Wow, now things are starting to get interesting. Soooo if I want to fly both 3D and IMAC I got to live with a compromise CG. Right now my plane is set up for 3D, which it does well. If I want to optimize my IMAC flying I need to set my plane up with two different battery locations (which I already have) and get some weight forward for IMAC flying. I'll try it this weekend and see if it helps the spin entry. As I stated in another thread I have a 28% Extra I'm setting up for 3D. Now I guess I know why a guy at our field last winter had two planes. One he always flew 3D with and one he flew IMAC with. Never got around to asking him why. Thanks.