Electrics (EDF) fly fine on a T/W of .3. These are real models not the parkflier types. .3 will just takeoff safely from a paved surface, .5 provides good performance and easy pavement takoffs, .6-.7 with the right aerodynamics will RO short grass and give strong vertical and 120+ level flight speed. These are all for say 4 - 8 pound airplanes. A 200 + pound monster will have scale effects on its side, I suspect .5 will be a very enjoyable model to fly.