This is a video from David Windestål, the creator of RCExplorer.se. David conducted an interesting RC flight involving a remote controlled glider attached to a weather balloon. The flight mission was for the balloon to carry the glider to edge of space, release it, and he would glide it back to earth.
It didn’t quite go as planned but I would call it a success for sure. He ended up with some great footage. You can read all about it on his web site here.
Total flight time was 108 minutes. Total distance between launch and landing site was 101km.