I've read several different post concerning setting the CG. I don't understand how the CG would be different upright or inverted, at the fuse or at the wing tip. If the measurement is the amount of weight on either side of the x (fuse) or y (wing) axis would it be the same at the same points along that axis? That should hold true whether the point say 30% is at the axis or 5 feet perpendicular to the axis. I do agree if the majority of the whole weight is below the measuring point a pendulum affect will make it easier to balance but the point of CG should be the same upright or inverted. Let me know if I'm missing some thing.

Suppose you wanted to balance a coat hanger...

Would it be easier to do while hanging from a rod by it's hook, or balancing on top of the rod?

If you balance a low wing plane while it's upright, it is top heavy, so the top wants to rotate to the bottom. It can still be done, it's just easier the other way.

On constant chord wings you're right weather you measure CG from Tip or fuse does not matter however with a tapered wing the measurment given from the fusalege is more accurate since the width (chord) changes as you move out towards the tip..

At least thats what I was told way back when....

Sounds like you have it.

constant cord all is the same,not so on a swept or tapered wing,some plans give both measurments,fuse or tips.The c/g is the same in the upright or inverted position,but its a lot harder to find or set the c/g when the weight is above the support,try balancing a nail on the tip of your finger,then try holding the nail pointing down

Hey troops: I think you will find a difference between center of gravity & balance point.Right? big max 1935

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