Finally, I start my CG at 3.7" and I finish at 3.5". At full speed it was very stable, not too sensative, but pratically impossible to land on a 250 feet runway! All test flights was finished at the end of the field in long grass with a couple of flip!.

This project was fun to build, and give me big boost of adrenaline. Maybe one day I will make some mods on it to make it flyable.
I will work now on my unfinish Enforcer, Viper 500 and Reno P51....

Thanks.