This is comical. Here we are, a select group of individuals with the mental ability and keyed reflexes great enough to control an RC aircraft, yet we question something as simple as this. Is there a set up with enough thrust to push a plane backwards? Yes. Enough to sustain and move with the weight of a plane above it? Yes. But, even with directional vectoring of the prop it would only be a balancing act to say the least. Unless the thrust was so great that it would move air from, lets say, up around the ceiling, then there is no air flow over the surfaces. Aside from the throttle, there is no control. The air is being pulled from a small pool around the nose of the plane. The air disturbance near the tail is minimal. Common sense is knocking on the door of "cabin fever" Let it in.