Guys help, after welding the parts are shifted center of mass and aerodynamic overlay, even if you do not use the wings the center of mass is still shifted.
The strenght parameters were changed before welding the parts, the result is the same.
https://drive.google.com/open?id=0B6lnx7eziENzUk5IbzhlTXROSTA
https://drive.google.com/open?id=0B6lnx7eziENzOFdySktZaExscmc
https://drive.google.com/open?id=0B6lnx7eziENzU01RaUl1ODNGdWM