RE: ParkZone J-3 Cub Electric 3ch Beginner ?
Sounds like you might be getting radio interference. Since both the Cub and Super D are on 27 mhz, any interference on that freqency would cause problems with both planes. I presume that your wife included a new radio system for your mini-edge. Before flying the mini, try putting the new components into the Super D. If the plane still has problems, you'll know that it wasn't the radio. If it flies well, you can practice with it until you get better, and then move up to the mini. Either way you win.