Well i didn't put the battery in the left wing cause it was not cut out for a hatch. so i slid it in the right side. I am comfortable with it there and the weight on the left side. I flew mine with the engine mounted all the way forward on the mount and it is ok. It is about 1/2 inch aft the recommended and that is fine for my 3d skills, thanks for your response. as a side note. I did use 40 size control rods for the tail gear so that is probably why mine came out tail heavy, boy did i get ragged on at my field. LOL