I just completed a H9 SuperStick 40 size, with a Tower .46 (which will not stop running when carb is closed, but that's another topic). The CG is indicated as 1/8" behind the main wing spar. When I use what I think is the correct spot, plane is tail heavy, even with a heaver spinner (3 oz) on the engine, and battery (1100 mah) forward up against the fuel tank. Can anyone tell me the CG for this plane as measured from the leading edge of the wing, so I can see if I marked the correct spot.

Thanks for your help.

According to the manual, the CG should be 3.5 to 4 inches behind the leading edge of the wing.

Thanks GBR2, I checked again and my manual only states the 1/8" behind main spar, not the 3.5-4.0 inches. That helped alot and made much more sense compared to what I was expecting.