What you see on the website is a classic "Zagi launch." Hold the plane up over your head, palm up with your thumb over the leading edge of the wing. It may take some practice, but you simply throttle up and sling the airplane straight ahead, releasing your thumb and following through.

It helps to be left-handed, or to learn to sling your plane with your left hand. This way, you keep your right thumb on the stick that controls the plane.

If the plane is squirrelly, try reducing the control throws, or moving the CG ahead a little.