutter problems with it. I ran a Tower 40 on mine and think a performance 40 was about max for it. Since the electrics you mention are more like the performance fuel equivalents I would think the 46 is way overpowering it. That plane was designed for a 30 size engine for fun fly's. I think you will find the Rimfire 32 will give you the thrill you are looking for. I saw a guy with the predecessor original design from Huntsville do 8 foot loops and 3 rolls per second with a 32.