Through The Fuselage
According to the plans for my Jungmeister, the precise CG was indicated at a point on the fuselage a little ahead of the aft cabane strut. Since this is a staggered "swept-wing" biplane, I got a little suspicious about which point was more accurate:
Project the CG straight up to the upper wing and balance from there?
Or thread a stout wire through the fuselage at the specified CG and balance from that point?
In carrying out both methods, I noticed that during initial calculating, if I balanced from the upper wing, the tail didn't drop so much. When I balanced from the wire in the fuselage, the tail dropped more. I figured the balance point in the fuse must be the most accurate of the two. The reason why I chose this way was because I was concerned the "pendulum effect" may not give a true reading. Plus, I was not only concerned about "center of gravity" but I was also equally concerned about "center of lift" with a staggered and swept-wing biplane! There has to be a separation point, right?! Or perhaps a correlation...? Just something to consider, that's all.
Ted