I think I got it, and it has to be using the distance at the wing tips.

I used an online calculator and it said to have CG at 3 7/8 inches at the root. Which is exactly where it would be using the 2.2 at the wingtips. A friend has the QQ Brio 10, which is close to the same size etc. and his instructions say 3 7/8 at the root.

It takes 6 ounces of lead to get it even close to balanced at 2.2 inches at the root. On a 20 ounce plane I think this would not work. But it only takes 3/4 ounce to make it slightly noseheavy if I use the 3 7/8 that the calculator gives. And the 1/4 inch extension of the motor wouldn't make up for 6 ounces.


So If the weather clears, I'll try it and hope for the best. It's just a pain when the instructions are not very clear (made in the Far East) , and the Vendor is not available to give advice. Probably the last order they get from me. Asssuming that they even know what the CG should be, or care if I order again.