Hello Von Ohain
I have been flying my Flying Wing for about one year. The motor thrust is as close to being on center as possible. I would move it up at least 1/2 inch, for more prop-to-ground clearance, on my next one. Mine could have used a little more power. Occasionally it would stall at the top of a loop. Since it was not very acrobatic, and would occasionally nose over on landing I recently converted it to a twin boom pusher plane. Search for a Center of Gravity Calculator for a Flying Wing. I have seen MANY flying wings crash on the first flight because of the CG being wrong. I put landing gear on mine to minimize that.