A bit late but maybe it`ll help.. 2. This is the biggest problem with spaceplane construction and this is why: In normal flight, you can balance your plane by shifting weight but hypersonic flight requires "lift balance" because the faster you go, the more lift your wings create and it basically overpowers all the balance that worked at lower speeds. Do this and you`ll see exactly what I mean: - Remove all wings and control surfaces - Complete your fuselage - Place your elevator (lift arrow will shift to elevator side) - Place another elevator or small wing to the other side of the CG (now the lift arrow should be exactly over your CG) - Place your main wings (keep the lift arrow over your CG), done. This will give you perfect balance at any speed but you don`t have to use 3 wings to make this work, just remember, you need "equal lift in front and back of your CG". Last but not least, use an "equal fuel draw mod".
