Calculate your model’s CG the full-scale way

In this how-to, Martin Zeller shares how to precisely calculate your model’s center of gravity. He writes, “I recently finished a scratch built, ¼ scale, WACO UPF-7.  The ship was 38 lbs with 16 sq ft of wing area.  It is a difficult maneuver to pick up a large aircraft like this to determine the center of gravity.  In addition, with a biplane, the required CG can be ahead of the lower wing leading edge, out in space. There is no ideal location to hold and lift it so I decided that the best approach would be to use the full scale technique.”