Using two JetCentral Cheetahs. The prior owner have Jetcat P100 with a single ECU battery in the nose, and other batteries in front of the cockpit,. I was waiting on the CG measure to decide where the two (2) ECU batteries should go. I did the CG measurement and even if I were two locate the two batteries in front of the vertical stabilizers (behind target CG), will still need to add about 2 pounds in the tail to achieve 15mm (midpoint 10-20 mentioned in the manual) CG
At around 62 pounds, the plane seem to be "overweight" by about 10 when compared with what the manual states. The plane do have the thrust vector system, so i do expected it will be somewhat more heavier in the tail.

I'm going to repeat the CG measure with a different system to be sure. I used a digitech digital balancer, now will use a balancing jig. However I don't imagine that a small measurement error with the digital system will result in such a big difference.

Asking about the CG being used, so that I can minimize the amount of weight needed.

Thanks!