I have question about balancing the SIG Four Star 40. I haven’t seen this question posted before, but if this is redundant just point me to where I need to go.

Using my Great Planes CG Machine I balance this plane perfectly. I had the plane in the CG machine so that the landing gear was pointing up and pivot points of the CG machine right on the center of the main spar on the wing. I was very proud of the job that I did balancing this plan.

When I took the Four Star to the field it was obviously tail heavy and the pitch control was extremely sensitive. Some how I lucked out and was able to get it back to the ground with only minimal damage.

I now have the Four Star repaired and am ready to balance it again.

I was wondering if some of you experts could tell me where I went wrong in balancing this plane.
The Four Star has +1/2° incidence on the wing and I was wounding if by placing the plane on the CG machine upside is what caused the error.

If some one has some Ideas I would like to hear them.

Thanks,

Mike