When I was a child, I had a book with many of these designs. I tested them all from the top of a nearby building's fire escape. My goal was always a long, slow, stable flight and I got the best results with the Square Plane and the Bird. These planes were able to glide all the way across the parking lot (about 120ft estimated using Google Earth imagery.)
I always aimed for (but rarely achieved) a long, slow, stable flight, never had anywhere high enough to test my better attempts. What I'd have given for an empty stadium to test in
