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Recently I have been playing around with
OziExplorer's 3D profiling program, looking at some past flight tracks.
In September last year I had a very interesting flight that involved getting caught in a thermal. We took off in the afternoon, which was warm but not hot, from the paddock behind our house at Binalong for a short flight. As part of my practice for the Worlds, I was flying a Kavanagh EX65, which is designed to handle fast vertical speeds. We cruised (quite quickly) up to 3000 feet above the launch site and then leveled out. Then a strange thing happened...
Without putting much heat into the balloon, we found ourselves in a sudden rapid ascent and within a minute and a half we were at 5500 feet where it rounded out. The balloon handled the climb very well, it was more a surprise to find ourselves at that height. After a fast descent, we landed on the other side of the hill having only traveled 2km.