Thanks, Lnewqban, I did some playing around with my model, the Edge 540T with an OS 91Fx today and by moving the 2 batteries as far forward as they would go the model balanced at exactly 100 MM using a home made balance rig similar to the small one Tower sells. I coiuld have gone out more with the engine but then the cowling would not have fit. I have built a few models and have always put a swivel in the bottom of the fuse exactly where recommended and hung it from a ceiling hook, upside down, thus being able to balance in all directions before the plane was finished and covered. Always worked out well and never had to re balance. This is an ARF and only has ultrakote on the bottom so that couldn't be done this time. After reading page after page of posts regarding the Seagull Edge 540 like mine I realize lot of folks seem to have a different idea about what exactly is meant by CG and balancing a model. Your answer covered it very well and thanks for "agreeing" with me.