I was taking my first flying lessons and was really looking forward to it, after 2 flights and 2 amazing saves by two instructors we all decieded to see why the plane flew so terrible. It was, much to my embarrassment, my fault. I had added 2 oz of lead weight on the left wing tip for laterial balance. When I balanced it at home I had my wife place a single finger under the tail and I held the prop and as God is my witness the right wing continued to drop until I at last had added 2 oz of lead to the left wing tip. The wings were then perfectly level. Now lo and behold when doing the same thing at the field the left wing with the 2 oz of lead dropped like it had 2 lbs of lead on it. The wing were centered perfectly at home so what happened? I have a lot of experience in building and the only thing I can thing of is my wife must have been holding the plane wrong although she swears she did just as she was told-should I ever trust her again?