RE: Funtana 90 CG
I think I'm at 6 1/4" and it could still go a little more forward.... I orginally set it up at 7" and that was way too tail heavy....it always wanted to climb and landing it was interesting...don't be afraid to go farther forward with it, I'll most likely try 6" and see how that feels once the weather gets better.
I have a YS 110 on it and my 6V battery and 6 ounces of lead are mounted on the engine box for my CG.... I'm thinking of going to a pull-pull so the rudder servo will be closer to the CG, i have hitec 645's on the elevators that weigh a little over 2 ounces and I'm thinking of getting JR 125mg's which will save me another ounce from the tail...it's a little over 9 lbs and if I put it on a diet I should get it down to 8 1/2 lbs and only spend $65-70 for it.
My other option is to mount my YS 140L that weighs 32 ounces and get rid of the dead weight and that will allow me to use the battery to adjust the CG