That's my shuttle. It was inspired by the Dream Chaser by Sierra Nevada, which is a new shuttle they are working on to take astronauts to the ISS, etc. I spent way too much time failing at a Discovery style shuttle with the belly tank, etc. As we've found out, it won't work with stock parts. Ascent was unstable with a bigger shuttle with bigger wings. Once I made it smaller and made the wings smaller, it was a much smoother take off. All 3 of the "shuttle" fuel tanks are nearly full once in orbit, so there's plenty of juice left for whatever maneuvers you may need to do.