A high altitude balloon launched RC plane

In a clever variation on the amateur high altitude balloon project, David Windestål of Sweden flew a radio controlled glider on a balloon to 30 km. He was able to direct the plane (to some extent) back to earth after it separated from the balloon and fell to an elevation where it became controllable: Build Your Own DIY Space Plane – Popular Science.

Here are details of the project: FPV to Space and back – RC Explorer

And a video: