I remember that time well Patrick as the flying wing was developed. The small gliders I have shown really require very little up draft to stay aloft. The wind was barely perceptable and they were flying these gliders back and forth off the cliff. I kept expecting one to lose its lift and head down into the valley but they never did.
modern extreme designs require computer input as no human is fast enough. Many aircraft are aerodynamically unstable and require constant small inputs. The pilot uses control input to point the A/C and the computer keeps it on course. This is why the first flying wings were not successful.